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SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM (making metal-coated products by extruding metal B21C 23/22 ; building up linings or coverings by casting B22D 19/08 ; casting by dipping B22D 23/04 ; manufacture of composite layers by sintering metal powder B22F 7/00 ; arrangements on machine tools for copying or controlling B23Q; covering metals or covering materials with metals, not otherwise provided for C23C; burners F23D)
Definition statement
This subclass/group covers:

Machines, devices or processes for specific methods of soldering, welding, cladding or plating by soldering or welding, cutting by applying heat locally or working by laser beam (B23K 1/00-B23K 26/00).

Welding or cutting machines, devices or processes not covered by any of the preceding groups (B23K 28/00).

Soldering, welding or cutting processes specially adapted for particular articles or purposes (B23K 31/00).

Specially-profiled edge portions of workpieces for making soldering or welding connections and filling the seams formed thereby (B23K 33/00).

Rods, electrodes, materials or media for use in soldering, welding or cutting (B23K 35/00).

Auxiliary devices or processes, not specially adapted to a soldering, welding or cutting procedure covered by only one of the preceding main groups (B23K 37/00).

Informative references
Attention is drawn to the following places, which may be of interest for search:

Making metal-coated products by extruding metal

Building up linings or coverings by casting

Casting by dipping

Manufacture of composite layers by sintering metal powder

Metal-working machines other than soldering, welding, or flame-cutting machines; Arrangements on machine tools other than tools for soldering, welding, or flame-cutting for copying or controllingGuiding means applicable to metal-working machines other than soldering, welding, or flame-cutting machines.

Cutting in general

Welding of plastics

Covering metals or covering materials with metals, not otherwise provided for

Burners

Special rules of classification within this subclass

Upon classifying in B23K 31/00, B23K 33/00, B23K 35/00 or B23K 37/00, the appropriate classification in B23K 1/00-B23K 26/00 or subgroups should be added, if applicable.

Soldering, e.g. brazing, or unsoldering (B23K 3/00 takes precedence; characterised only by the use of special materials or media B23K 35/00 ; dip or wave soldering in the manufacture of printed circuits H05K 3/34)
Definition statement
This subclass/group covers:

Soldering and brazing, which are processes in which two or more metal items are joined together by melting and flowing a filler metal (solder) into the joint, the filler metal having a lower melting point than the workpiece. Brazing is a form of soldering, wherein the temperatures used to melt the filler metal are above 450 °C.

Unsoldering, wherein solder is removed from a joint prior to resoldering.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Arc brazing apparatuses

Dip or wave soldering in the manufacture of printed circuits

Special rules of classification within this group

Arc soldering or brazing to be classified in B23K 9/16 and B23K 1/00.

MIG soldering or brazing to be classified in B23K 9/173 and B23K 1/00.

TIG soldering or brazing to be classified in B23K 9/167 and B23K 1/00.

Synonyms and Keywords

In patent documcuments the following expression/words"braze welding" and "arc brazing" are often used as synonyms.

Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods (materials used for soldering B23K 35/00)
Definition statement
This subclass/group covers:

Tools, devices for soldering, brazing or unsoldering.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Soldering lamps or bloworkpieceipes

Electric heating in general

Gas flame welding
Definition statement
This subclass/group covers:

Welding, where a flame is applied to the base metal and held until a small puddle of molten metal is formed with or without addition of more metal from a welding rod or filler rod into the molten metal puddle.

Cutting, scarfing, or desurfacing by applying flames{(thermal deburring B23D 79/005)}
Definition statement
This subclass/group covers:

Cutting where the flame is not intended to melt the metal, but to bring it to its ignition temperature.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Thermal deburring

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Scarfing

Also termed deseaming. It is a process for burning out defective areas on the surface of ingots or semi-finished products such as billets so that the product is suitable for subsequent rolling or forging

Desurfacing

removing surface metal by means of oxidizing gas jets

Arc welding or cutting (electro-slag welding B23K 25/00 ; welding transformers H01F ; welding generators H02K)
Definition statement
This subclass/group covers:

Welding methods and apparatus, wherein a welding power supply is used to create an electric arc between an electrode and the base material to melt the metals at the welding point.

Arc welding and cutting with direct (DC) or alternating (AC) current.

Arc welding with consumable or non-consumable electrodes.

Arc welding with or without shielding means.

