研究目的
To reveal the mechanism of microstructure variation at interlaminar position by the combination of acceptable simulation results and metallurgy analysis in multi-layer hybrid laser-arc welding of 316L stainless steel.
研究成果
The study successfully simulated the single laser beam welding and hybrid laser-arc welding, providing an accurate prediction of weld cross-sectioned geometry. It clarified the forming mechanism of feathery ferrite by combining the simulated temperature histories with microstructure analysis. The test results of micro-hardness and residual stress along the thickness direction of the weld sharply changed at the interlayer position, indicating that the grain size and orientation in the re-melting zone changed greatly.
研究不足
The discrepancy between the experimental data and numerically predicted was caused by the measuring error of the X-ray diffraction machine due to the irregular surface of weld.
1：Experimental Design and Method Selection
The study involved experimental research and thermal-plastic analysis of 316L stainless steel multi-layer hybrid laser-arc welding. A new combined heat source 'double ellipsoid + conical' was proposed to simulate hybrid laser-arc welding (HLAW) and laser beam welding (LBW).
2：Sample Selection and Data Sources
The dimensions of the two 316L stainless steel plates for butt welding were 100×60×10mm. The filler wire was 1.2mm-diameter (316LSi).
3：List of Experimental Equipment and Materials
Continuous wave solid-state Ytterbium fiber laser system (YLS-10000, IPG Photonics Corporation), ABB robot (IRB-4400, ABB), MIG welding torch (YW-50, Precitec), Fronius welding machine (TransPuls Synergic (TPS)-4000, Fronius).
4：Experimental Procedures and Operational Workflow
The based layer (1st layer) was applied laser beam welding (LBW layer), the remaining layers (2nd and 3rd layer) was employed hybrid laser-arc welding to fill the groove (HLAW layer). 'laser lead' mode was conducted during HLAW process.
5：Data Analysis Methods
The micro-hardness was measured with a Vickers micro-hardness tester. X-ray Stress Analyzer (PROTO_LXRD, Canada, Mn- radiation, 25KV, 25mA, Cr filter,) was performed to measure the residual stress.
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