Analysis of Microstructure and Mechanical Properties of Non-Homogeneous Laser Welding Process for 304L Stainless Steel and Low-Carbon St37 Steel

Document Type : Original Research Paper

Authors

1 Department of Mechanical Engineering, Arak University, Arak, Iran

2 Mechanical Engineering Department, Arak University of Technology, Arak, Iran

3 School of Mechanic Engineering, Shahrekord University, Shahrekord, Iran

4 Arak Machine Sazi, Arak, Iran

10.22084/jrstan.2023.27150.1229

Abstract

 laser welding. In this process, completely uniform and flawless welding with minimal distortion and less residual stress is created due to less local energy, full penetration of the laser beam, and reduction of the heat-affected zone (HAZ). Today, the use of the laser welding process is expanding in the industry due to the high speed of operation and reduction in the weight of the structure. In this research, the laser welding capability of 304L austenitic stainless steel and lowcarbon St37 steel is investigated experimentally using continuous laser welding with a maximum power of 1000 watts. The effect of
the process parameters on weld penetration, microscopic structure, width of the HAZ, mechanical properties, and macrostructure of the HAZ is studied and compared with tungsten inert gas (TIG) welding. In this research, the mechanical properties and microscopic structure of laser welding in two non-homogeneous 304L stainless steel sheets and low-carbon St37 steel are investigated. In this research, using laser energy, an experimental-statistical model based on the design of experiments (DOE) method and adjustment of laser parameters is presented for two non-homogeneous sheets with a thickness of 2mm made of 304L stainless steel and low-carbon steel in the form of butt joints. Then microstructural tests were performed and analyzed by optical microscopy (OM). DOE analyzed the results of microstructures and mechanical properties by the response surface methodology (RSM) and optimal settings, and results were presented. The above results were performed by an experiment method and re-laser testing was performed and
the most ideal parameters and results were obtained. 

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