研究目的
To simulate the thermo-mechanical behavior of Al/steel tungsten inert gas (TIG) arc-assisted laser welding-brazing (A-LWB) butt joint and analyze the differences in the welding temperature field, residual stress and welding distortion by A-LWB and by single laser welding-brazing (SLWB).
研究成果
The numerical simulation results are in good agreement with the experimental results, verifying the effectiveness of the FEM. A-LWB can make the high-temperature distribution zone of weld in width direction wider, decrease the transverse tensile stress in the weld and reduce the distribution range of longitudinal tensile stress compared to SLWB. The welding deformation also decreases to some extent with A-LWB.
研究不足
The study focuses on the thermo-mechanical behavior of Al/steel TIG arc-assisted laser welding-brazing (A-LWB) butt joint and compares it with single laser welding-brazing (SLWB). The limitations include the specific materials used (ST04Z galvanized steel and 5A06 aluminum alloy) and the specific welding parameters.
1：Experimental Design and Method Selection:
The thermo-elastic?plastic FEM is used to simulate the thermo-mechanical behavior of Al/steel TIG arc-assisted laser welding-brazing (A-LWB) butt joint. The influence of material nonlinearity, geometrical nonlinearity and work hardening on the welding process is studied.
2：Sample Selection and Data Sources:
The materials were ST04Z galvanized steel and 5A06 aluminum alloy, and their sizes were 150 mm× 50 mm × 1 mm and 150 mm × 50 mm × 2 mm, respectively.
3：List of Experimental Equipment and Materials:
The experimental equipment consisted of the GS-TFL-10KCO2 laser and the HYLONG WSE?250 TIG welder.
4：Experimental Procedures and Operational Workflow:
The laser vertically heated the base metal surface and deviated about 2 mm from the edge of aluminum alloy. In addition, the TIG arc tilted toward the welding direction. During the welding process, the plates were restrained by the fixture.
5：Data Analysis Methods:
The welding residual stress of A-LWB was measured by the MSF/PSF?3M X-ray stress analyzer. The contour of the plate was measured by the Global Image 9128 coordinate measuring machine (CMM), and the Cero 2.0 software was used to characterize the data point cloud measured by CMM.
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