THE INFLUENCE OF WELDING CURRENTS ON THE MECHANICAL AND PHYSICAL PROPERTIES OF CHROMIUM-MOLYBDENUM STEEL

Authors

  • M. S. Kaiser Directorate of Advisory, Extension and Research Services, Bangladesh University of Engineering and Technology, Dhaka- 1000
  • K. M. Shorowordi Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka- 1000

DOI:

https://doi.org/10.3329/jme.v44i1.19493

Keywords:

Chromium-Molybdenum steel, heat affected zone, microstructure, micro hardness, post-weld heat treatment

Abstract

An attempt has been made to determine the strength and impact properties of Cr-Mo steel base metal and joints welded by varying the current during manual metal arc welding. A set of sample is heat treated at 650°C for 2 hours and cooled in furnace to room temperature. Microstudy of the welded Cr-Mo steels is performed to make relationship with properties. Microhardness and hardness are measured at different locations viz., base metal, heat affected zone (HAZ) and weld deposit. Toughness over a temperature range from -32 to 100°C of three zones at three current settings is measured. It is found that toughness of all three zones at -32°C is almost same for any current settings. The toughness at HAZ area are higher than that of deposited weld area due to the coarsening of ferrite grain of HAZ occurs with higher heat input. The hardness and tensile properties of three zones with different welding current is also discussed.

DOI: http://dx.doi.org/10.3329/jme.v44i1.19493

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Published

2014-07-13

How to Cite

Kaiser, M. S., & Shorowordi, K. M. (2014). THE INFLUENCE OF WELDING CURRENTS ON THE MECHANICAL AND PHYSICAL PROPERTIES OF CHROMIUM-MOLYBDENUM STEEL. Journal of Mechanical Engineering, 44(1), 18–22. https://doi.org/10.3329/jme.v44i1.19493

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