研究目的
Investigating the feasibility of laser welding-diffusion bonding for Ti alloy-SS joint with Cu-base filler metal to avoid the formation of brittle Ti-Fe intermetallics in the joint.
研究成果
The study successfully developed a welding process to ensure partial melting of Ti alloy and avoid mixing of Ti alloy and SS, eliminating the formation of brittle Ti-Fe intermetallics in the joint. The joint fractured at the diffusion weld with the maximum tensile strength of 128 MPa.
研究不足
The tensile strength of the joint was about 128 MPa, which was 23% of initial SS (550 MPa). The joint fractured in Ti alloy side of the diffusion weld during tensile tests, indicating the reaction layer at Ti alloy side in diffusion weld became the weak zone of the joint.
1：Experimental Design and Method Selection:
The study introduced a new welding process combining fusion welding and diffusion welding to avoid melting and liquid mixing of the base metal during welding. The laser was used as the welding heat source, and the Cu-based solder was used as the intermediate layer material.
2：Sample Selection and Data Sources:
The base materials used are 1 mm plates of 304 stainless steel and TC4 Ti alloy. The filler metal used was 0.2 mm plate of Cu-base filler metal.
3：2 mm plate of Cu-base filler metal. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: CW laser with average power of 1.20 kW, wavelength of 1080 nm and beam spot diameter of 0.1 mm. Argon gas with the purity of 99.99% was applied as a shielding gas.
4：20 kW, wavelength of 1080 nm and beam spot diameter of 1 mm. Argon gas with the purity of 99% was applied as a shielding gas. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser beam was focused on the SS plate
5：5 mm away from the Ti alloy interface. The welding parameters were:
laser beam power of 480 W, defocusing distance of +5 mm, welding speed of 650 mm/min.
6：Data Analysis Methods:
The microstructure of joints were studied by optical microscopy, scanning electron microscope SEM with fast energy dispersion spectrum EDS analyzerand and selected area XRD analysis. Vickers microhardness tests for the weld carried out with a 10 s load time and a 200 g load. Tensile strength of the joints was measured by using universal testing machine.
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Optical microscopy
Scope Axio ZEISS
ZEISS
Studied the microstructure of joints
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CW laser
Used as the welding heat source
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Argon gas
Applied as a shielding gas
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Scanning electron microscope
S-3400
Studied the microstructure of joints with fast energy dispersion spectrum EDS analyzer
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XRD
X’Pert3 Powder
Selected area XRD analysis
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Universal testing machine
MTS Insight 10 kN
MTS
Measured the tensile strength of the joints
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Thermocouple
WRN-191 K
Temperature sensor
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