NUMERICAL DYNAMIC ANALYSIS OF MOVING GTA WELD POOL

A three dimensional model with a moving heat source is developed to de scribe heat transfer and fluid flow in transient weld pools. Full pene tration and free top and bottom surfaces are incorporated in the model in order to simulate the welding process more practically. The influe nce of plate thickness and welding current on the dynamics of weld poo ls is analyzed using calculated data. It is shown that when the workpi ece is nearly penetrated, the depth of weld pool increases quickly. Al so, the elevation of the top surface decreases quickly once the full p enetration status is established.