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1·Basic flux-cored wire for backing weld to T91 tube was studied in this paper.

研究了用于T91钢管打底焊的碱性渣系药芯焊丝。

2·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。

3·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。

4·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。

5·It was found that impact toughness of weld metal was maximum using carbon arc air gouging, and it was minimum using acid backing.

结果表明，清根方式对焊缝冲击韧度有明显影响，用碳弧气刨清根得到的焊缝冲击韧度最好，而用酸性衬垫得到的焊缝冲击韧度最差。