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The traditional low-voltage Electrical Resistance method of heat treatment uses ceramic blankets stepped down to 80 volts to provide a quick and convenient approach to many jobs, particularly preheat and Post-weld Heat Treatment (PWHT).
Advanced automated systems control and document welding preheat to reduce thermal stress in two primary ways. First, it drives off moisture that would release hydrogen that could penetrate the steel and cause porosity and subsequent cracking. Second, it reduces heat loss to the surrounding metal, minimizing the rate of weld hardening and allowing hydrogen that is present to escape.
Post-weld Heat Treatment
Carefully controlled PWHT is a crucial step in maximizing the life of your process equipment. PWHT tempers the metal and reduces tensile stresses, minimizing the risk of brittle fracture, stress, corrosion cracking and metal fatigue. This is especially important for equipment used in harsh service environments.
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