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PWHT jobs involve preheating and postweld heat treatment (PWHT) of pipe welds and equipment according to company, quality and client standards. This typically requires reading documentation, monitoring preheat charts and operating equipment. PWHT is necessary to reduce residual stresses in welded components and can be time and cost intensive; some codes even mandate it for …

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PWHT (post-weld heat treatment) is an integral component of welding that reduces residual stresses and tempers the heat affected zone, as well as improving weld ductility to avoid cold cracking. PWHT involves heating a material to an exact temperature for an extended period, then gradually cooling it over time. It is an intricate process requiring …

Lue lisää “PWHT – A Necessary Step in the Welding Process”

Prior to 2014, ASME B31.3 required carbon steel welds be post weld heat treated (PWHT). However, with recent amendments of this Code allowing exemptions when weld thickness exceeds certain limits, post weld heat treatment becomes optional in certain instances. This paper will analyze the arguments used to justify exemptions, showing many to be invalid or …

Lue lisää “Comparison of ASME B31 3 PWHT Requirements”

The B31.3 Code defines rules for piping systems used in oil refineries, chemical, paper & pulp, semiconductor manufacturing facilities, power generation stations and similar processing plants. This document specifies requirements for designing, fabricating, assembly erection examination inspection & testing of process piping. An EPRI report (Ref 1) has recommended that the PWHT temperature for 1-1/4 …

Lue lisää “B31.3 PWHT Table”

Post-weld heat treatment (PWHT), commonly referred to as stress relief, involves heating and cooling welds to alleviate residual stresses that could otherwise lead to cracking and fractured welds. PWHT involves specific rates, tolerances and times at temperature that Wisconsin Oven furnaces offer for maximum stress-relief. Annealing, normalizing and stress relieving are just some of its …

Lue lisää “A Qualified PWHT Company Is Essential For Your Project”

ASME B31.3 -standardin vuoden 2014 painoksesta lähtien paksut hiiliteräsputket on vapautettu hitsauksen jälkeistä lämpökäsittelyä (PWHT) koskevista vaatimuksista, jolloin vaaditaan vain monikerroshitsaus eikä esilämmitystä tarvita. On esitetty huoli siitä, että tällaiset vapautukset saattavat olla vaarallisia. Tämän EPRI:n sponsoroiman ja RRAC-ryhmän jäsenten kirjoittaman asiakirjan tarkoituksena on ...

Lue lisää “ASME B31.3 Post Weld Heat Treatment Requirements For Carbon Steel Pipe”

Tällä viikolla debytoi naisten ammattilaisjääkiekkoliigan kausi, ja sen säännöt eroavat merkittävästi NHL:n säännöistä. NHL:ssä joukkueet saavat kaksi pistettä voitettuaan jatkoaika- tai rangaistuspotkukilpailun, kun taas PWHL:ssä ne saavat pisteitä vain, jos voitto tuli varsinaisella peliajalla. ...

Lue lisää “The Shootout and Jailbreak Goal in PWHL Hockey”