某种纺织机的卷棉辊是由一根壁厚10毫米的管子和两个轴头焊接而成(图1)。轴头是45~#钢,管子是滚珠轴承钢,其含碳量很高,碳当量为1.26。它与45~#钢手工电弧焊的主要问题是易在焊缝及热影响区出现马氏体组织,加上氢脆和应力作用,焊后极易产生裂纹。 The winding roll of a textile machine is made by welding a 10 mm thick pipe and two shaft heads (Figure 1). Shaft is 45 ~ # steel, the ball is a bearing steel, its high carbon content, carbon equivalent of 1.26. It and 45 ~ # steel manual arc welding the main problem is easy to weld and heat affected zone appear martensite, coupled with hydrogen embrittlement and stress, easily cracked after welding.