多次补焊对30CrMnSi钢焊接接头组织与性能的影响

Influence of Multiple Repair Welding on Microstructure and Properties of 30CrMnSi Steel Welded Joints

摘要: 以焊缝中心连续气孔为代表，研究了多次补焊对30CrMnSi钢TIG焊接头组织与性能的影响。结果表明，由于多次补焊对焊接接头的重复热作用，导致完全淬火区晶粒粗化、不完全淬火区回火软化，使焊接接头力学性能下降，一、二、三次补焊接头的抗拉强度相比焊接接头分别降低了8.5%、15%和19.8%。

Abstract: In this paper, the influence of multiple repair welding on the microstructure and properties of 30CrMnSi steel welded joints was studied, and the continuous porosity in the weld center was taken as the representative. The results indicate that the grain coarsening in the complete quenching zone and tempering softening in the incomplete quenching zone occur, due to the repeated thermal effect of the multiple repair welding on the welded joints. As a result, the mechanical properties decrease, and the tensile strength of the welded joints for once, twice and three times repair welding decreases by 8.5%, 15% and 19.8% respectively, comparing with the non- repair welding.