Abstract
The development/modification and qualification of welding technology for generating compressive stresses in austenitic stainless steel piping welds are discussed. The following welding processes are considered: 1. A modified, orbital gas tungsten arc (GTA) narrow-gap welding process with significant improvements over conventional and standard narrow-gap orbital pipe welding, 2. The heat sink welding (HSW) process with internal cooling of the pipe with water or liquefied CO 2 gas, and 3. The postwelding process. Last pass heat sink welding (LPHSW) for altering residual stresses in an existing weld. Residual stresses have been measured by using the so-called ring-core as well as radiographic procedures. In support of experimental work required to qualify these welding techniques a numerical simulation effort was undertaken.
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