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<p>Ti/steel bimetallic sheets have a wide range of applications across various fields. However, significant challenges arise in welding these sheets due to the emergence of brittle Fe-Ti intermetallic compounds. In this paper, a multi-principal filler wire composed of Ni-Co-Al and two types of groove angles were designed to finish the welding of the bimetallic sheets. The study examined the effects of different groove angles and the titanium content present in the weld zone on the microstructure and mechanical properties of the welded joints. It was found that the groove angle has an impact on the elemental composition, microstructure, and mechanical properties of the welded joints in Ti/steel bimetallic sheets using multi-principal filler wires. The welded joint with a groove angle of 90° significantly reduced the titanium content, resulting in decreased hardness and a marked increase in tensile strength, achieving a value of 275&#xa0;MPa compared to the welded joint with a 40° groove angle, which exhibited a tensile strength of 123&#xa0;MPa.</p>

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Effect of Groove Angle on Microstructure and Mechanical Properties of the Ti/Steel Bimetallic Joints Using Multi-Principal Filler Wire

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Shanguo Han,
  • Nianlong Xue,
  • Zhe Ma,
  • Weixiong Wang,
  • Dejia Liu

摘要

Ti/steel bimetallic sheets have a wide range of applications across various fields. However, significant challenges arise in welding these sheets due to the emergence of brittle Fe-Ti intermetallic compounds. In this paper, a multi-principal filler wire composed of Ni-Co-Al and two types of groove angles were designed to finish the welding of the bimetallic sheets. The study examined the effects of different groove angles and the titanium content present in the weld zone on the microstructure and mechanical properties of the welded joints. It was found that the groove angle has an impact on the elemental composition, microstructure, and mechanical properties of the welded joints in Ti/steel bimetallic sheets using multi-principal filler wires. The welded joint with a groove angle of 90° significantly reduced the titanium content, resulting in decreased hardness and a marked increase in tensile strength, achieving a value of 275 MPa compared to the welded joint with a 40° groove angle, which exhibited a tensile strength of 123 MPa.