管状45°固定CO2半自动焊反面成形不良,内部易出现气孔、未融合、夹渣等,通过对焊接缺陷产生原因的分析,调整焊接工艺参数和操作方法,提高焊接质量,从而获得良好的焊接接头。 Tubular 45 ° fixed carbon dioxide semi-automatic welding negative forming bad, easy to appear inside the pores, un-fusion, slag and so on, through the analysis of welding defects, adjust the welding process parameters and methods of operation to improve the quality of welding, so as to obtain a good welded joints .