OPTIMUM HEAT INPUT CONTROL IN ARC-WELDING OF STEEL AND ALUMINUM PIPE

A simple mathematical method for the determination of the optimum heal input condition to control the temperature field in are welding was d iscussed in the first part of this paper, where an analytical model of heat conduction was used to evaluate the temperature held during weld ing on thin plate and pipe specimens and the non-linear programming me thod was applied to estimate the optimum heat input pattern for a requ ired temperature field. In the second part, the optimum heat input pat tern, derived from the above optimizing algorithm, was applied to a ci rcumferential pipe welding with GTA(Gas Tungsten Are). As a result of the comparison between the experimental and required temperature field s, it was concluded that the optimizing method proposed in this paper is available for determining the optimum heat input pattern of the are welding process on pipe specimens.