小直径SA-335P92钢管细丝埋弧焊工艺及性能

Process and performance of fine wire submerge arc welding for minor diameter SA-335P92 steel pipe

分析小直径SA-335P92钢管焊接工艺方案,阐述目前焊接工艺中存在的问题,提出一种新组合焊接工艺——手工氩弧焊+细丝埋弧焊用于小直径SA-335P92钢管的焊接。以SA-335P92钢管为试验材料进行新焊接工艺试验,并对焊接接头进行力学性能试验和宏观、微观组织分析。结果表明,焊接接头的抗拉强度、冲击、硬度等性能均能满足SA-335P92母材的要求,焊缝和热影响区的微观组织与SA-335P92母材的组织同为回火马氏体。

According to analyze the welding processes of the minor diameter SA-335P92 steel pipe, expatiate on the problems existing in the current welding process. In this paper, present a new comhination welding process with manual gas tungsten arc welding and submerge arc welding for the welding of minor diameter SA-335P92 steel pipe. Carry out the new process test with the SA-335P92 steel pipe,test mechanical property and the macro and micro organization of the welding joint. The results show that the mechanical properties of the welding joint could satisfy the requirements of the SA-335P92 steel pipe, the organization of the welding seam and heat affect zone is tempered martensite the same as the base metal of SA-335P92.