Underwater arc welding.

Backing means for arc welding.

Inserts between the pieces to be joined through arc welding.

Power supply for arc welding.

Drag welding.

Submerged arc welding.

Stud welding.

Percussion welding.

Protecting means used during arc welding.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Masks, shields or hoods for welders

Electro-slag welding

Form or composition of electrodes

Welding studs

Media used during welding or cutting

Copying in general

Protective means in general

Welding transformers

Electrical coupling means

Earthing connections

Welding generators

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

TIG welding

Tungsten inert gas welding

MIG/MAG welding

Metal inert gas/metal active gas welding

SAW

Submerged arc welding

SMAW

Shielded metal arc welding

MMA

Manual metal arc welding

Stud welding

Stud welding is a form of spot welding where a bolt or specially formed nut is welded onto another metal part.

Percussion welding

Percussion welding (PEW) is a type of resistance welding that blends dissimilar metals together. Percussion welding creates a high temperature arc that is formed from a short quick electrical discharge. Immediately following the electrical discharge, pressure is applied which forges the materials together. This type of joining brings the materials together in a percussive manner.

Drag welding

known as gravity welding or gravity arc welding. It employs an electrode holder attached to an inclined bar along the length of the weld. Once started, the process continues until the electrode is spent.

Welding or cutting by means of a plasma
Definition statement
This subclass/group covers:

Plasma arc welding (PAW), wherein heat is produced between an electrode and a constricting orifice (nontransferred arc). Shielding is generally obtained from the hot, ionized gas issuing from the orifice of the constricting nozzle, which may be supplemented by an auxiliary source of shielding gas. Shielding gas may be an inert gas or a mixture of gases.

Plasma arc cutting (PAC), wherein a pilot arc is first generated between the electrode (cathode) and the nozzle (anode). The pilot arc ionizes gas passing through the nozzle exit orifice. After the ionized gas reduces the electrical resistance between the electrode and the workpiece, the arc transfers from the nozzle to the workpiece. The torch is operated in this transferred plasma arc mode, which is characterized by the conductive flow of ionized gas from the electrode to the workpiece, for the cutting of the workpiece.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Circuits for plasma torches

Resistance welding; Severing by resistance heating
Definition statement
This subclass/group covers:

Electric resistance welding, where heat to form the weld is generated by the electrical resistance (Joule effect) of material vs the time and the force used to hold the materials together during welding.

Spot and seam welding.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Brazing of honeycomb sandwich structure

Stud welding with an arc

Form or composition of electrodes

Electromagnetic counters

Welding by high-frequency current heating
Definition statement
This subclass/group covers:

Welding by conduction heating, wherein a high frequency current produces heat in a tool contacting the workpiece.

Welding by induction heating, high frequency current (called eddy current or Foucault current) is produced by induction in the workpiece and is used to heat the same.

Electron-beam welding or cutting (electron- or ion- beam tubes H01J 37/00)
Definition statement
This subclass/group covers:

Electron beam welding wherein a beam of high-velocity electrons is applied to the materials being joined.

Electron beam cutting wherein high-velocity electrons concentrated into a narrow beam are directed toward the work piece, creating heat and vaporizing the material.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Electron- or ion- beam tubes

use of the energy of nuclear particles in welding or related techniques
Definition statement
This subclass/group covers:

Welding, micromachining using an ion beam.

Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
Definition statement
This subclass/group covers:

Wire welding; Capillary welding; Ball bonding.

Isostatic pressure welding.

Thermo-compression bonding, bonding tips therefore.

Explosive welding.

Ultrasonic welding.

Friction welding; friction stir welding.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge e.g. Cold spray coating

Alumino-thermic welding
Definition statement
This subclass/group covers:

Alumino-thermic welding during which a reacting composition of iron oxide red (rust) powder and aluminium powder is ignited at high temperatures and a strongly exothermic (heat-generating) reaction occurs that produces through reduction and oxidation a white hot mass of molten iron and a slag of refractory aluminium oxide.

Welding, wherein heat is generated by an exothermic reaction other than alumino-thermic (e.g. US2007/0295782).

