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Effect of shielding gas parameters on weld metal thermal properties in gas metal arc welding

Ley, F.H. and Campbell, Stuart and Galloway, Alexander and McPherson, Norman (2015) Effect of shielding gas parameters on weld metal thermal properties in gas metal arc welding. International Journal of Advanced Manufacturing Technology, 80 (5). pp. 1213-1221. ISSN 0268-3768

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Abstract

This study considered the effect of shielding gas parameters (composition, supply method and flow rate) on the post weld thermal properties (thermal expansion, specific heat capacity, thermal diffusivity and thermal conductivity) of the weld metal in gas metal arc welding. This is of importance as the thermal properties influences the temperature distribution and therefore the residual stresses and distortion present within the final structure. Due to the lack of accurate thermal data, computational modelling techniques (such as FEA, CFD, etc.) used for modelling the welding process generally make assumptions regarding the material thermal properties, and it is often the case that the parent material thermal properties are extended to the weld metal, introducing errors to the simulation. It was determined that the weld metal posses considerably different thermal properties to the DH36 grade steel parent material, and that the shielding gas parameters significantly alter key thermal properties of the solidified weld metal. A lower shielding gas flow rate exhibited beneficial properties including a lower thermal expansion, and higher specific heat capacity and thermal conductivity than a higher shielding gas flow rate.

Item type: Article
ID code: 52436
Keywords: GMAW, weld metal thermal properties, thermal expansion, specific heat, thermal diffusivity, thermal conductivity, Mechanical engineering and machinery, Mining engineering. Metallurgy, Mechanical Engineering, Mechanics of Materials, Industrial and Manufacturing Engineering, Metals and Alloys
Subjects: Technology > Mechanical engineering and machinery
Technology > Mining engineering. Metallurgy
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Depositing user: Pure Administrator
Date deposited: 01 Apr 2015 10:55
Last modified: 22 Feb 2019 05:53
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URI: https://strathprints.strath.ac.uk/id/eprint/52436
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