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<p>For titanium/steel welding, the addition of welding wire can effectively reduce the formation of brittle intermetallic compounds in the joint, thereby improving the mechanical properties of the joint. TC4 tube/616 high-strength steel plate dissimilar metals corner joints were prepared using the MIG welding process with different welding wires in this research. The interfacial characteristics, microstructure, mechanical properties, and fracture mechanism of the joints were investigated. The results indicate that the interface of the joint changed from straight to curved, and the thickness of the transition zone gradually increased with the addition of other elements in pure Cu wire. The addition of Si and Al effectively suppressed the generation of brittle Ti-Fe intermetallic compounds. However, more dispersive TiSi<sub>2</sub> with poor mechanical properties was generated in the joint with CuSi3 wire. In the joint with CuAl8, AlCu<sub>2</sub>Ti phases strengthened the joint with CuAl8 wire, with a shear load of 44.1&#xa0;kN. The joint with CuAl8 wire presented ductile–brittle mixed fracture, while the other two types of joints exhibited complete brittle fracture.</p>

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Influence of Different Welding Wires on the MIG Corner Joint Between TC4 Alloy and 616 High-Strength Steel

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Bingzhi Wang,
  • Wenjing Yang,
  • Peng Li,
  • Zhiwei Qin,
  • Honggang Dong

摘要

For titanium/steel welding, the addition of welding wire can effectively reduce the formation of brittle intermetallic compounds in the joint, thereby improving the mechanical properties of the joint. TC4 tube/616 high-strength steel plate dissimilar metals corner joints were prepared using the MIG welding process with different welding wires in this research. The interfacial characteristics, microstructure, mechanical properties, and fracture mechanism of the joints were investigated. The results indicate that the interface of the joint changed from straight to curved, and the thickness of the transition zone gradually increased with the addition of other elements in pure Cu wire. The addition of Si and Al effectively suppressed the generation of brittle Ti-Fe intermetallic compounds. However, more dispersive TiSi2 with poor mechanical properties was generated in the joint with CuSi3 wire. In the joint with CuAl8, AlCu2Ti phases strengthened the joint with CuAl8 wire, with a shear load of 44.1 kN. The joint with CuAl8 wire presented ductile–brittle mixed fracture, while the other two types of joints exhibited complete brittle fracture.