Slag welding, i.e. using a heated layer or mass of powder, slag, or the like in contact with the material to be joined (B23K 23/00 takes precedence; submerged-arc welding B23K 9/18)
Definition statement
This subclass/group covers:

Electroslag welding (ESW) which is a single pass welding process for thick materials in a vertical or close to vertical position wherein an electric arc is initially struck by a wire that is fed into the desired weld location, flux is added until the molten slag, reaching the tip of the electrode, extinguishes the arc upon which the wire is then continually fed through a consumable guide tube into the surfaces of the metal workpieces and the filler metal are then melted using the electrical resistance of the molten slag to cause coalescence.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Submerged arc welding (SAW)

Working by laser beam, e.g. welding, cutting, boring (lasers per se H01S 3/00 ; { laser assisted deposition C23C; laser inspection or alignment G01B; laser sintering of metallic powder B22F 3/105 , of plastics B29C 67/00 , of glass C03B 19/06 , of ceramics C04B 35/64 ; applying identification marks by laser B41M 5/24 })
Definition statement
This subclass/group covers:

Laser scribing for making a weakened layer, even without notching.

Laser shock processing.

Apparatuses for laser surface treatment.

Laser ablation except ablation for laser recording covered by G11B 7/00 or B41M 5/00 as appropriate.

References relevant to classification in this group
This subclass/group does not cover:

Laser sintering which is covered by group

Laser lift-off by applying laser at an interface through the front layer

B23K 26/0054 + B23K 26/4025 or subgroup, e.g. US2010009515

Laser bending

B23K 26/0093 + B21D 11/20 or subgroup (e.g. US2009229335)

For metallic powder, by group

Laser marking for applying identification marks

For plastics, by group

By group for ceramics

Re-melting metals

Laser assisted deposition which is covered by subclass group

Alloying

Laser assisted chemical etching which is covered by main group

Laser inspection or alignment which is covered by subclass group

Direct Laser Writing, i.e. creating small features in a photosensitive material or in a masking layer for photosenstive material

Direct laser writing systems for microlithography

Marking cable or electric conductors

Lasers per se

(electric circuits for) controlling the cavity and excitation of the cavity

Informative references
Attention is drawn to the following places, which may be of interest for search:

Electroplating using locally applied laser (e.g. galvano)

Special rules of classification within this group

Indexing Code B23K 26/00 and subgroups are not used.

Groups relating to workpiece material:

B23K 26/32 and subgroups: welding

B23K 26/40 and subgroups for cutting technique

B23K 26/0006 and subgroups: others technique

Interpretation of entry titles relating to materials B23K 26/0006, B23K 26/32, B23K 26/40 and respective subgroups:

  • Metals covers Steel, Fe, Cast iron or steel
  • Non-ferrous metals or alloys covers Si, Ge, Cu, Ni, Co, Au
  • Refractory metals or alloys covers Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W or their alloys
  • Light metals covers Li, Be, Al, Na, K, Ca, Sc, Mg, Ti, Rb, Sr, Z, Cs, Ba, Fr
  • Dissimilar metals or alloys covers processing materials of different metals, e.g. Welding of iron steel components and copper components, or welding of cast iron components and stainless steel components.
  • Organic materials covers Containing carbon, low-k, e.g. dielectric
  • Paper covers processing filter of tobacco, e.g. JP.A.S54-74592; does not cover metallic paper
  • Plastics covers e.g. resin, organic glass
  • Inorganic materials covers e.g. asbestos, SC materials, diamond
  • Ceramics including concrete; see e.g. JP.A.S61-126987
  • Composite materials materials having composite structures including laminates; e.g. Fibre reinforced materials, sandwich steel plates or vibration control steel plates
  • Surface treated material materials on which surface treatments are applied, e.g. plating, coating or painting
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Laser

Masers, lasers, X-ray lasers, gamma lasers, optical amplifiers

Synonyms and Keywords

In patent documents the following abbreviations are often used:

Multiphoton lithography

Also known as direct laser lithography or direct laser writing (DLW)

{Trimming, tuning}
Definition statement
This subclass/group covers:

Adjusting contact position; mechanical tuning (e.g. US2002070203).

References relevant to classification in this group
This subclass/group does not cover:

Laser trimming of resistors

Special rules of classification within this group

Mechanical trimming B23K 26/362.

Balancing rotating objects B23K 26/0823.

{taking account of the properties of the material involved (B23K 26/20 , B23K 26/36 take precedence)}
References relevant to classification in this group
This subclass/group does not cover:

Alloying,chemical coating or sputtering of metallic materials

Direct Laser Writing

Special rules of classification within this group

See definition of B23K 26/0066.

