Tag Archives: interpass

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How to Weld Quenched and Tempered Steels

It is often incorrectly assumed that quenched and tempered (Q&T) steels are hard to weld or even completely unweldable.  This assumption is inaccurate as most Q&T steels have great weldability.  However, extreme care must be taken to prevent cracking or loss of certain mechanical properties.  A very common quenched and tempered steel is ASTM A514.  […]

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Preheat and Interpass Temperature for Structural Steels

Preheating of structural steels is carried out primarily to slow the cooling rate after welding and prevent the formation of martensite.  Martensite makes the weld and the heat affected zone (HAZ) very hard and brittle.  This newly formed microstructure is susceptible to cracking.  By slowing the cooling rate we reduce or eliminate the formation of […]