研究目的
Investigating the influence of laser power on the grain size and tensile performance of the 5A90 Al–Li alloy T-joint fabricated by dual laser-beam bilateral synchronous welding.
研究成果
The study concludes that the laser power significantly affects the grain size near the fusion line and the tensile strength of the welded T-joint. The tensile strength of the T-joint with the laser power of 2500 W is significantly higher than that with the laser power of 3000 W. The study suggests that controlling the laser power during DLBSW process can improve the tensile strength of the welded T-structure applied in the service component.
研究不足
The study focuses on the influence of laser power on the grain size and tensile performance of the 5A90 Al–Li alloy T-joint, but does not explore other welding parameters such as welding speed, wire feed speed, and incident angle of laser in depth. Additionally, the study is limited to the 5A90 Al–Li alloy and may not be directly applicable to other materials.
1：Experimental Design and Method Selection:
Dual laser-beam bilateral synchronous welding (DLBSW) was employed to produce the 2.5 mm thick 5A90 Al–Li alloy T-joint. The grain morphology and grain size of weld metal (WM) in the T-joint were analyzed and calculated. The tensile experiment, scanning electron microscopy and energy disperse spectroscopy were respectively employed to study the tensile strength, fracture morphology and chemical composition of the T-joint.
2：5 mm thick 5A90 Al–Li alloy T-joint. The grain morphology and grain size of weld metal (WM) in the T-joint were analyzed and calculated. The tensile experiment, scanning electron microscopy and energy disperse spectroscopy were respectively employed to study the tensile strength, fracture morphology and chemical composition of the T-joint.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The 5A90 Al–Li alloy used in the experiment was subjected to solution treatment and rolling process. The dimensions of the skin and stringer were 2.5 mm × 60 mm × 400 mm and 2.5 mm × 35 mm × 400 mm, respectively.
3：5 mm × 60 mm × 400 mm and 5 mm × 35 mm × 400 mm, respectively.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The apparatuses of the experiment were mainly composed of two KR 60HA KUKA robots with six-axis, two solid laser welding heads, a shielding gas device with argon, a wire feeding system and a laser system. The laser system was a TruDisk 12003-disk solid laser, produced by German TRUMPF company.
4：Experimental Procedures and Operational Workflow:
Two group of welding process parameters, which only keep the difference in laser power to achieve better forming and fusion, were filtered for this DLBSW experiment. The detail parameters were given in the paper.
5：Data Analysis Methods:
Metallographic image analysis and grain size calculation were applied to estimate the influence of different laser powers. Hoop tensile experiment, SEM and EDS analysis were employed to respectively evaluate the tensile strength of the T-joint, micro morphology and chemical composition of the fracture area.
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