研究目的
Investigating the microstructure and mechanical properties of laser welding-brazing joints between TC4 titanium alloy and 304 stainless steel using 63Sn-37Pb alloy as filler metal, focusing on controlling the formation of Ti–Fe intermetallics.
研究成果
The study successfully demonstrated a laser welding-brazing process for joining TC4 Ti alloy to 304 SS using a Sn–Pb filler metal, achieving a joint with a maximum tensile strength of 108 MPa. The process effectively controlled the formation of Ti–Fe intermetallics by utilizing unmelted SS as a barrier.
研究不足
The study is limited by the specific materials and filler metal used, and the precise control required for laser spot positioning to avoid brittle Ti–Fe intermetallics formation.
1：Experimental Design and Method Selection:
Laser welding-brazing was applied with a laser beam offset to control the melting of SS and formation of a brazed weld at the SS-Ti alloy interface.
2：Sample Selection and Data Sources:
TC4 Ti alloy and 304 SS plates were used, cleaned, and prepared with a Sn–Pb alloy filler metal.
3：List of Experimental Equipment and Materials:
CW laser with specific parameters, argon gas for shielding, and a Sn–Pb alloy filler metal.
4：Experimental Procedures and Operational Workflow:
Laser beam was focused on the SS plate
5：4 mm away from the interface to create a joint with a fusion weld and a brazed weld separated by unmelted SS. Data Analysis Methods:
Microstructure analysis was performed using optical microscopy, SEM, EDS, and XRD. Mechanical properties were assessed through microhardness and tensile tests.
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