The quality of the product that is manufactured via a welding process depends on certain characteristics of the joint which are determined by the temperature field created from the heat source. Consequantly, control of the temperature distribution in a joint during welding is essential to ensure reliable good quality welds. However, traditional welding methods do not provide enough flexibility to achieve complete control of this temperature field. This paper suggests a redesign of the welding process with an innovative technique, in which the heat source moves in a reciprocating fashion between two points or in a scanning fashion above the entire workpiece surface to provide the necessary amount of heat at each point. Creation of the temperature field using this method allows the decoupled control of the process. Analytical, numerical and experimental models have been used for modeling the process and multivarible adaptive and distributed-parameter controllers have been designed and tested in seam pipe welding experiments.
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