PWHT-HEAT INPUT
PWHT-HEAT INPUT
(OP)
hello
When i have a WPS than indicate than welding should be PWHT , the control of the HEAT INPUT IN THE WELDING is unnecessary, that is true?
Thanks for your help
Juan
When i have a WPS than indicate than welding should be PWHT , the control of the HEAT INPUT IN THE WELDING is unnecessary, that is true?
Thanks for your help
Juan





RE: PWHT-HEAT INPUT
RE: PWHT-HEAT INPUT
RE: PWHT-HEAT INPUT
What does interpass temperature have to do with heat input ?
Heat input is the relationship between amps, volts and travel speed.
Regards,
Shane
RE: PWHT-HEAT INPUT
Two different concepts. Neither of which relates to the need for PWHT.
RE: PWHT-HEAT INPUT
The "control of heat input criteria" depends on what grade of steel being welded and what's the notch toughness requirement is asked for. Conventional PWHT such as Stress Relieving below Lower Critical Temperature relieves residual stresses, does not cause significant refinement of grain structures(Weld & HAZ). Hence some judicious control of heat input irrespective of PWHT is always desired.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
RE: PWHT-HEAT INPUT
RE: PWHT-HEAT INPUT
Thank you all for your time, metengr ,CWEng,DekDee, weldstan and pradipgoswami.
Juan