[pankaj pachahara]

Dear Welding Experts,

We have recently completed PQR qualification on a 220 mm thick joint using a combination of SMAW + SAW processes. 

Material-SA 5160 GR.70 

• SMAW deposited thickness: 111 mm(E7018-1)

• SAW deposited thickness: 109 mm(EH10K)

I now need to prepare a WPS for the SMAW process only. Could you please clarify up to what thickness this WPS will be qualified for based on the deposited SMAW thickness?

Best Regards

Pankaj

[Saurabh Jain]

As per sec IX

Without impact 5mm to 1.33T, 

With impact 16mm to 1.33T

Max deposit thickness also 1.33T

Regards 

Saurabh Jain

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[pankaj pachahara]

So our max deposit thickness in WPS will be -220X1.33 =292.6

We will not consider the thickness we have deposited by smaw process.

We will consider Our PQR test coupon 220 thick. 

 

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[sridhar cn]

One out of way query:

Why use SMAW process for a 111 mm thick weld deposit? SAW is OK for balance 109 mm thickness.

SMAW is inefficient compared to GMAW/FCAW  processes. They have an efficiency of 85 to 90%  

compared to 30-40% in SMAW (due to use of E 7018) and will reduce your welding time and cost factor.

Think for a better change!

C Sridhar.

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[pankaj pachahara]

We have made SMAW+SAW WPS but now using that previous PQR we will qualify SMAW process for nozzle in Boilers we don’t have approved WPS for GMAW/FCAW so that’s why we need to make for SMAW. 

Best Regards

Pankaj 

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[sridhar cn]

Understood, and thanks for the clarification. For a nozzle joint welding in a boiler, third party

agencies allow SMAW process in general.

CS

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