在化工机械制造业中，复合钢容器和器械的焊接占有较大的比重。当制造在腐蚀介质中工作的器械时，采用复合钢可以显著地降低稀有高合金钢的耗费。这些钢的焊接在接头形式上不同于同类钢，焊缝由三层组成（基层、过渡层和复层），各层的焊接在采用不同的焊接方法和焊接材料的同 In the chemical machinery manufacturing industry, composite steel containers and equipment welding occupy a larger proportion. The use of composite steels can significantly reduce the cost of rare high alloy steels when manufacturing equipment that operates in corrosive media. These steel welding joints in the form of different from the same type of steel, the weld consists of three layers (grassroots, transitional layer and cladding), the welding of the layers in the use of different welding methods and welding materials