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首页> 外文期刊>Optics & Laser Technology >Optimization of laser welding process parameters in dissimilar joint of stainless steel AISI316/AISI1018 low carbon steel to attain the maximum level of mechanical properties through PWHT
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Optimization of laser welding process parameters in dissimilar joint of stainless steel AISI316/AISI1018 low carbon steel to attain the maximum level of mechanical properties through PWHT

机译：不锈钢AISI316 / AISI1018低碳钢不同接头激光焊接工艺参数优化，通过PWHT获得最大机械性能水平

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摘要

In this investigation, laser welding process parameters have been optimized for austenitic stainless steel (AISI316) and low carbon steel (AISI1018) materials by using Taguchi based grey relational analysis. Butt joint trials were carried out using 3.5 kW diffusion-cooled slab CO2 laser by varying laser power, welding speed, and focal distance. The optimum parameters have been derived by considering the responses such as tensile strength and microhardness. The optimal parameters are laser power 2600 W, welding speed 1.5 m/min and focal distance 20 mm. The responses of the optimized parameters obtained using the grey relational analysis has been verified experimentally. Formerly, the effect of post weld heat treatment (860 degrees C and 960 degrees C) on the mechanical properties, microstructure and chemical composition of weld zone of the optimal welded joint was investigated by using tensile test, microhardness, bend test, optical microscope, SEM and EDS. The results show that the optimal welded joint had good mechanical properties after post weld heat treatment so that the best tensile strength 475.112 MPa was obtained at 960 degrees C. Due to the elimination of chromium carbide and reduce grain size, the heat treated samples show high corrosion resistance at 960 degrees C in comparison to 860 degrees C.
机译：在该研究中，通过使用基于Taguchi的灰色关系分析，对奥氏体不锈钢（AISI316）和低碳钢（AISI1018）材料进行了激光焊接工艺参数。通过改变激光功率，焊接速度和焦距，使用3.5 kW扩散冷却的板坯CO2激光进行对接联合试验。通过考虑诸如拉伸强度和微硬度等响应来得出最佳参数。最佳参数是激光功率2600W，焊接速度1.5米/分钟，焦距20mm。通过实验验证了使用灰色关系分析获得的优化参数的响应。以前，通过使用拉伸试验，微硬度，弯曲试验，光学显微镜，研究了焊接焊接热处理（860℃和960℃）对机械性能的影响，对最佳焊接接头的焊接区的机械性能，微观结构和化学成分进行研究， SEM和EDS。结果表明，最佳焊接接头在焊接后热处理后具有良好的机械性能，使得在960℃下获得最佳拉伸强度475.112MPa。由于消除碳化铬并降低晶粒尺寸，热处理样品显示出高与860℃相比，960℃的耐腐蚀性。

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