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<p>Cold metal transfer (CMT) welding of SS304L sheets was carried out at different heat inputs of 70, 93, 124, and 141&#xa0;J/mm. The size of the weld pool was found to be increased with increase in heat input of welding. However, the heat-affected zone (HAZ) was insignificant in all the samples after welding. The base metal (BM) had uniform austenite grains with significant number of twins, whereas the fusion zones (FZs) consisted of a fully dendritic structure with both austenite and ferrite (δ-ferrite) grains. The δ-ferrites were observed inside austenite grains as well as along the grain boundaries. The fusion zones exhibited highest micro-hardness values irrespective of the welding conditions. The welded samples had higher tensile strength and higher corrosion resistance as compared to the base metal which may be attributed to the presence of δ-ferrites in the weld pools. Compressive residual stresses were observed in the samples after CMT welding.</p>

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Improvement in Mechanical and Corrosion Properties of SS304L Sheets through Cold Metal Transfer Welding

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Parth Patel,
  • S. Basak,
  • S. K. Karak,
  • A. Ghosh,
  • S. K. Sahoo

摘要

Cold metal transfer (CMT) welding of SS304L sheets was carried out at different heat inputs of 70, 93, 124, and 141 J/mm. The size of the weld pool was found to be increased with increase in heat input of welding. However, the heat-affected zone (HAZ) was insignificant in all the samples after welding. The base metal (BM) had uniform austenite grains with significant number of twins, whereas the fusion zones (FZs) consisted of a fully dendritic structure with both austenite and ferrite (δ-ferrite) grains. The δ-ferrites were observed inside austenite grains as well as along the grain boundaries. The fusion zones exhibited highest micro-hardness values irrespective of the welding conditions. The welded samples had higher tensile strength and higher corrosion resistance as compared to the base metal which may be attributed to the presence of δ-ferrites in the weld pools. Compressive residual stresses were observed in the samples after CMT welding.