应用高效的气体保护熔化极电弧焊焊接铝合金薄板时，容易出现熔池下塌、烧穿等焊接缺陷。
Welding defects such as collapse of molten pool, burning through, would like to happen in the high efficient gas shielded metal arc welding.
结果表明，熔池表面和底部的温度都低于电弧焊，这是造成低稀释率的根本原因；
The result shows that the temperatures of molten pool surface and bottom are lower than those ones in arc welding. This is main cause of formation of low dilution rate.
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