Re: [MW:28321] For Demand Critical weld as per AWS D1.8

Neilash, 

Which welding process you qualified and the heat input range????

On Sun, Sep 23, 2018 at 5:50 AM 'Neilash Kumar' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Consumable lot change need to do requalification  again . Even you can do test at Manufacturer end and get the 3.2 certification consumable MTC . 

Lincoln and ESAB is well aware of demand critical Weld qualification .other manufacturers also be contacted.

Sorry I can't share the copy of PQR and WPS which is approved by aramco.

P.NEILASHKUMAR 

Sent from my iPad

MOB :   +91 9952110791

On 22-Sep-2018, at 1:38 PM, Jibin Philip <jibinphilip123@gmail.com> wrote:

Neilash, 

Thank you so much  for you reply.So the conclusion is that we need to go for  ( two ) PQR - 3G & 1G position and make one WPS with both the values.Also the consumable batch used in PQR need to be followed in production weld. Am i correct??

Suppose our consumable lot change we need to go for new PQR or not ( as essential variable ).... Or any other option to tackle this??

If possible can u share ur PQR /WPS ( for reference only ) to my personnel mail : jibinphilip123@gmail.com

Regards, 

Jibin philip.

On Fri, Sep 21, 2018 at 10:01 AM 'Neilash Kumar' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Jibin ,

Normally demand critical welds , there is restriction in heat input , u need to consider and record high heat input welding using 3G vertical position and low heat input welding using 1G flat position ,both need to be addressed in PQR and WPS .

Also for demand critical Weld consumable lot is an essential variable , where the same lot to be used in production and WPS PQR . 

For this u need to take approval from Manufacturer and from your Management to proceed with TPI . 
Demand critical welds should be identified in drawing by engineering , so that u can proceed further .

Hope this clarifies , u can reach me below for further any clarification.

Recently I have done this qualification for aramco project .

P.NEILASHKUMAR 

Sent from my iPad

MOB :  +91 9952110791

On 21-Sep-2018, at 10:55 AM, CHITTARANJAN BHIWANDKAR <crbhiwandkar.smspl@gmail.com> wrote:

Mr. JIBIN PHILIP,

THIS S275JR IS A STRUCTURAL NON ALLOY STEEL EQUIVALENT OF IS2062.

HOW EVER IN ANY WELDING HEAT INPUT IS ALWAYS CONTROLED THROUGH WPS

BY WAY OF TRAVEL SPEED. THE FORMULA FOR HEAT INPUT IS (v*a) / travel speed.

ANOTHER FACTOR TO REDUCE THE HEAT IN PUT IS TO PREHEAT THE JOB.

Thanks/Regards,

C.R.Bhiwandkar

Supreme Megastructures Pvt. Ltd.

Supreme House, Plot No.-49/C,

Pratap Gad, Opp.-IIT Main Gate.

Powai, Mumbai - 400076

Cell No.:-+919867139337

On Thu, Sep 20, 2018 at 3:33 PM Jibin Philip <jibinphilip123@gmail.com> wrote:

Dear All, 

PQR : Code : AWS D1.1
Welding Process - FCAW ( E71T-1C )
Filler Size - 1.2mm
Material - S275JR to S275JR

For Demand Critical weld as per AWS D1.8, is there any heat Input restrictions are to be followed or not??. In our current WPS the Heat input mentioned are 0.6 to 1 kj/mm.Is this acceptable for Demand Critical weld application ??.  In AWS D1.8 - clause 6.8.1 mentioned as " The heat input range qualified by testing in accordance with Annex A. In annex A it showing a range of 1.2 to 3.1 kj/mm. Dear Experts please help .

Regards, 
Jibin philip

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