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.

针对及管,特别是小口径薄壁管固定口仰部位易出现气孔、穿、塌陷及热裂纹等问题,分析问题存在的原因,从艺方面入手,提出一套消除气孔及穿的操作手法。