Scholarlink

<p>This study focuses on the complex welding challenges associated with 2000a series alloys, particularly their vulnerability to softening due to precipitate dissolution. Specifically, the investigation examines AA2099-T86 alloy joints using ER4047 (Si-rich) filler wire, employing the Cold Metal Transfer (CMT) welding method, and analyzes the effects of welding current, welding speed, and contact tip-to-workpiece distance as input parameters. Employing optical microscopy, Field Emission Scanning Electron Microscopy (ESEM), and X-ray diffraction (XRD) techniques, the welded samples are thoroughly scrutinized. FESEM images reveal a ductile failure mode characterized by a pronounced dimpled morphology on the fractured surfaces, resulting in an enhanced percentage elongation and improved weld joint efficiency. Notably, welding current emerges as the primary process parameter, with welding speed and contact tip-to-workpiece distance also exerting significant influence on mechanical properties. Taguchi and ANOVA analyses confirmed that welding current was the dominant parameter, with an optimal setting predicting a tensile strength of 302&#xa0;MPa and a hardness of 118&#xa0;HV. Additionally, compared to the base metal, reductions of approximately 8.35% and 1.22% in microhardness values are observed in the weld bead zone and heat-affected zone, attributed to the formation of elongated dendritic grain structures and material softening during welding.</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

Influence of Welding Parameters on Microstructure and Mechanical Properties of 2099-T86 Aluminum Alloy Joints Fabricated by Cold Metal Transfer Welding

  • 期刊论文

  • 发表日期：

    2026年6月2日

查看全文
  • Satyaveer Singh,
  • Rajendra Prasad,
  • N. Yuvaraj,
  • Tapas Bajpai

摘要

This study focuses on the complex welding challenges associated with 2000a series alloys, particularly their vulnerability to softening due to precipitate dissolution. Specifically, the investigation examines AA2099-T86 alloy joints using ER4047 (Si-rich) filler wire, employing the Cold Metal Transfer (CMT) welding method, and analyzes the effects of welding current, welding speed, and contact tip-to-workpiece distance as input parameters. Employing optical microscopy, Field Emission Scanning Electron Microscopy (ESEM), and X-ray diffraction (XRD) techniques, the welded samples are thoroughly scrutinized. FESEM images reveal a ductile failure mode characterized by a pronounced dimpled morphology on the fractured surfaces, resulting in an enhanced percentage elongation and improved weld joint efficiency. Notably, welding current emerges as the primary process parameter, with welding speed and contact tip-to-workpiece distance also exerting significant influence on mechanical properties. Taguchi and ANOVA analyses confirmed that welding current was the dominant parameter, with an optimal setting predicting a tensile strength of 302 MPa and a hardness of 118 HV. Additionally, compared to the base metal, reductions of approximately 8.35% and 1.22% in microhardness values are observed in the weld bead zone and heat-affected zone, attributed to the formation of elongated dendritic grain structures and material softening during welding.