The laser beam melts a portion of the steel core and the segment backing metal, forming a weld.
激光光束熔体部分钢铁核心和后盾金属部分，形成焊缝。
2
Welding methods and technology of narrow gap quirk backingweld were discussed. Indirect quirk backingweld using manual hydrogen arc welding is considered as the best result.
讨论了窄间隙深槽打底焊焊接方法和工艺，认为用手工氩弧焊进行单面深槽打底焊效果最好。
3
Basic flux-cored wire for backingweld to T91 tube was studied in this paper.