42CrMo钢活塞激光-MAG复合焊接热裂纹试验
Testing of hot crack using laser-MAG combined welding for 42CrMo steel
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摘要: 利用高速相机观测焊接时熔池流动和焊缝凝固过程，并求得固–液界面移动速率；利用红外热像仪采集焊缝温度随时间变化的相关信息，求得焊缝的温度梯度，对比研究42CrMo调质钢在激光焊接、激光引导的激光-MAG复合焊、电弧引导的激光–电弧复合焊三种焊接工艺时，焊缝接头处的热裂纹倾向.结果表明，激光引导的激光-MAG复合焊工艺比其它两种焊接工艺的固–液界面移动速率更小，焊缝的温度梯度也更小，具有最小的应变率和热裂纹敏感性.最后对激光引导的激光-MAG复合焊焊缝进行了显微组织观察和硬度分析.Abstract: The welding processes of transient flow and solidification behaviors were observed using high speed camera. The moving velocity of the interface between solids and liquids was calculated. The temperature variation of welding process was obtained by infrared thermal imager and the temperature gradient was calculated. The hot crack tendency of welded joint was investigated under three welding process of autogenous laser welding, laser-MAG hybrid welding guided by laser and laser-arc hybrid welding guided by arc. The results show laser-MAG hybrid welding guided by laser produced the lower moving velocity of solids and liquids, the lower temperature gradient, and smaller strain rate and sensitivity of hot crack. The microstructure and hardness were also tested in laser-MAG hybrid welding guided by laser.
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Keywords:
- 42CrMo steel /
- laser-MAG hybrid welding /
- hot crack /
- girth welding
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