[MW:1816] Re: 1808] Re: Pre heat requirement for split welding procedures from combined PQR.

As on the PQR mentioned for FCAW process the preheating was 79 deg C, and according to QW-406.1, Decrease > 55 deg C is essential variable, hence for this case if in the WPS mentioned Preheating is ( 79 - 55 =32 deg C minimum), then requalification is not required. If the temperature is less than 32 deg C , then requalification is required.

hence it is 32 deg C.

 

Regards

 

On 3/27/09, Mohamed Mubarak Syed <smmubarakqc@gmail.com> wrote:

Dear Raj,

 

Could you please explain how become 32 C

 

On 3/26/09, Raj <nrajasek@eim.ae> wrote:

The min pre heat shall be 32 Deg C in this case. (87-55)

Rgds

raj

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ARI
Sent: Thursday, March 26, 2009 4:03 PM
To: materials-welding@googlegroups.com
Subject: [MW:1808] Re: Pre heat requirement for split welding procedures from combined PQR.

 

Dear Ibrahim,

 

You should specify the thickness of the Original PQR and the current thickness of the job, which you intended to utilize FCAW. Based on which only, the experts can respond!

 

regards,

 

On 3/26/09, Muhammed Ibrahim <ibratech@gmail.com> wrote:

Hi friends,

 

I would like to clarify one important thing about preheat. My PQR is qualified with SMAW+FCAW. When I start the welding I preheated to 24 degree C. After root and hot pass compleated with SMAW before starting FCAW the plate temperature is 87 degreeC. If I split this PQR to make a WPS only for FCAW, Is it required to preheat the plate to 87 degree C or can I give 24 degree celcius as preheated in the starting of PQR test coupon?. Your response will be highly appreciated.

 

The AI insisting to put preheat of 87 degree shall be considered when we split the PQR for FCAW because when FCAW process starts the temperature of the plate to be considered as the preheat temperature (87 degreeC).

Thanks & Regards
Muhammed Ibrahim PK
 

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