研究目的
Investigating the microstructure and tensile properties of thick-section TC4 alloy joints welded by laser-MIG hybrid (LAMIG) welding under different heat inputs.
研究成果
1. The weld seam microstructure consisted of α’ martensite and β phases, with grain size varying between the cosmetic and backing weld zones due to different cooling rates. 2. Increasing heat input transformed α’ martensite morphology from acicular to platelet-like, facilitating crack propagation along grain boundaries. 3. Fracture surfaces transitioned from stretch- and equiaxial-type dimples to stretch and tearing elongation-type dimples with increased heat input, suggesting lower heat input is preferable for LAMIG welding of thick-section TC4 alloy.
研究不足
The study primarily focuses on the effects of heat input on microstructure and tensile properties, with limited exploration of other welding parameters or conditions that could influence joint performance.
1：Experimental Design and Method Selection:
The study employed laser-MIG hybrid welding (LAMIG) to join thick-section TC4 alloy, analyzing the microstructure and mechanical properties under varying heat inputs.
2：Sample Selection and Data Sources:
The base material was thick-section TC4 alloy with dimensions of 15 × 200 × 80 mm, using TC4 standard welding wire ERTi-6Al-4V as the filler material.
3：List of Experimental Equipment and Materials:
Equipment included an IPG Photonics YLR-10000 fiber laser system and a Fronius TPS4000 MIG welding system. Materials included TC4 alloy and ERTi-6Al-4V welding wire.
4：Experimental Procedures and Operational Workflow:
The welding process involved double-sided LAMIG welding with a four-layer welding process, varying heat inputs for the cosmetic weld.
5：Data Analysis Methods:
Microstructure was analyzed using SEM and TEM. Tensile strength was measured using an electromechanical testing machine, and fracture surfaces were examined with SEM.
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fiber laser system
YLR-10000
IPG Photonics
Used for laser welding in the study
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scanning electron microscope
Quanta 200FEG
FEI
Used for microstructure and fracture surface analysis
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transmission electron microscope
Tecnai G2 F30
FEI
Used for morphology and diffraction patterns characterization of phases
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MIG welding system
TPS4000
Fronius
Used for arc welding in the study
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electromechanical testing machine
Instron plus 50 kN
Used for tensile strength testing
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in-situ tensile equipment
MICROTEST2000
Gatan
Used to investigate the effect of microstructure on crack propagation
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