Heat Treatment & Stress Relief
Our heat treatment and stress relief technicians are professional and highly experienced. They understand the quality of the service they deliver is the difference between incidents and unplanned downtime, and integrity and continued operations. We provide heat treatment that is used to relax welds and adjacent base metal. This prevents the materials from becoming brittle and increases resistance to stress corrosion cracking and hydrogen-induced cracking, which can be caused by high levels of hydrogen released during the welding process.
Our heat treatment & stress relief services include
- Electrical Resistance
Applications for Heat Treatment & Stress Relief
After welding, the material (particularly HAZ) gets harder, and excess hardness is nearly useless for a particular service application. Post-weld heat treatment (PWHT) is the best tool to avoid this and is primarily used by many industries to temper the hard heat-affected zone. It builds strong protection and provides adequate resistance against brittle fracture failure during service.
Residual stresses during welding may occur due to high thermal gradient. During the thermal cycle of the welding process, expansion happens in some areas while cooling, and a localized contraction may occur. Both of these can produce undesirable residual stresses. In order to reduce the level of these stresses, thermal treatment is applied, which involves baking the material (by uniform heating) at a specific temperature and then brought back to ambient temperature at a particular cooling rate.
Prevention of Stress Corrosion Cracking (SCC)
PWHT helps prevent stress corrosion cracking. Stress corrosion cracking is referred to as SCC, which occurs when present cracks intensify in the material due to applied stress or load.
Ease in Machining
Post-weld thermal treatment tends to reduce the degree of hardness, so the welded components can easily be machined to required dimensional conditions. Softening welded parts allows for easy grinding, machining, and other surface treatments.
Prevention of Brittle Fracture
The primary role of post-weld heat treatment is to improve the weldment’s mechanical characteristics and make it outlast for particular service conditions. PWHT helps to reduce the residual stress level and hardness, achieving the required level of ductility in the weldments. This improves strength and resistance to brittle fracture and increases the material’s lifespan.
Additional Service Lines
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