For titles interpretation, see B32K26/00 definition.

Cutting B23K 26/36 and subgroups.

Bonding, welding B23K 26/20 and subgroups.

Direct Laser Writing see B23K 26/00 definition.

{for surface treatment (for changing the physical structure of ferrous metals or alloys C21D, of non-ferrous metals or alloys C22F; for alloying C23C; annealing crystalline material C30B 33/02 ; laser treatment of semiconductors H01L)}
Definition statement
This subclass/group covers:

Glazing.

References relevant to classification in this group
This subclass/group does not cover:

Laser melting or weldig of glass

C03

Surface treatment of glas

For changing the physical structure of ferrous metals or alloys

Annealing metallic materials

Laser re-melting of metals by wave energy

Of non-ferrous metals or alloys

Chemical coating, alloying or chemical coating of metallic materials

Annealing non-metallic materials

Laser melting for crystallising non-metallic material

Annealing semiconductor

Special rules of classification within this group

Nanostructuring, e.g. Colouring metal, e.g. Us2008299408, B23K 26/0084.

Melting B23K 26/0081.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Annealing (F recuit, G Glühen)

process that produces conditions by heating to above the recrystallization temperature, maintaining a suitable temperature, and then cooling.

Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
Definition statement
This subclass/group covers:

Method and devices for positioning or observing the workpiece.

Aligning, aiming or focussing the laser beam by exchanging the focussing optics, e.g. WO2011004084, US5312397, JP61137382.

Relationship between large subject matter areas

Interchange of lenses in general

Optical focussing aids

Special rules of classification within this group

Nozzle exchange in B23K 26/1482.

Devices for moving the workpiece in B23K 26/08

Devices involving relative movement between laser beam and workpiece
Special rules of classification within this group

Features of workpiece holding or support member B23K 26/422 + B23K 26/08 or subgroup.

If the workpiece is immobile at the moment of being laser processed B23K 26/10.

in a special atmosphere, e.g. in an enclosure
Relationship between large subject matter areas

Selection of media, e.g. Atmosphere surrounding the haz B23K 35/38.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Reactive-ion etching

Special rules of classification within this group

With a nozzle contacting the workpiece and forming thus an enclosure see definition of B23K 26/1476.

using a flow, e.g. a jet of gas, in conjunction with the laser beam;{Nozzles therefor}(B23K 26/12 takes precedence)
Informative references
Attention is drawn to the following places, which may be of interest for search:

Ionisation of the arc gap by radiation

Special rules of classification within this group

Constructional features influencing pressure B23K 26/1441, e.g. DE9117180U.

Gas debit or speed B23K 26/1447.

Conveying gas by a cover on workpiece B23K 26/1452 , e.g. FR2446141.

Removing of by-products, e.g. particles or vapours produced during treatment of a workpiece (by a flow of gas B23K 26/14)
Definition statement
This subclass/group covers:

Special configuration for evacuating by products between pieces.

References relevant to classification in this group
This subclass/group does not cover:

Removal of by product by using a flow e.g. apiration of by products

Protecting focussing optics against fumes by a flow of gas, e.g. suction

Protecting layer on the material: if beam absorbing

Protecting layer on the material: if not beam absorbing

Evacuation of fumes during welding of plated metal, e.g. zinked or galvanised by creating a gap between workpieces

If by shaping workpiece

B23K 33/00 and subgroups.

using absorbing layers on the material being worked, e.g. for marking or protecting purposes{(observing devices provided with laser radiation protection devices B23K 26/03 ; using masks on the workpiece for shaping the laser beam B23K 26/0661 ; interposing material for facilitating bonding B23K 26/203 ; laser anti-reflection devices, e.g. optical isolators H01S 3/0064)}
Definition statement
This subclass/group covers:

Marking by way of material removal.

Feeding welding wire e.g. DE-U1-9401081, DE-A-4330497, US5408065, DE19944470, DE10061309.

Elements for intercepting radiations at the end of boring a hole even if not applied to the surface, e.g.US6070813.

Relationship between large subject matter areas

Interposition of material for facilitating bonding B23K 26/203.

