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What is difference in post weld heat treatment and stress relieving?
PWHT is a form of stress relief, other forms can be as simple as smacking your structural weld with a hammer. PWHT re-aligns metallic molicules (face centered) to similar configurations as before rapid heating and cooling occured.
Is PWHT required after welding with ASTM A216 WCB material?
Post-weld heat treatment (PWHT) is typically required for ASTM A216 WCB (cast carbon steel) materials when they are welded, particularly for thicker sections or when they are used in high-stress applications. PWHT helps relieve residual stresses and improve the toughness of the weld and heat-affected zone. However, the necessity for PWHT can also depend on specific design codes, service conditions, and the thickness of the components being welded. It's important to consult relevant industry standards and specifications for guidance on specific applications.
Why need to do PWHT for carbon steel use to caustic service pipe?
There is caustic stress corrosion cracking when carbon steel is exposed to concentrated caustic solution. Caustic SCC is driven by tensile stress, susceptible material and concentration of caustic. So, lack of PWHT will increase susceptibility also hardness and residual stress that is the more significant factor in caustic corrosion. Thanks and Regards Abdul Khaleem Abdul Razak
What is difference in post weld heat treatment and stress relieving?
PWHT is a form of stress relief, other forms can be as simple as smacking your structural weld with a hammer. PWHT re-aligns metallic molicules (face centered) to similar configurations as before rapid heating and cooling occured.
What is full form PWHT in construction welding?
Post weld heat treatment
Is PWHT required after welding with ASTM A216 WCB material?
Post-weld heat treatment (PWHT) is typically required for ASTM A216 WCB (cast carbon steel) materials when they are welded, particularly for thicker sections or when they are used in high-stress applications. PWHT helps relieve residual stresses and improve the toughness of the weld and heat-affected zone. However, the necessity for PWHT can also depend on specific design codes, service conditions, and the thickness of the components being welded. It's important to consult relevant industry standards and specifications for guidance on specific applications.
What is p11 and p22 material?
P-11 is a piping material usually used in refinery and petrochemicals industries for services at or around 550 to 600 degree C temp. It is low alloy steel. It contains 1.25 cr and 0.5moly.It resitant to hydrogen attack. It need PWHT(post weld heat treatment). PWHT to be in the range of 680 to 780 degree C. P-22 is a piping material usually used in refinery and petrochemicals industries for services at or around 550 to 625 degree C temp. It is low alloy steel. It contains 2.25 cr and 1.moly.It resitant to hydrogen attack. It need PWHT(post weld heat treatment). PWHT to be in the range of 680 to 780 degree C.
What is full form PWHT in construction?
pipe weld heat treat
Does the PWHT required for the cs to ss joint?
Also I need the answer for this question. Nobody? anybody?
Can you Welding after pwht for P91 material?
No.You should not do that because the welding heat leads to over tempering of P91 which reduces the toughness and ductility...
Why need to do PWHT for carbon steel use to caustic service pipe?
There is caustic stress corrosion cracking when carbon steel is exposed to concentrated caustic solution. Caustic SCC is driven by tensile stress, susceptible material and concentration of caustic. So, lack of PWHT will increase susceptibility also hardness and residual stress that is the more significant factor in caustic corrosion. Thanks and Regards Abdul Khaleem Abdul Razak
What is buttering process in metal fabrication?
Buttering: the addition of material, by welding, on one or both faces of a joint, prior to the preparation of the joint for final welding, for the purpose of providing a suitable transition weld deposit for the subsequent completion of the joint. Simply it is weld build up of (one or both) base metal(s) before beginning to weld the joint itself. This can be done in order to make up for poor joint preparation as indicated previously, but also is done to minimize the effect of PWHT on a sensitive material or eliminate subsequent PWHT.
