Re: [MW:32389] PREHEAT TEMPERATURE

Min and Max preheat temperatures are mentioned in ASME Sec II C also for certain consumables.

Regards

Prem Nautiyal 

On Sun, 23 May 2021, 09:14 Manoj Mumbai, <manojacgnr@gmail.com> wrote:

ASME B31.3 and RP582

On Sat, May 22, 2021 at 3:26 PM Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:

Could you give code ref for control of preheat on maximum side

On Sat, May 22, 2021, 3:10 PM Gerry Lourens <Gerry.Lourens@newage-eng.com> wrote:

There are no limits to the Preheat temperature provided that there are no toughness requirements.

If toughness (impacts) are required :

the maximum inter-pass temperature qualified equals the maximum preheat temperature.

Best Regards,
	Gerry Lourens Welding Engineer New Age Engineering Solutions
	M: +27 62 192 1207 T:  +27 17 631 5282 F:  +27 (0)86 616 9701 E:  gerry.lourens@newage-eng.com A:  3 York Street, Evander, 2280

On Sat, May 22, 2021 at 5:49 AM Manoj Mumbai <manojacgnr@gmail.com> wrote:

Dear Experts,

The preheat temperature shall not be less than 55 deg. C as per QW-406.1 but  not specified a maximum how much it can be from the temperature noted in PQR as preheat temperature is minimum temperature and interpass temperature is the maximum temperature.

My question , Is there any limitation to increase preheat temperature than mentioned in PQR. suppose PQR temperature is Ambient, say 38 deg. C, can we increase preheat temperature to 204 deg. C.  I have a qualified procedure of P6 material at ambient temperature 38 deg.C now I have to include preheat temperature.

Thanks in advance for your expert opinion.

Manoj.

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