Preheat decrease >50deg.C

[Vadivel Mahadevan]

Dear Experts,
I have a doubt.
In ASME sec. IX,in many Welding process it is mentioned as "Preheat decrease >55 deg. C"
can you let know what it means exactly.. How to intrepret this variable..
Thanks in advance
Vadivel M

[Kannayeram Gnanapandithan]

In PQR, if ur preheat temp is 100,℃, in wps u can mention minimum 45℃, ( 100-55=45,) if it is mentioned less 45, requalification required

On 21-Apr-2017 5:44 PM, "Vadivel Mahadevan" <vadivel...@gmail.com> wrote:

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[Prakash Hegde]

Just to add to Mr Mahadevans reply 

You req to preheat Even the thk of the job is very less(provided you use the same wps n spporting pqr) thete is no restriction on higher side preheat temp.

Regards

Hegde

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[Vadivel Mahadevan]

Thank you gentlemen..
With regards
Vadivel M