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采用埋弧自动焊焊接20g时,经常出现焊接接头冷弯试验不合格的现象。究其原因主要是熔合区的显微裂纹在冷弯时发生了扩展。熔合区的这种显微裂纹属结晶裂纹和半熔化区中的液化裂纹。解决的办法有两个:一是降
Submerged arc welding using automatic welding 20g, often appear welded joints cold bending test failed. The reason is mainly that the microcracks in the fusion zone expand when they are cold-formed. Such microscopic cracks in the fusion zone are crystalline cracks and liquefied cracks in the semi-molten zone. There are two solutions: First, drop