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CO2气体保护焊是一种高效率,低成本的焊接方法,这种焊接方法在工程机械制造、钢结构行业极为广泛的应用并且占据了整个焊接生产的主导地位;但是由于CO2气体保护焊本身的一些特点,如果焊接参数的选择不正确或操作方法不当,则容易产生未熔合缺陷,其危害性是比较严重的一种缺陷;本文针对CO2气体保护焊未熔合缺陷在无损探伤中存在的位置、特征,确定未熔合产生的主要原因是焊接电流大、电弧电压过小、焊接速度慢、每层焊缝厚度尺寸较大、液态金属倒流、焊接电弧未熔化母材等因素,通过查阅资料和实践操作反复进行分析论证,总结出在焊接过程中防止未熔合工艺措施和操作方法。
CO2 gas shielded welding is a kind of high efficiency and low cost welding method. This kind of welding method is widely used in construction machinery manufacturing and steel structure industry and takes the leading position in the entire welding production. However, due to the nature of CO2 gas shielded welding Some of the characteristics, if the welding parameters are not properly selected or improper operation method, it is easy to produce unfused defects, the hazard is a serious defect; In view of the CO2 gas shielded welding defects in non-destructive flaw detection in the presence of non-destructive testing, Characteristics, to determine the main reasons for the formation of unmelted welding current is large, the arc voltage is too small, slow welding speed, the thickness of each seam size larger, liquid metal backflow, welding arc unmelted base metal and other factors, through access to information and practice Operation repeated analysis and demonstration, concluded that in the welding process to prevent unmelted process measures and methods of operation.