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首页> 外文期刊>Lasers in Manufacturing and Materials Processing >Application of the Pulsed Nd: YAG Laser Welding to Investigate the Effect of Laser Beam Position on Weld Characteristics of AISI 420 Stainless Steel to Kovar Alloy
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Application of the Pulsed Nd: YAG Laser Welding to Investigate the Effect of Laser Beam Position on Weld Characteristics of AISI 420 Stainless Steel to Kovar Alloy

机译：应用脉冲Nd：YAG激光焊接研究激光束位置对AISI 420不锈钢与可伐合金的焊接特性的影响

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摘要

In the present study, dissimilar joining of AISI 420 Stainless Steel (SS 420) to Kovar alloy using a pulsed Nd: YAG laser welding was carried out. The effect of laser beam position with respect to the joint on the microstructure of dissimilar weldmetal was investigated through taking advantage of optical and scanning electron microscopy. Moreover, hardness measurement and fractography were performed to investigate the mechanical properties of weldmetal. A detailed effect of laser beam position on crack susceptibility of fusion zone is elaborated in this research work. The results showed promotion of susceptibility of fusion zone to cracking with offsetting laser beam position to SS 420 base metal. Also martensitic structure was formed in the weldmetal when off-set laser beam shifted 0.2 mm toward the SS 420 base metal. The microhardness test revealed that moving laser beam position toward SS 420 resulted in increasing weld hardness.
机译：在本研究中，采用脉冲Nd：YAG激光焊接将AISI 420不锈钢（SS 420）与科瓦合金进行了异种连接。利用光学和扫描电子显微镜研究了激光束相对于接头的位置对异种焊缝金属组织的影响。此外，还进行了硬度测量和断裂分析，以研究焊接金属的力学性能。这项研究工作详细阐述了激光束位置对熔合区裂纹敏感性的影响。结果表明，随着激光束位置偏移到SS 420母材上，熔化区对裂纹的敏感性增强。当偏心激光束向SS 420母材偏移0.2 mm时，在焊接金属中也会形成马氏体结构。显微硬度测试表明，将激光束位置移向SS 420会导致焊接硬度增加。

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