References relevant to classification in this group
This subclass/group does not cover:

Marking by changing colour or else

Informative references
Attention is drawn to the following places, which may be of interest for search:

Reactive-ion etching

Special rules of classification within this group

Mask on workpiece B23K 26/0661.

Feeding electrode B23K 26/1429.

Bonding, e.g. welding (soldering by means of radiant energy B23K 1/005 ; joining of preformed plastics parts by heating using laser beam B29C 65/16)
Definition statement
This subclass/group covers:

Localised welding with special shaped welded area, e.g. button shaped (GB2342881, US4661677).

References relevant to classification in this group
This subclass/group does not cover:

Coupling light guides

Informative references
Attention is drawn to the following places, which may be of interest for search:

Joining of semiconductor bodies for junction formation by direct bonding

Special rules of classification within this group

Localised welding with special shaped welded area B23K 26/20 and

if shape contains a spot, thus + B23K 26/22,

if shape contains a seam, thus + B23K 26/24 and subgroups.

Welding for purposes other than joining, e.g. build-up welding{(laser alloying or sintering C23C)}
Definition statement
This subclass/group covers:

Laser Cladding.

Relationship between large subject matter areas

Manufacture by laser welding F05B 2230/234.

References relevant to classification in this group
This subclass/group does not cover:

Stereolithography

If metallic

Laser assisted deposition

Alloying or chemical coating of metallic materials

Diffusion treatment of metallic material (e.g. surface alloying); coating of metallic or coating material with metallic material by chemical coating or vacuum evaporation, e.g. sputtering

Laser Based Metal Deposition (LBMD): if powder passing through laser

If not

Informative references
Attention is drawn to the following places, which may be of interest for search:

Shaped metal deposition (SMD)

Sintering Glass

Sintering ceramics

Special rules of classification within this group

Cladding repair B23K 26/34 + B23K 26/3293 , e.g. EP2042618.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Laser net shape manufacturing

laser cladding or laser consolidation.In laser cladding and/or consolidation, a laser beam creates a molten pool on a substrate into which powder is deposited in a beam/powder interaction zone. Concurrently, the substrate on which the deposition is occurring is moving with respect to the beam/powder interaction zone to fabricate the desired cross-sectional geometry. Consecutive layers may be additively deposited, thereby producing a three-dimensional part.

Laser cladding

to enhance the surface properties of machine parts locally with powder or wires melted via a laser beam.

Laser consolidation

involves manufacturing a part through depositing multiple layers of material (EP07102761).

Removing material{(laser wire stripping H02G 1/128 ; cleaning by laser treatment B08B 7/0042)}
Definition statement
This subclass/group covers:

Removing material e.g. ablating, without cutting or boring.

References relevant to classification in this group
This subclass/group does not cover:

Removing of foreign material i.e.g. cleaning, coating removal

Laser assisted chemical etching

Stripping of resist

Ablation for laser recording

Severing conductive links on memory integrated circuits

Laser etching of printed circuit substrate

Informative references
Attention is drawn to the following places, which may be of interest for search:

Laser removal of surface material for decorative purpose

Special rules of classification within this group

Etching, e.g. engraving: B23K 26/365.

Scribing: B23K 26/367 .

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Engraving

Is the practice of incising a design on to a hard, usually flat surface, by cutting grooves into it

Etching

The cut is superfical or partially throught the workpiece, e.g.engraving

Scribing

Cutting deep grooves by laser light on workpieces to separate them mechanically; e.g. Arts for perforating semiconductor wafers or ceramic substrates by laser processing, and dividing them into elements of many units when manufacturing integrated circuits, such as IC

Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
Definition statement
This subclass/group covers:

Welding in a furnace.

Welding by means of an electrolyte.

Combined welding or cutting procedures or apparatus.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Arc sustained laser working

Cutting by means of an electrolyte

Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups (making tubes or profiled bars involving operations other than soldering or welding B21C 37/04 , B21C 37/08)
Definition statement
This subclass/group covers:

Making of profiled bars.

Connecting cutting edges or the like to tools.

Attaching reinforcements to workpieces, e.g. wear-resisting zones to tableware.

Making tubes with soldering or welding.

Processes specially adapted for particular articles or purposes relating to cutting or desurfacing.

Investigating the properties, e.g. the weldability of materials.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Making tubes or profiled bars involving operations other than soldering or welding

Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby{(B23K 11/14 takes precedence)}
Definition statement
This subclass/group covers:

Filling of continuous seams of cylindrical workpieces.

