中文名称：打底焊 英文名称：backing weld 定义：在厚板单面坡口对接焊时，为防止角变形或为防止自动焊时发生烧穿现象而先在接头背面坡口根部所进行的一条打底焊道的焊接 。另外在使用陶瓷衬垫的单面焊中，在陶瓷衬垫上进行的第一道焊道的焊接也称为打底焊。
2001-不锈钢管打底焊接工艺的进展_电子资料文库 关键词:不锈钢管;打底焊;药芯焊丝(棒) [gap=6404]Key words :stainless steel tube ;backing weld ;flux - cored wire(rod)
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研究了用于T91钢管打底焊的碱性渣系药芯焊丝。
Basic flux-cored wire for backing weld to T91 tube was studied in this paper.
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。
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.
在苏丹管线用螺旋埋弧焊管生产过程中，根据钢级及强度匹配要求，选用J557焊条作为打底焊材料。
During the manufacturing of SSAW pipe for Sudan pipeline, J557 electrode shall be applied as bottom weld materials according to the matched requirement of grade and strength.
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