2007 Volume 47 Issue 10 Pages 1485-1490
A new heat source model for pulse MIG welding is developed which enables estimation of weld bead width and central penetration obtained with industrially pure Argon, Argon+5%, 25% CO2. The heat source model takes into account effects of various pulse current parameters such as pulse peak time, base time and mean current. Finite difference method with explicit time stepping technique is used to solve the two dimension Fourier's equation on non-uniform meshes generated by K-Method. Enthalpy method is used along with Kirchhoff variable transformation to solve the moving boundary problem. Relationship between enthalpy and temperature is used to include non-linear thermal properties of the material. The computed values of weld bead width and central penetration are within 8% and 5% of the experimental values respectively.
