Indian Welding Journal

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Identification and Assessment of the HAZ Softening and Hardening Phenomena for Submerged Arc Welding Process for Structural Steel Plates


Affiliations
1 Department of Mechanical Engg. Govt Engineering College, Kalyani, W.B,, India
2 MECON India Ltd., Ranchi, India
3 Department of Mechanical Engg. & Mining Machinery Engg., Indian School of Mines, University, Dhanbad, India
     

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Submerged Arc Welding (SAW) process has lot of social and economical implication. Critical set of variables are involved in this process, and they are needed to be controlled. An attempt has been made in this paper to find out- the influence of the heat input on HAZ hardness (change of hardness & microstructure) for Submerged Arc Welding Process of Mild steel plates. Mild steel plates are welded by changing input variables (current, voltage, trolley speed, i.e. heat input) and Rockwell hardness No. on different grid points (points are taken horizontally & vertically 2 mm apart) of welded surface and at the zone adjacent to the welded portion has been observed. A detailed analysis of the microstructure changes is carried out to understand the HAZ softening phenomenon.


Keywords

SAW, HAZ Hardness, Rockwell Hardness No., Microstructure, Grain Growth.
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  • Identification and Assessment of the HAZ Softening and Hardening Phenomena for Submerged Arc Welding Process for Structural Steel Plates

Abstract Views: 315  |  PDF Views: 5

Authors

A. Ghosh
Department of Mechanical Engg. Govt Engineering College, Kalyani, W.B,, India
S. Mukherjee
MECON India Ltd., Ranchi, India
G. Vinamra
Department of Mechanical Engg. & Mining Machinery Engg., Indian School of Mines, University, Dhanbad, India
A. Kumar
Department of Mechanical Engg. & Mining Machinery Engg., Indian School of Mines, University, Dhanbad, India
P. K. Rai
Department of Mechanical Engg. & Mining Machinery Engg., Indian School of Mines, University, Dhanbad, India
S. Chattopadhyaya
Department of Mechanical Engg. & Mining Machinery Engg., Indian School of Mines, University, Dhanbad, India
P. K. Sarkar
Department of Mechanical Engg. & Mining Machinery Engg., Indian School of Mines, University, Dhanbad, India

Abstract


Submerged Arc Welding (SAW) process has lot of social and economical implication. Critical set of variables are involved in this process, and they are needed to be controlled. An attempt has been made in this paper to find out- the influence of the heat input on HAZ hardness (change of hardness & microstructure) for Submerged Arc Welding Process of Mild steel plates. Mild steel plates are welded by changing input variables (current, voltage, trolley speed, i.e. heat input) and Rockwell hardness No. on different grid points (points are taken horizontally & vertically 2 mm apart) of welded surface and at the zone adjacent to the welded portion has been observed. A detailed analysis of the microstructure changes is carried out to understand the HAZ softening phenomenon.


Keywords


SAW, HAZ Hardness, Rockwell Hardness No., Microstructure, Grain Growth.