高碳中锰奥氏体钢与中碳调质铸钢的焊接工艺

Welding process of high carbon medium manganese austenitic steel and medium carbon quenched and tempered cast steel

针对高碳中锰奥氏体钢与中碳调质铸钢的本质特征,理论分析了其焊接性,采用熔化极气体保护焊接方法进行两种钢的焊接试验。选用了不锈钢焊丝、不同的保护气体、不同的预热工艺、不同的多层道方法及不同的焊接热输入进行对比,借助力学性能设备、光学显微镜等手段分析了焊接接头的宏观金相、微观组织形貌和力学性能。结果表明,选用95%Ar+5%O 2的混合气体、小热输入、多层多道焊、不预热的焊接工艺,焊接性差的高碳中锰奥氏体钢与中碳调质铸钢可以得到优良的焊接接头,同时节约了成本、提高了效率。

According to the essential characteristic of high carbon medium manganese austenitic steel and medium carbon quenched and tempered cast steel,their weldability was theoretically analyzed and their welding procedure tests were made with gas metal arc welding.The test comparison was made under a stainless steel welding wire with different shielding gas,different preheating process,different welding methods of multi-layer and multi-pass and different welding heat input.Macrostructure,microstructure and mechanical properties of welded joints were studied by means of the optical microscopy and mechanical properties measuring equipments.The result showed that high carbon medium manganese austenitic steel and medium carbon quenched and tempered cast steel with poor weldability could obtain excellent welded joint with mixed gas of 95% Ar+5% O2,low welding heat input,welding methods of multi-layer and multi-pass and no preheating,meanwhile,by which the cost was reduced and the efficiency was improved.