Effect of weld cooling rates on mechanical and metallurgical properties of submerged arc welded pressure vessel steel

[+] Author and Article Information
harish Arya

Assistant Professor, Sant Longowal Institute of Engineering & Technology, Longowal (Sangrur) INDIA

Kulwant Singh

Professor, Sant Longowal Institute of Engineering & Technology, Longowal (Sangrur) INDIA

Ravindra k. Saxena

Professor, Sant Longowal Institute of Engineering & Technology, Longowal (Sangrur) INDIA

1Corresponding author.

ASME doi:10.1115/1.4040274 History: Received November 24, 2017; Revised May 08, 2018


Submerged arc welding of SA 516 grade 60 pressure vessel grade steel was conducted with different heat plate thicknesses and the influence of cooling rate on microstructure, Vickers hardness and impact toughness of heat affected zone (HAZ) of weldment were systematically investigated. Weld Cooling rates varies with change in heat input or variation in plate thickness of base metal. Results showed that thin plates accumulate the heat, which cause grain coarsening and loss of acicular ferrite microstructure, which further responsible for lower impact strength of welded joint. It is deemed that faster cooling rates due to heat sink in thickness direction with thick plates cause high percentage of acicular ferrite with finer grain and enhanced hardness values. Improved impact strength with thick plates with same heat input signify that supplying heat more than required to thin plates may cause microstructural deterioration and responsible for impact strength loss of weldments. Test demonstrate that heat affected zone cooling rate should be above 15 ? C/sec to kept impact strength loss within considerable limits.

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