Abstract
This paper proposed an analytical model for describing the temperature field of multi-pass arc weld surfacing. The temperature field is described analytically assuming a bimodal volumetric model of the heat source and a semi-infinite body model of the (rebuilt) workpiece. The suggested analytical solution takes into account the temperature changes caused not only by the direct heat of an electric arc, but also by the heat of the applied weld (melted metal of electrode). The solution considers temperature increments caused by overlaying consecutive welding sequences and by self-cooling of areas previously heated. Computations of the temperature field are carried out during the multi-pass gas metal arc welding (GMAW) surfacing of a steel plate. The results are presented in the form of transient and maximum (achieved in whole welding process) temperature distributions in the element’s cross-section, as well as thermal cycles at the selected point.
Highlights
In the case of multi-pass surfacing, the application of subsequent welds causes previous welds to heat up and melt
Bo and Cho [6] derived an analytical solution for transient temperature field in finite thickness plate during single-pass arc welding, assuming Gaussian distribution of heat source
An analytical solution for temporary temperature field of fillet weld has been presented by Jeong and Cho [7] and wasapplied by Fassani and Trevisan [8] to compare the thermal cycles during multi-pass gas metal arc welding (GMAW) which was computed for Rosenthal’s models of point heat sources and one-dimensional (1D) Gaussian
Summary
In the case of multi-pass surfacing, the application of subsequent welds causes previous welds to heat up and melt. Bo and Cho [6] derived an analytical solution for transient temperature field in finite thickness plate during single-pass arc welding, assuming Gaussian distribution of heat source. An analytical solution for temporary temperature field of fillet weld has been presented by Jeong and Cho [7] and wasapplied by Fassani and Trevisan [8] to compare the thermal cycles during multi-pass gas metal arc welding (GMAW) which was computed for Rosenthal’s models of point heat sources and one-dimensional (1D) Gaussian. It is difficult to find work presenting an analytical description of the temperature field during multi-pass welding induced by different point models of a heat source and the actual technological parameters of the process. This approach brings the model closer to the real phenomena occurring in the welding process
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