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三、产生夹渣的原因及防止方法(一)产生夹渣的原因夹渣是焊缝中的非金属夹杂物。产生夹渣的主要原因有以下几方面:第一是由于焊缝边缘不整齐,焊层焊道之间的高低差太大,致使熔渣清理得不干净,第二是焊接电流太小,焊速太快,使熔化金属凝固速度加快,而熔渣却来不及浮出;第三是运条不当,熔渣与铁水分离不清,这样就阻碍了熔渣上浮;第四是焊条与母材的化学成分不匹配,熔渣内含氧、氮过多
Third, the reasons for the generation of slag and prevent (a) the cause of slag inclusions Slag is a non-metallic inclusions in the weld. The main reason for the slag generated in the following areas: First, due to the irregular edge of the weld seam height difference between the weld bead is too large, resulting in clean slag was not clean, the second is the welding current is too small, the welding The speed is too fast, so that molten metal solidification speed, while the slag is too late to emerge; the third is improper transport, slag and hot metal separation, thus impeding the floating slag; fourth electrode and base metal Chemical composition does not match, slag oxygen, nitrogen too much