Analytical thermal model of conduction mode double sided arc welding

Abstract

An analytical thermal model of conduction mode double sided arc welding (DSAW) has been derived and used to predict the weld pool dimensions and shapes and temperatures within 2?5 and 1?15 mm thick AA5182 Al alloy sheets as functions of the primary DSAW parameters. Separate Gaussian distributed arc heat sources from a plasma arc welding and gas tungsten arc welding torch were assumed to act on the top and bottom surfaces of the sheets. There was excellent correlation between observed and predicted DSAW weld pool dimensions and shapes provided that suitable values for arc efficiencies and distribution coefficients for the two separate arcs were used in the model. The model is capable of predicting weld pool dimensions and shapes of both full and partial penetration conduction mode DSAW welds made in Al alloy sheet, the welding speed at which there is a transition from full to partial penetration welding and the speed above which no melting occurs.

A kind of analytical model of arc welding temperature distribution under varying material properties

“…The 2D Gaussian heat source was widely used later. Kwon et al [11] treated the welding heat source as two gauss heat sources when computing double side arc welding temperature field of aluminum alloy and obtained better forecast using an aluminum sheet thickness limited to 1.15-2.5 mm. The model of double ellipsoidal 3D heat source was primarily introduced by Goldak et al [12] in 1985.…”

“…The researchers mentioned above [10][11][12][13][14][15] tried to improve the accuracy of the analytical models by modifying heat source and boundary conditions, but they did not consider varying the properties of the materials. However, a great temperature gradient in the welding process led to a great change in the material properties such as thermal conductivity, density, and specific heat.…”

Modeling of Temperature Field during Multi-Pass GMAW Surfacing or Rebuilding of Steel Elements Taking into Account the Heat of the Deposit Metal

“…In the analytical solutions, the influence of phase transformation heat (both solid and liquid) is generally ignored, thermo-physical properties of the material are assumed to be independent of temperature, and only the conduction effect is taken into consideration (the radiation phenomenon and the gravity field are omitted), also Joule heat (for electric arc welding) is omitted [6][7][8][9][10][11][12][13][14][53][54][55][56][57][58]. Such assumptions were also adopted in this work.…”

“…On the other hand, the solution of the temperature field in a massive body caused by a half-elliptical double-ellipsoidal volumetric heat source has been presented by Nguyen et al [9]. Kwon and Weckman [10] carried out the thermal analysis in double-sided arc welding of an aluminum alloy plate. Ghosh at al.…”

The model of temporary temperature field during multi-pass arc weld surfacing. Part I: Analitycal description

“…The model of double ellipsoidal, three-dimensional heat source was first introduced by Goldak et al [1]. Since then many researchers have tried to determine the temperature field closest to real distribution using analytical methods [17][18][19][20][21].…”