Effects of welding currents on microstructure and corrosion behaviors of Inconel 625 cladding on 2.25Cr-1Mo steel by Hot-wire TIG

Supparat SAEHENG; Hein Zaw OO; Prapas  MUANGJUNBUREE

doi:10.55713/jmmm.v36i1.2422

ผู้แต่ง

Supparat SAEHENG Department of Mining and Materials Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand
Hein Zaw OO Department of Mining and Materials Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand
Prapas MUANGJUNBUREE Department of Mining and Materials Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand

DOI:

https://doi.org/10.55713/jmmm.v36i1.2422

คำสำคัญ:

2.25Cr-1Mo steel, Inconel 625, Hot-wire TIG, Cladding, Corrosion behaviors

บทคัดย่อ

Hot-wire tungsten inert gas (HW-TIG) cladding has been applied to the steam turbine rotor welding repair. This study investigated the effects of welding currents on microstructure, hardness, and corrosion behavior. The experiments were conducted using four different welding currents applied to bead-on-plate Inconel 625 welds on a 2.25Cr-1Mo steel substrate as the steam turbine rotor material. The selected welding currents were 125 A, 150 A, 175 A, and 200 A. The percentages of weld dilution for different welding currents were also evaluated. Higher welding currents increased weld dilution, weld bead width, and HAZ size. As the welding current increased, the nickel alloy weld metal became more diluted with the base metal. The microstructure of the weld metal was a dendritic austenite phase. The weld metal exhibited the highest hardness at 150 A, with an average of 240 HV_0.2. And the lowest hardness at 200 A, with an average of 195 HV_0.2. The electrochemical corrosion test performed in a 3.5% NaCl solution showed that the corrosion rate was lowest in the weld metal at 150 A. According to the analytical results, a welding current of 150 A was found to be the most suitable for repairing steam turbine rotors using the HW-TIG process.

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