P92钢的CMT+P焊接接头组织性能
Microstructures and properties of P92 welding joint obtained by CMT+P welding
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摘要: 介绍了冷金属过渡+脉冲(CMT+P)焊接的焊接方法和特点. 采用CMT+P焊接工艺对P92钢板进行了对接焊接试验，并对比分析了P92钢的CMT+P焊接工艺与TIG打底+SMAW填充焊焊接工艺的焊接接头组织和性能. 结果表明，两种工艺的焊接接头经热处理后均为回火马氏体组织，且CMT+P的马氏体板条间距较小，热影响区为等轴晶且较窄，高温蠕变性能相对较好；CMT+P焊接接头抗拉强度优于母材，且冲击韧性与TIG打底+SMAW填充焊焊接头冲击韧性水平相当. 进而证实了CMT+P可作为P92钢焊接工艺的一种新选择.Abstract: Welding method and characteristics of cold metal transfer + pulse welding (CMT+P) were introduced. P92 steel was butt joined by the CMT+P process, while microstructures and mechanical properties of welding joints were analyzed and compared to those of TIG+SMAW joints. The results showed that the microstructures in both of the welding joints were tempered martensite after welding and heat treatment. The martensite lath of the CMT+P joint was smaller. Heat affected zone of the CMT+P joint with the equiaxed grains was relatively narrower. High temperature creep performances of the CMT+P joints were relatively better. The tensile strength of the CMT+P joint was superior to that of parent metal, while the impact toughness of the CMT+P joint was corresponded with that of the TIG+SMAW joint. Therefore, the CMT+P welding process can be thought as a new choice to weld P92 steel.
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