Inside welding seam cracking of spiral submerged Arc welded pipe is the unsolved problem for many years in the pipe field.

螺旋埋弧焊钢管内焊缝裂纹是本行业多年未解决的问题。

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After visual inspection and metallographic test, analysis and discuss the welding zone cracking reasons for 6061 and A7003 aluminum alloy thin-walled tube after TIG (argon shielded arc) welding.

通过宏观及微观检测，分析了6061铝合金管及A7003铝合金薄壁管经TIG(氩弧)焊后的焊接区开裂的原因。

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The most reason of cracking breakout is badness of arc and high temperature of molten steel and high withdrawal speed.

对弧不良、钢水温度高、拉速快是造成裂纹漏钢的主要原因；

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