Re: [MW:32390] PREHEAT TEMPERATURE

Preheat temp maximum restricted only in AWS D1.1 only

On Sun, May 23, 2021, 9:51 AM Ganesh Muthurajan <qceng.mg@gmail.com> wrote:

Mr. Manoj, 

Preheat requirements for P6 materials ( martensite stainless Steel). 

As per ASME 31.3 Table  330.1.1

State  the minimum requirement are 200. Deg. C. For all thickness. There is no additional  requirement. We should follow min 200 deg C minimum temperature.  

Ans the inter pass temperature is min 315 deg  C, 

Even your PQR is in ambient temperature.  

On Sat, 22 May 2021, 9:19 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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