Scholarlink

<p>Friction-stir-welded (FSW) 2219 aluminum alloy structures used in large rocket tanks suffer strength degradation because strengthening precipitates dissolve in the weld zone, while conventional full-component aging is difficult to implement at large scale. In this work, Electromagnetic Induction Heating Pulsation Aging (EIHPA) was adopted as a localized post-weld treatment for thick 2219 FSW joints. A rotating EIHPA platform was constructed using a 2600-mm-diameter, 18-mm-thick aluminum disk containing a representative weld, and a coupled electromagnetic-thermal finite-element model was established and validated against thermocouple measurements at the weld centerline to describe the temperature field during pulsation aging. Based on this model, the influences of induction frequency, current, coil-workpiece gap and rotation speed on the weld peak temperature and through-thickness temperature gradient were quantified, and a set of process parameters was identified that keeps the weld within an appropriate aging temperature range. Under the selected condition, the weld tensile strength increased from 335.7 to 351.8 MPa, the nugget-zone hardness showed a pronounced recovery, and transmission electron microscopy revealed re-precipitation of fine Cu-rich θ″ phases in the nugget. These results indicate that, under constraints relevant to large aluminum structures, EIHPA can effectively strengthen thick 2219 FSW welds. They further show that EIHPA provides an engineering-feasible route for localized post-weld aging in situations where conventional furnace treatment cannot be applied.</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

Electromagnetic induction heating pulsation aging for large friction stir welded 2219 aluminum structures: experiments and simulation

  • 期刊论文

  • 发表日期：

    2026年5月5日

查看全文
  • Fei Xue,
  • Feng Nie,
  • Diqiu He,
  • Haibo Zhou,
  • Liyang Xiao,
  • Huilin Miao

摘要

Friction-stir-welded (FSW) 2219 aluminum alloy structures used in large rocket tanks suffer strength degradation because strengthening precipitates dissolve in the weld zone, while conventional full-component aging is difficult to implement at large scale. In this work, Electromagnetic Induction Heating Pulsation Aging (EIHPA) was adopted as a localized post-weld treatment for thick 2219 FSW joints. A rotating EIHPA platform was constructed using a 2600-mm-diameter, 18-mm-thick aluminum disk containing a representative weld, and a coupled electromagnetic-thermal finite-element model was established and validated against thermocouple measurements at the weld centerline to describe the temperature field during pulsation aging. Based on this model, the influences of induction frequency, current, coil-workpiece gap and rotation speed on the weld peak temperature and through-thickness temperature gradient were quantified, and a set of process parameters was identified that keeps the weld within an appropriate aging temperature range. Under the selected condition, the weld tensile strength increased from 335.7 to 351.8 MPa, the nugget-zone hardness showed a pronounced recovery, and transmission electron microscopy revealed re-precipitation of fine Cu-rich θ″ phases in the nugget. These results indicate that, under constraints relevant to large aluminum structures, EIHPA can effectively strengthen thick 2219 FSW welds. They further show that EIHPA provides an engineering-feasible route for localized post-weld aging in situations where conventional furnace treatment cannot be applied.