1 ... backhand welding 逆向焊；右焊法；后焊法；向后焊 backing welding 打底焊 backstep welding 分段逆焊；分段退焊；反向焊；逐步退焊法；逆向焊 ...
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... Shanghai Taichang Welding Backing Factory 上海泰昌焊接衬垫厂 backing welding 打底焊 ; 底层焊接 flux copper backing welding 铜板垫单面潜弧焊 ...
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Ceramic backing welding 陶质衬垫焊
backing welding electrode 底层焊条
welding with backing 衬垫焊 ; 垫板焊
welding with flux backing 焊剂垫焊
brick backing welding 砖形衬垫单面焊
welding backing 焊接衬垫
But in the backing welding, columnar grain-growth will be appeared in the direction of crystal direction, it effects the welding quality seriously.
但是单面焊打底层焊缝中出现的沿焊缝柱状晶结晶方向的柱状气孔，严重地影响着船舶焊接质量。
Welding methods and technology of narrow gap quirk backing weld were discussed. Indirect quirk backing weld 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。
They cause all the welding of double tubes, joint boxes and gas-collecting tubes to realize the backing weld of TAW-P. The quality of the double tube waste heat boilers have been improved.
并对喷嘴、规范参数、坡口形式等作了相应改进，使双套管、联箱、集气管的焊接全部实现了钨极氩弧焊打底，从而提高了双套管废热锅炉的质量。
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