ASME Definitions, Consumables, Welding Positions

ASME has adopted their own designation for welding processes, which are very different from the ISO definitions adopted by EN24063.   Designation Description OFW Oxyfuel Gas Welding SMAW  Shielded Metal Arc Welding (MMA) SAW Submerged Arc Welding GMAW Gas Metal Arc Welding (MIG/MAG) FCAW  Flux Cored Wire  GTAW Gas Tungsten Arc Welding (TIG) PAW Plasma Arc Welding Straight ...

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Postweld Heat Treatment

What is PWHT? Postweld heat treatment (PWHT), defined as any heat treatment after welding, is often used to improve the properties of a weldment. In concept, PWHT can encompass many different potential treatments; however, in steel fabrication, the two most common procedures used are post heating and stress relieving. When is it Required? The need for PWHT is driven by code and application requirements, as well as the service environment. In general, when PWHT is required, the goal is to increase the resistance to brittle fracture and relaxing residual stresses. Other desired results from PWHT may include hardness reduction, and material...

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