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Influence of Welding Techniques on Heat Affected Zone Softening of Dissimilar Metal Maraging Steel and High Strength Low Alloy Steel Gas Tungsten Arc Weldments

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Abstract

The present investigation reports on a study that has been taken up to understand and control the extent of softening in heat affected zone of dissimilar gas tungsten arc (GTA) welds of high strength steels: AISI 4130 steel and 18 % Ni maraging steel which are in hardened condition i.e., maraging steel in solution treated and aged condition and AISI 4130 steel in hardened and tempered condition before welding. The influence of welding technique on the width of soft zone and in-turn on the hardness has been investigated. All the dissimilar joints have been investigated for microstructures, microhardness and tensile properties. It is observed that continuous current GTA welding process results in a wider soft zone, leading to poor mechanical properties, which can be attributed to softer microstructural constituents.

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Acknowledgments

The authors are thankful to Dr. K. Jayaraman, Distinguished Scientist & Director, Defence Research and Development Laboratory (DRDL), Hyderabad for his continued encouragement and support to carry out this work. The authors are also grateful to the Director, National Institute of Technology (NIT), Warangal.

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Authors and Affiliations

  1. Defence Research and Development Laboratory, Kanchanbagh, Hyderabad, Telangana, 500058, India

    Jaiteerth R. Joshi, Mastanaiah Potta & Ramesh Kumar Katta

  2. National Institute of Technology, Warangal, Telangana, 502205, India

    Kumar Adepu

  3. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, Telangana, 500058, India

    Madhusudhan Reddy Gankidi

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  1. Jaiteerth R. Joshi
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  2. Mastanaiah Potta
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  3. Kumar Adepu
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  4. Madhusudhan Reddy Gankidi
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  5. Ramesh Kumar Katta
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Correspondence to Madhusudhan Reddy Gankidi.

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Joshi, J.R., Potta, M., Adepu, K. et al. Influence of Welding Techniques on Heat Affected Zone Softening of Dissimilar Metal Maraging Steel and High Strength Low Alloy Steel Gas Tungsten Arc Weldments. Trans Indian Inst Met 70, 69–81 (2017). https://doi.org/10.1007/s12666-016-0861-4

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  • DOI: https://doi.org/10.1007/s12666-016-0861-4

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