Air hole, burnthrough, cooapse and welding crackle occurred in the fixed overhead weld for aluminium and aluminium alloy tubes, above all the small-size thin wall tube.

针对铝及铝合金管,特别是小径薄壁管固定部位易出现气孔、穿、塌陷及接热问题,分析问题存在的原因,从接工艺方面入手,提出一套消除气孔及穿的操作手法。