Theoretical Analysis of Weld Pool Behavior in the Pulsed Current GTAW Process

Abstract

A general, three-dimensional, closed-form welding heat-flow solution, which is capable of analyzing thermal behavior of the weldment in its transient state and/or under time-dependent power change during welding, is presented. The analytical model utilizes the finite heat source theory with a Gaussian distribution and also considers the effects of finite plate thickness. The numerical values of the solution are calculated using the computational schemes on a minicomputer. In this paper the welding parameters of the pulsed current GTAW were studied using the solution. Two sets of pulsation parameters were analyzed and their sensitivity to the heat input control were evaluated.