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This article presents a study on the metallographic characteristics of Laser-TIG welded butt joints made from trimetal composite materials, specifically copper alloy - carbon steel - copper alloy, fabricated via powder metallurgy. The analysis encompassed macroscopic examination of the weld’s cross-section and microscopic evaluation of three key regions: base metal (BM), heat affected zone (HAZ), and weld metal (WM), using optical and scanning electron microscopy, along with EDX analysis. The results indicate that the macroscopic structure predominantly developed within the copper alloy layers and partially within the central steel layer when using a laser power range of 1800 ÷ 2000 W. The microscopic structure of the WM region differed notably from the HAZ and BM regions due to the use of alloy steel welding wire.

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A Research on Metallographic Characteristic of Laser - TIG Welds Composite Trimetal Copper Alloy - Carbon Steel - Copper Alloy Made by Powder Metallurgy

  • 会议论文

  • 发表日期：

    2025年

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  • Minh Hung Ha,
  • Van Me Nguyen,
  • Thu Quy Le,
  • Trung Tuyen Vu,
  • Trong Binh Ngo,
  • Hoang Quan Nguyen

摘要

This article presents a study on the metallographic characteristics of Laser-TIG welded butt joints made from trimetal composite materials, specifically copper alloy - carbon steel - copper alloy, fabricated via powder metallurgy. The analysis encompassed macroscopic examination of the weld’s cross-section and microscopic evaluation of three key regions: base metal (BM), heat affected zone (HAZ), and weld metal (WM), using optical and scanning electron microscopy, along with EDX analysis. The results indicate that the macroscopic structure predominantly developed within the copper alloy layers and partially within the central steel layer when using a laser power range of 1800 ÷ 2000 W. The microscopic structure of the WM region differed notably from the HAZ and BM regions due to the use of alloy steel welding wire.