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。
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。
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