05CuPCrNi钢等离子弧焊焊接接头的组织与力学性能

Microstructure and mechanical properties of welding joint of 05CuPCrNi steel by plasma arc welding

为了研究等离子弧焊在焊接薄板耐候钢时的优越性,对2 mm厚05CuPCrNi耐大气腐蚀钢分别进行等离子弧焊与MAG焊(熔化极活性气体保护电弧焊)对接焊接,然后对焊接接头分别进行拉伸、弯曲、金相、硬度等试验,通过与MAG焊焊接接头的组织与力学性能对比,结果表明,与MAG焊相比,等离子弧焊时05Cu PCr Ni耐大气腐蚀钢焊接接头强度相对提高约6%,焊接接头组织为更均匀且细小的铁素体+珠光体,并无MAG焊中出现的粗大块状铁素体及贝氏体,焊接热影响区较小,焊接接头弯曲性能良好,硬度值及硬度分布情况与MAG相近且无软化现象。

In order to study the advantages of plasma arc welding in weathering steel plate,in the current study,thick05 Cu PCr Ni atmospheric corrosion resistant steel with 2 mm thick was respectively butt-welded by plasma arc and MAG butt welding. The welding joints were then tested by stretching,bending,metallographic,and hardness test. By comparison with the MAG welding joints in microstructure and mechanical properties,the results show that the strength of the welding joint of 05 Cu PCr Ni atmospheric corrosion resistant steel by plasma arc welding strength was relatively increased by 6%,the ferrite and pearlite in welding joint organizations were more uniform and fine,no coarse massive ferrite and bainite appeared in MAG welding. The welding heat affected zone was narrow and the bending properties of welding joints by plasma arc welding wass good,while the hardness and hardness distribution were similar with that by MAG and no softening phenomenon occurred.