对30CrMnSi钢、A_3钢进行模拟焊接试验,观察分析了接头组织变化.对焊接冷裂纹产生的组织因素进行了分析,并对生产中制定焊接工艺规范提出意见. The simulated welding tests of 30CrMnSi steel and A_3 steel were carried out, the changes of joint structure were observed and analyzed, the microstructure factors of welding cold crack were analyzed, and the welding process specifications in production were put forward.