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<p>The aim of this study is to determine the possibility of recycling the tubular heat exchanger of the thermal power plant turbine system in situ by manual TIG welding. Tungsten inert gas arc welding (TIG) was performed to join the steel plate and brass tube by varying the welding current and arc offset and by using pure copper as a filler metal. The interface of the joint was characterized by microstructure, heat cycle and XRD analysis. At 70&#xa0;A welding current, there appeared no pore in the interface of the joint even at any arc offset. During the vertical-upward welding at the welding current of 80–120&#xa0;A, there appeared pores in the joint region located in the direction of 3-12-9 o’clock. The steel and brass were braze-welded all over the joint interface at the welding current of 70&#xa0;A. No cracks were observed in the joint interface after 300 times of heat cycle between 30℃ and 300℃. The results of XRD showed that the surface of the joint was copper with no intermetallic compound of copper and steel in the joint. A sound joint was formed when the arc was located towards steel to prevent zinc evaporation. The SEM analysis of the joints confirmed that the steel and brass were braze-welded.</p>

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Study on the TIG welding of brass to steel

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Tae-Hong Kim,
  • Dok-Su Paek,
  • Nam-Il Kim,
  • Tae-Min Ro,
  • Hyon-Nam Ryang

摘要

The aim of this study is to determine the possibility of recycling the tubular heat exchanger of the thermal power plant turbine system in situ by manual TIG welding. Tungsten inert gas arc welding (TIG) was performed to join the steel plate and brass tube by varying the welding current and arc offset and by using pure copper as a filler metal. The interface of the joint was characterized by microstructure, heat cycle and XRD analysis. At 70 A welding current, there appeared no pore in the interface of the joint even at any arc offset. During the vertical-upward welding at the welding current of 80–120 A, there appeared pores in the joint region located in the direction of 3-12-9 o’clock. The steel and brass were braze-welded all over the joint interface at the welding current of 70 A. No cracks were observed in the joint interface after 300 times of heat cycle between 30℃ and 300℃. The results of XRD showed that the surface of the joint was copper with no intermetallic compound of copper and steel in the joint. A sound joint was formed when the arc was located towards steel to prevent zinc evaporation. The SEM analysis of the joints confirmed that the steel and brass were braze-welded.