Temperature Field of Double-Sided Asymmetrical MAG Backing Welding for Thick Plates

A double elliptic distribution model of moving heat-source was used to double-side asymmetrical MAG backing welding of thick plate, and a 3-D non-linear FEM analysis model was established based on ABAQUS software. The transient temperature of different arc distance was calculated. To verify the numerical results, the temperature was measured and the calculated results agree approximately with experimental data. Farther, the effect of arc distance on temperature field and weld pool size was discussed. The results show that the arc distance will influence the distribution of temperature field and the weld shape. The arc distance is a very important factor to affect the quality of double-side asymmetrical MAG backing welding of thick plate.