Delta Heat Services is a specialist in heat treatment services on site. With our flexible approach and high quality services we can manage mayor turn arounds and new build projects in the petrochemical industry to large constructions works. We are specialised in preheat, annealing, post weld heat treatment, bake outs, dry outs and shrink fittings.
Preheat is done to raise the temperature of the parent steel before and during the welding process. This is done to slowdown the cooling rate of the weld and the base material to avoid expanding and shrinking of the heat effected zone. Resulting in a better weld metal and the heat affected zone microstructures with a much greater resistance to hydrogen cracking.
Post Weld heat treatment (PWHT) is done after the welding process to improve the properties of the weld. Depending on the material and usage of the workpiece we work with different heat treatment procedure according to ASME standards.
During the welding process a high temperature is experienced in the weld metal and the parent metals. When the welds cools residual tress is formed. When the PWHT process is done to a certain temperature for a given moment of time to reduce these stresses to an acceptable level. Also is helps to reduce any increased hardness levels and improves toughness and ductility to an acceptable level.
At Delta Heat Services, it’s possible to both purchase and rent heat treatment equipment. Choose between electrical equipment and induction equipment.