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Metallurgical Investigations of Laser Welding of AISI 304 Stainless Steel

机译:AISI 304不锈钢激光焊接的冶金研究

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Laser welding of AISI 304 stainless steel was carried out by pulsed Nd:YAG laser machine under different welding conditions. Geometrical shape of the joints was circular butt. Studies were focused on laser power, welding velocity, beam diameter and pulse duration. Microstructure of welded joints was investigated by optical microscopy (OM) and scanning electron microscopy (SEM). OM and SEM results show no evidence of grain growth in heat affected zone (HAZ). In addition, columnar and equiaxed grains are observed in the weld metal. Various defects such as lack of fusion, underfill, porosity, hot crack and mismatch are observed as a result of improper welding conditions. The best welding conditions to obtain minimum defects are presented.
机译:通过脉冲Nd:YAG激光机在不同的焊接条件下进行AISI 304不锈钢的激光焊接。关节的几何形状是圆形对接。研究专注于激光功率,焊接速度,光束直径和脉冲持续时间。通过光学显微镜(OM)和扫描电子显微镜(SEM)研究了焊接接头的微观结构。 OM和SEM结果显示没有热影响区域(HAZ)中谷物生长的证据。另外,在焊接金属中观察到柱状和等轴晶粒。由于焊接条件不当,观察到各种缺陷,例如缺乏融合,欠填充,孔隙,热裂纹和不匹配。提出了获得最低缺陷的最佳焊接条件。

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