Scholarlink

<p>Ultrasonic welding of titanium to steel is important in medical and aerospace applications, but remains challenging due to the significant differences in their physical properties. In this study, ultrasonic welding was used to join 0.3&#xa0;mm-thick titanium and St12 steel sheets, with aluminum interlayers of 10, 50, and 100&#xa0;μm. After preparation, the microstructure of the weld interface was analyzed by optical microscopy, while mechanical properties were evaluated through shear-tensile and microhardness tests. Reducing the interlayer thickness from 100 to 10&#xa0;μm decreased heat dissipation, raised the interface temperature, and consequently increased the grain size, with the steel grain size rising from 7 to 19.5&#xa0;μm. As a result, the weld line density increased from 62% to 83.5%, while weld thickness decreased from 235 to 194&#xa0;μm due to enhanced material flow. Increasing the aluminum interlayer thickness generally enhanced the maximum shear-tensile force, raising it from 605 to 825 N when the thickness increased from 10 to 50&#xa0;μm. This improvement is attributed to the formation of a wavy interface, which provides mechanical interlocking. Conversely, local ruptures of the aluminum interlayer and direct contact between titanium and steel reduced the shear-tensile strength of the 10&#xa0;μm-thick samples. In all conditions, hardness measurements indicated lower values for both titanium and steel near the weld center due to elevated peak temperatures. In contrast, hardness increased with increasing distance from the joint interface. For 10&#xa0;μm sample, the titanium hardness rose from 141.5 to 183.5 HV, and St12 from 135.5 to 157.5 HV.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of aluminum interlayer thickness in ultrasonic welding of titanium to low-carbon steel

  • 期刊论文

  • 发表日期：

    2026年4月27日

查看全文
  • Ali Mojaverpour,
  • Tohid Saeid,
  • Farid Bashirzadeh

摘要

Ultrasonic welding of titanium to steel is important in medical and aerospace applications, but remains challenging due to the significant differences in their physical properties. In this study, ultrasonic welding was used to join 0.3 mm-thick titanium and St12 steel sheets, with aluminum interlayers of 10, 50, and 100 μm. After preparation, the microstructure of the weld interface was analyzed by optical microscopy, while mechanical properties were evaluated through shear-tensile and microhardness tests. Reducing the interlayer thickness from 100 to 10 μm decreased heat dissipation, raised the interface temperature, and consequently increased the grain size, with the steel grain size rising from 7 to 19.5 μm. As a result, the weld line density increased from 62% to 83.5%, while weld thickness decreased from 235 to 194 μm due to enhanced material flow. Increasing the aluminum interlayer thickness generally enhanced the maximum shear-tensile force, raising it from 605 to 825 N when the thickness increased from 10 to 50 μm. This improvement is attributed to the formation of a wavy interface, which provides mechanical interlocking. Conversely, local ruptures of the aluminum interlayer and direct contact between titanium and steel reduced the shear-tensile strength of the 10 μm-thick samples. In all conditions, hardness measurements indicated lower values for both titanium and steel near the weld center due to elevated peak temperatures. In contrast, hardness increased with increasing distance from the joint interface. For 10 μm sample, the titanium hardness rose from 141.5 to 183.5 HV, and St12 from 135.5 to 157.5 HV.