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| 光束摆动对T2紫铜激光搭接焊缝成形及力学性能的影响 |
| Effects of Beam Oscillation on Weld Formation and Mechanical Properties of T2 Copper Laser Lap |
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| DOI：10.3969/j.issn.1674-6457.2023.04.015 |
| 中文关键词: T2紫铜 激光搭接焊 光束摆动 焊缝成形 显微硬度 结合面熔宽 力学性能 |
| 英文关键词: T2 copper laser lap welding beam oscillation weld formation microhardness interface weld depth mechanical properties |
| 基金项目:广东省自然科学基金(2314050004977) |
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| 中文摘要: |
| 目的 采用激光光束摆动方式改善T2紫铜激光焊接的焊缝质量，提高T2紫铜搭接焊接头的力学性能。方法 对比不同摆动模式下T2紫铜搭接焊接头的焊缝成形，测试圆形摆动模式下摆动频率和摆动幅度对接头横截面形状的影响。采用显微镜观察分析焊缝金相组织，并研究摆动工艺参数对显微硬度、抗剪力的影响规律，最终得到最佳的工艺参数组合。结果 相对于常规激光焊接和横向、无穷摆动模式，圆形摆动模式下T2紫铜焊缝成形最好。圆形摆动模式下，摆动频率从100 Hz增大到600 Hz时，熔深相应减小，熔宽变化不大;摆动幅度从0 mm增大到2 mm时，熔深相应减小，熔宽增大。接头断裂形式一般为焊缝边缘断裂，且接头光束摆动重熔区域等轴晶有所增加。当摆动频率由100 Hz增大到500 Hz时，结合面熔宽变化不大，显微硬度相应增大，接头得到强化，抗剪力由2.07 kN增大至2.32 kN;当摆动幅度从0 mm增大到1.2 mm时，显微硬度有所降低，结合面熔宽由0.332 mm增大到1.347 mm，抗剪力随之由1.35 kN增大至2.36 kN。结论 圆形光束摆动模式下，当A=1 mm，f≥300 Hz或f=300 Hz，1 mm≤A≤1.5 mm时，能明显改善T2紫铜表面焊缝质量;激光光束的摆动有利于增大结合面熔宽，从而提高T2紫铜搭接焊接头的力学性能。 |
| 英文摘要: |
| The work aims to improve the weld quality of T2 copper laser welding and improve the mechanical properties of T2 copper lap welding joint through laser beam oscillation. The weld formation of T2 copper lap welding joint was compared under different oscillating modes. The effects of oscillating frequency and oscillating amplitude on the joint cross section shape in circular oscillating mode were tested. The microstructure was observed and analyzed with microscope and the effects of oscillating parameters on microhardness and shear resistance were studied. Finally, the best combination of parameters was obtained. The results showed that compared with conventional laser welding and transverse and infinite oscillating mode, the T2 copper weld in circular oscillating mode had the best formation. In the circular oscillating mode, the oscillating frequency increased from 100 Hz to 600 Hz, and the weld depth decreased correspondingly, while the weld depth changed little. When the oscillating amplitude increased from 0 mm to 2 mm, the weld depth decreased and the weld depth increased. Generally, the fracture form of joint was weld edge fracture and equiaxed grain increased in the beam oscillating remelting area of joint. When the oscillating frequency increased from 100 Hz to 500 Hz, the interface weld depth changed little, the microhardness increased correspondingly, the joint was strengthened and the shear resistance increased from 2.07 kN to 2.32 kN. When the oscillating amplitude increased from 0 mm to 1.2 mm, the microhardness decreased to some extent, the interface weld depth increased from 0.332 mm to 1.347 mm, and the shear resistance increased from 1.35 kN to 2.36 kN. In the circular beam oscillating mode, when A=1 mm, f≥300 Hz or f=300 Hz, 1 mm≤A≤1.5 mm, the weld quality of T2 copper surface can be significantly improved. The laser beam oscillation is beneficial to increase interface weld depth and improve the mechanical properties of the T2 copper lap welding joint. |
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