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<p>The study of residual stress, hardness and thrust force around drilled holes in AISI 1020 mild steel welded joints is a challenging task due to the combined effect of heat from welding and mechanical energy from drilling involved in the welded joints. In this work, Shielded Metal Arc Welding (SMAW) is carried out on AISI 1020 mild steel to study the residual stress, hardness and generated thrust force with varying the preheating temperatures (50&#xa0;°C, 60&#xa0;°C, 70&#xa0;°C, and 80&#xa0;°C), electrode materials (E6013, E7018, E6011, and E7016) and post weld heat treatment temperatures (600&#xa0;°C, 630&#xa0;°C, 650&#xa0;°C, and 680&#xa0;°C). After welding, the circular holes with 10&#xa0;mm and 6&#xa0;mm diameter twist drill are made in the welded joint. The analysis found that the residual stress decreased with increasing preheating temperature due to reduced thermal gradients. Hardness reduced gradually, indicating softer microstructure formation. Thrust force decreased, improving machinability. Uniform heat distribution reduces stress concentration around holes. Overall, higher preheating improved weld quality and performance.</p>

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Combined Effect of Preheating, Electrode Type and Post Weld Heat Treatment on Mechanical Behaviour Around Drilled Holes in Welded AISI 1020 Steel

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • S. Karthick,
  • S. Vijayan,
  • C. Franklin,
  • D. Raj Kumar

摘要

The study of residual stress, hardness and thrust force around drilled holes in AISI 1020 mild steel welded joints is a challenging task due to the combined effect of heat from welding and mechanical energy from drilling involved in the welded joints. In this work, Shielded Metal Arc Welding (SMAW) is carried out on AISI 1020 mild steel to study the residual stress, hardness and generated thrust force with varying the preheating temperatures (50 °C, 60 °C, 70 °C, and 80 °C), electrode materials (E6013, E7018, E6011, and E7016) and post weld heat treatment temperatures (600 °C, 630 °C, 650 °C, and 680 °C). After welding, the circular holes with 10 mm and 6 mm diameter twist drill are made in the welded joint. The analysis found that the residual stress decreased with increasing preheating temperature due to reduced thermal gradients. Hardness reduced gradually, indicating softer microstructure formation. Thrust force decreased, improving machinability. Uniform heat distribution reduces stress concentration around holes. Overall, higher preheating improved weld quality and performance.