SUS301L-HT不锈钢激光焊接与MIG焊接对比试验研究

发布时间：2018-07-05 01:01

  本文选题：光学制造 + 激光焊接　； 参考：《中国激光》2015年07期

【摘要】：进行了2 mm SUS301L-HT不锈钢激光焊和惰性气体保护(MIG)焊试验,对比了两组焊缝在成形、显微组织、力学性能等方面的差别。两种焊接方法焊得的焊缝在成形上有较大不同,激光焊焊缝成形均匀稳定,接头角变形小,熔宽小,热影响区(HAZ)窄,优于MIG焊缝。两种焊接方法焊得的焊缝的金相组织差异较大,激光焊焊缝组织由细小柱状奥氏体枝晶和枝晶间δ铁素体组成,HAZ发生了回复和再结晶,晶粒有一定程度的长大;MIG焊缝由粗大的块状奥氏体组织和少量δ铁素体组成,HAZ组织变化丰富,组织随着与熔合线距离的改变而不同。两种焊接方法焊得的焊缝的力学性能差异明显,激光焊焊缝拉伸性能优于MIG焊缝,激光焊接头拉伸断裂在焊缝,断口为典型韧性断口,接头抗拉强度达到979.1 MPa,延伸率达到48.2%。
[Abstract]:The laser welding experiments of 2 mm SUS301L-HT stainless steel and the inert gas shielded (MIG) welding were carried out. The differences in forming, microstructure and mechanical properties between the two groups were compared. The weld formed by the two welding methods is quite different. The laser welding weld is uniform and stable, the joint angle deformation is small, the melting width is small, and the HAZ is narrow, which is superior to the MIG weld. The microstructure of the weld welded by two welding methods is quite different. The microstructure of laser welding weld is composed of fine columnar austenitic dendrite and interdendritic 未 ferrite, which is recovered and recrystallized. The microstructure of MIG welds with a certain degree of grain growth is rich in changes from coarse bulk austenitic microstructure and a small amount of 未 ferrite, and the microstructure varies with the change of the distance from the fusion line. The mechanical properties of the weld welded by the two welding methods are obviously different. The tensile properties of the laser welding weld are superior to those of the MIG weld. The tensile fracture of the laser welding joint is typical toughness fracture, the tensile strength of the joint is 979.1 MPA, and the elongation is 48.2%.
【作者单位】： 华中科技大学材料科学与工程学院;
【基金】：国家自然科学基金(51323009)
【分类号】：TG456.7
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本文编号：2098227