Filling of continuous seams for automotive applications.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Edge treatment flanging

Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
Definition statement
This subclass/group covers:

Interlayers, electrodes, rods, wires, welding studs for metallurgical bonding of workpieces, for soldering, brazing, welding techniques, characterised by their mechanical features, composition, media

Relationship between large subject matter areas

B22F provides for processes of making and working metallic powders. B23K provides for processes of soldering or unsoldering, welding, cladding or plating by soldering or welding, cutting by applying heat locally e.g. flame cutting, working by laser beam. When the method is intended for providing a particular use/product then the use/ product is classified as well (see informative references for some of them). When the composition of the alloy is disclosed, either in claims or description, this one is classified in C22C.

References relevant to classification in this subclass/group
This subclass/group does not cover:

Methods of soldering or unsoldering, welding, brazing, cladding or plating by soldering or welding, cutting

Informative references
Attention is drawn to the following places, which may be of interest for search:

Catalysts

Manufacture of metal sheets, wire, rods, tubes or profiles, otherwise than by rolling

Working metallic powder, powder Metallurgical apparatus or processes

Processes of soldering or unsoldering, welding, cladding or plating by soldering or welding, cutting by applying heat locally

Layered products

Vehicle, vehicle fitting, vehicle parts

Ceramics, refractories

Acyclic or carbocyclic coumpounds

Macromolecular compounds

Heat treatments of welded joints

Alloys

Heat exchangers

Electrical wires

Contacts

Bonding wires, semiconductor devices/details

Electrical connectors

Electronic components

Special rules of classification within this subclass/group

The IPC groups B23K35/04 - B23K35/20 are not used and instead covered by B23K 35/0205 - B23K 35/0294 , while IPC group B23K35/363 is covered by B23K 35/3601 - B23K 35/3618 . Under B23K 35/00 the last place rule is followed (classification in the last appropriate place) combined with multiple classifications for classifying a 100% disclosed alloy composition. When classifying under B23K 35/00 all essential features disclosed should be classified as invention information while all other special features disclosed in claims, description, examples and figures/diagrams should be classified as additional information.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Soldering

process in which two or more metal items are joined together by melting and flowing a filler metal (solder) into the joint, the filler metal having a lower melting point than the workpiece;

Brazing

metal-joining process whereby a filler metal is heated above and distributed between two or more close-fitting parts by capillary action. The filler metal is brought slightly above its melting (liquidus) temperature while protected by a suitable atmosphere, usually a flux. It then flows over the base metal (known as wetting) and is then cooled to join the workpieces together; similar to soldering except using higher temperatures to melt the filler.

Welding

metal-joining process causing coalescence, usually by melting the workpieces and adding a filler material to form a pool of molten material (the weld pool) that cools to become a strong joint, with pressure sometimes used in conjunction with heat, or by itself, to produce the weld

Flux.

a chemical cleaning agent; fluxes facilitate soldering, brazing, and welding by removing oxidation from the metals to be joined

Welding electrode

Electrical conductor used to conduct current through a workpiece to fuse two pieces together

Consumable electrodes

Electrodes used in gas metal arc welding or shielded metal

Non-consumable electrodes

Electrodes used in gas tungsten arc welding

{Interlayers, transition pieces for metallurgical bonding of workpieces}
Definition statement
This subclass/group covers:

Transition pieces for metallurgical bonding of workpieces

Special rules of classification within this subclass/group

If a composition is given it should also be classified in the relevant groups under C22C. For example, a process for producing composite body consisting of soldering at least a part of a high-temperature-resistant, metallic or nonmetallic component and at least a part of a high-temperature-resistant, nonmetallic component, where prior to soldering, a metallic barrier layer, which is impervious to the solder melt, of one or more elements selected from the group consisting of V, Nb, Ta, Cr, Mo, W, Ti, Zr, Hf and alloys thereof, is deposited on that surface of each nonmetallic component which is to be soldered will be classified in B23K 35/005 ,B23K 35/001 . Documents should also be considered for classification in the following fields: soldering methods B23K 1/19; layered products B32B 7/04 B32B 18/00; ceramics C04B 37/003 C04B 37/026 alloys C22C 14/00, C22C 16/00.

