US 9,808,876 B2
Stainless steel weldment and pad combined welding method
Jiewen Xia, Anhui (CN); Qingping Huang, Anhui (CN); Jialin Chen, Anhui (CN); Yuxian Su, Anhui (CN); Wenwei Li, Anhui (CN); Liyang Pang, Anhui (CN); and Yan Wu, Anhui (CN)
Assigned to CHINA NATIONAL CHEMICAL ENGINEERING THIRD CONSTRUCTION CO., LTD, Huainan, Anhui (CN)
Appl. No. 14/408,447
Filed by CHINA NATIONAL CHEMICAL ENGINEERING THIRD CONSTRUCTION CO., LTD, Huainan, Anhui (CN)
PCT Filed Sep. 3, 2013, PCT No. PCT/CN2013/082851
§ 371(c)(1), (2) Date Dec. 16, 2014,
PCT Pub. No. WO2014/173060, PCT Pub. Date Oct. 30, 2014.
Claims priority of application No. 2013 1 0149268 (CN), filed on Apr. 26, 2013.
Prior Publication US 2015/0144600 A1, May 28, 2015
Int. Cl. B23K 9/035 (2006.01); B23K 9/167 (2006.01); B23K 31/02 (2006.01); B23K 37/04 (2006.01); B23K 9/02 (2006.01); B23K 9/025 (2006.01); B23K 103/04 (2006.01)
CPC B23K 9/035 (2013.01) [B23K 9/0352 (2013.01); B23K 9/167 (2013.01); B23K 31/02 (2013.01); B23K 37/0408 (2013.01); B23K 9/0213 (2013.01); B23K 9/0253 (2013.01); B23K 2203/05 (2015.10)] 9 Claims
OG exemplary drawing
 
1. A stainless steel weldment and pad combined welding method, comprising steps of:
(a) respectively processing and pairing butts of to-be-welded portions of two weldments, wherein, during pairing, inner walls of the two weldments are aligned at the same plane; the butts of the two weldments are opposed to form a V-shaped groove with an angle α; and between bottoms of the butts of the two weldments is kept a gap L of 2-4 mm;
(b) providing a copper pad at the gap between the bottoms of the butts of the two weldments, wherein the copper pad closely attaches to the inner walls of the two weldments;
(c) welding the V-shaped groove to form a root pass; and
(d) removing the copper pad, and filling the root pass to be welded into a cover pass, wherein the copper pad is 2 mm thick, 20-30 mm wide, and 100-200 mm long; the copper pad is manually inserted from external sides of the two weldments, through the gap between the bottoms of the butts, into the inner sides of the weldments to closely attach to the inner walls of the two weldments; and the copper pad is manually held to synchronously move with an arc.