Post Weld Heat Treatment Jobs

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Post weld heat treatment (PWHT) is often required by codes for materials over a certain thickness, usually to meet service requirements or prevent changes caused by cooling too quickly.

Utilizing and overseeing PWHT equipment. Assembling and providing temperature charts of PWHT equipment to quality personnel and management.

Kvalifikatsioonid

PWHT technicians specialize in preheating and postweld heat treatments on pipes and equipment, which includes preheating the weld area before setting up all leads to heat stress equipment, monitoring preheat charts and providing documentation to quality personnel and management. PWHT techs ensure their equipment complies with company, quality, client, and regulatory standards.

PWHT technicians use various pieces of equipment, such as electric preheaters and cyclones, for heat treating processes, including reading plans and drawings to plan work flow, choose appropriate tools, and make decisions based on measurable criteria. Depending on their industry of choice, PWHT technicians may need to familiarize themselves with welding codes as well as requirements governing metals such as carbon steel or work-hardened stainless steel that require heat treatment processes.

Experience

PWHT is a process designed to reduce residual stress in welded structures such as pipes, pressure vessels and other metal fabrications, increasing toughness and ductility of welds and making them more resistant to cracking under dynamic loading conditions. PWHT works by increasing formation of acicular ferrite in weld metal which has been known to decrease fracture strains.

PWHT Technicians must possess the ability to control heating and cooling rates as well as interpret engineering drawings. Furthermore, they should understand and follow both written and verbal instructions effectively. Furthermore, this highly skilled career requires travel to remote locations worldwide for work purposes – an element which may make this position appealing.

One study conducted by Tomerlin et al, investigated the effects of PWHT at different temperatures on weld samples, finding that PWHT at 550degC for four hours provided optimal results.