characterised by mechanical features, e.g. shape
Definition statement
This subclass/group covers:

Rods, electrodes, materials for use in soldering, welding, or cutting characterized by mechanical feature

Informative references
Attention is drawn to the following places, which may be of interest for search:

Powder metallurgy

Special rules of classification within this subclass/group

If a composition is given it should also be classified in the relevant groups under C22C. For example, a bonding wire for semiconductor, comprising a core and an outer peripheral part formed of a conductive metal and the alloy thereof formed mainly of the same type of elements, respectively, and a diffusion layer and/or an intermetallic compound layer formed of the elements forming the core and the outer peripheral part disposed between the core and the outer peripheral part or comprising a core formed of a first metal having a conductivity or an alloy formed mainly of the first metal, an outer peripheral part formed of a second metal having a conductivity different from that of the first metal of the core or an alloy formed mainly of the second metal, and a diffusion layer and/or an intermetallic compound layer disposed between the core and the outer peripheral part (metals, alloy disclosed) will be classified in B23K 35/0272 . Documents should also be considered for classification in the following fields: manufacture of wires otherwise than by rolling B21C 37/042 ; layered products B32B 15/018 ; semiconductors H01L 24/43 H01L 24/45; and the relevant groups for alloys in C22C.

characterised by the composition or nature of the material
Definition statement
This subclass/group covers:

Rods, electrodes, materials for use in soldering, welding, or cutting characterized by the composition or nature of the material, composition of soldering/brazing/welding materials

Relationship between large subject matter areas

Macromolecular compounds classified in C08F, C08G, C09D.

Special rules of classification within this subclass/group

B23K 35/34 takes precedence. If a composition is given it should also be classified in the relevant groups under C22C For example, a mixture for applying a polymer, non-corrosive, electroconductive coating which can be shaped in a low-abrasive manner, to a base, method for producing a non-corrosive, viscoplastic coating on a base, said coating containing polymer and inorganic particles, and to an electroconductive coating containing polymer and inorganic particles will be classified in B23K 35/226 . Documents should also be considered for classification in the following fields: inorganic substances /macromolecular as compounding ingredients C08K 5/0008 , C09D 5/082 , C09D 5/084 , C09D 5/10, C09D 5/24; H01B 1/22 (use as a cable/conductor). For example, a flux cored wire for welding duplex stainless steel consisting of, by mass% with respect to the mass of the wire as a whole, C: 0.001 to 0.1%, Si: 0.01 to 1.0%, Mn: 2.0 to 6.0%, Cr: 17.0 to 27.0%, Ni: 1.0 to 10.0%, Mo: 0.1 to 3.0%, Al: 0.002 to 0.05%, Mg: 0.0005 to 0.01%, Ti: 0.001 to 0.5%, and N: 0.10 to 0.30%, further limiting P to 0.03% or less and S to 0.01% or less, satisfying 0.73 Cr equivalents - Ni equivalents 4.0 and Ti(mass%) N(mass%) 0.0004, and having a balance of iron and unavoidable impurities will be classified in B23K 35/0266 , B23K 35/3086 , B23K 35/3053 , B23K 35/308 . Documents should be considered for classification in the following field: alloys C22C 38/22, C22C 38/38, C22C 38/40. Similarly, a process of assembling two silicon carbide pieces by non-reactive, moderate refractory welding, comprises contacting the pieces with a non-reactive welding composition respectively a binary alloy formed, as mass percentages, from 56% to 70% silicon and 44% to 30% yttrium, and heating an assembly formed by the pieces and the composition to a sufficient temperature for melting the composition and to form a moderate refractory joint will be classified in B23K 35/327 , B23K 35/025 , B23K 35/24. Documents should be considered for classification purposes in the following fields: welding techniques B23K 1/19, B23K 1/20, B23K 1/0008 , alloys C22C 28/00, ceramics C04B 37/006 .

