论文部分内容阅读
使用光学显微镜和显微硬度计测试了不同功率条件下的焊缝组织和硬度;使用液压伺服疲劳试验机测试了不同功率下焊接接头的抗拉强度和疲劳寿命,分析了不同功率条件下疲劳寿命的概率分布与可靠性。结果表明:功率对焊接接头的抗拉强度和伸长率影响不大;焊缝熔合区为“网篮状”的α’针状马氏体,热影响区有少量的α’马氏体;焊缝熔合区的显微硬度高于热影响区,热影响区的显微硬度高于母材,且功率越高,硬度也越高。随着激光功率增大,同等载荷下焊接接头的疲劳寿命变长,可靠性变好。
The microstructure and hardness of the weld under different power were tested by optical microscope and microhardness tester. Tensile strength and fatigue life of the welded joint under different power were tested by hydraulic servo fatigue tester. The fatigue life under different power conditions Probability Distribution and Reliability. The results show that the power has little effect on the tensile strength and elongation of the welded joints. The fusion zone of the weld is α ’acicular martensite with “net basket”, and a small amount of α’ martensite The microhardness of weld zone is higher than that of heat affected zone. The microhardness of HAZ is higher than that of base metal. The higher the power, the higher the hardness. As the laser power increases, the fatigue life of the welded joint under the same load becomes longer, and the reliability becomes better.