Selection of non-metallic compositions, e.g. coatings, fluxes (B23K 35/34 takes precedence); Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest (selection of soldering or welding materials proper B23K 35/24)
Definition statement
This subclass/group covers:

Coatings, fluxes compositions, as well as soldering/brazing/welding materials conjoint with non-metallic compositions

Relationship between large subject matter areas

Macromolecular compounds classified in C08F, C08G, C08K, C09D

References relevant to classification in this subclass/group
This subclass/group does not cover:

selection of solderin or welding materials proper

Special rules of classification within this subclass/group

B23K 35/34 takes precedence. If a composition is given it should also be classified in the relevant groups under C22C. For example a cream solder comprising a nitrogen - containing base hydroborofluorate is included by 1x10-3 - 7x10-2 mol. to 100 gr. of flux for solder powder, the nitrogen-containing base being from e.g. propylamine, dipropylamine, allylamine, diallylamine, isobutyl-amine, sec-butylamine, tert-butylamine, etc and the cream solder being for Ag/Pd, Ag/Pt or Ag/Pd/Pt fired body or electrode and also includes a hydrofluorate, hydrochlorate, hydrobrcmate and/or hydroiodate will be classified in B23K 35/3617 ,B23K 35/3612 , B23K 35/025 , B23K 35/22 and will be circulated to organic chemistry field C08. Similarly, a stainless steel flux-cored welding wire for the welding of galvanized steel sheets where the sheath and the flux contain, as metal or alloying components and in a total amount based on the total mass of the wire, C: 0.01 to 0.05%, Si: 0.1 to 1.5%, Mn: 0.5 to 3%, Ni: 7 to 10% and Cr: 26 to 30% with the F value falling within the range of 30 to 50, that the flux contains, as slag formers, TiO2: 3.8 to 6.8%, SiO2: 1.8 to 3.2%, ZrO2: 1.3% or below, and Al2O3: 0.5% or below, that the total amount of these slag formers and the other slag formers is 7.5 to 10.5%, that TiO2 accounts for 50 to 65% of the total amount of all the slag formers, and that the balance of the sheath and the flux consists of Fe and unavoidable impurities will be classified in B23K 35/0266 , B23K 35/308 , B23K 35/362, B23K 35/368. Documents should also be considered for classification in the following fields: Welding techniques B23K 9/00; Alloys C22C 38/02, C22C 38/04 C22C38/40A, C22C 18/04.

Selection of media, e.g. special atmospheres for surrounding the working area
Definition statement
This subclass/group covers:

Selection of media in soldering/welding

Special rules of classification within this subclass/group

If a composition is given it should also be classified in the relevant groups under C22C. For example a perfluoro-heptaglyme, improved vapour-phase soldering fluid - prepares by perfluorination of heptaglyme and method of vapor-phase soldering employing perfluoroheptaglyme as vapor phase soldering fluid is classified in B23K38/F, B23K 35/38.

Making wire or rods for soldering or welding (processes involving a single technical art, see the relevant subclasses, e.g. B05D , B21C)
Definition statement
This subclass/group covers:

Processes of making soldering/welding wire/rods/electrodes

Informative references
Attention is drawn to the following places, which may be of interest for search:

Applying liquids or other materials to surfaces

Powder metallurgy

Special rules of classification within this subclass/group

If a composition is given it should also be classified in the relevant groups under C22C For example a tungsten electrode (alloy composition disclosed) and its method of manufacture will be classified inB23K 35/402 ,C22C 1/04, C22C 27/04, B23K 9/24. Similarly, a seamless tube compound welding electrode made by filling of a pre-formed tube closed at the bottom with a mixt. consisting of several granulated materials such as flux, de-oxidisers, carbides, which are periodically compacted by means of a punch introduced from the top, following which the tube is size reduced by rolling and/or drawing, which also further compacts the filling will be classified in B23K 35/406 , B23K 35/327 , B23K 35/0272 , B23K 35/302 . Documents should be considered for classification purposes in the following fields: Manufacture of metal sheets, wire, rods, tubes or profiles, otherwise than by rolling B21C.

Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups (eye-shields for welders worn on the operator's body or carried in the hand A61F 9/00 { i.e. A61F 9/02 }; applicable to metal-working machines other than soldering, welding, or flame-cutting machines B23Q;{ laser protective screens B23K 26/427 ; } protective shields for other welding methods F16P 1/06)
Definition statement
This subclass/group covers:

Cooling means for welding or cutting.

Safety devices for welding or cutting.

Carriages supporting the welding or cutting element.

Devices or processes for holding or positioning work.

Devices or processes for aligning cylindrical work; clamping devices therefore.

Devices or processes for positioning molten material, e.g. confining it to a desired area.

Devices or processes for flash removal.

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Last Modified: 10/11/2013