Re: [MW:17941] PQR for Welding Weldox 700

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On Sat, Jun 15, 2013 at 7:02 PM, rudolf <rudolf.jude@gmail.com> wrote:

Dear Community Members.

We have done a PQR coupon for welding Weldox 700E. The material Thickness was 35 mm. Double V Groove Butt Joint. 2G position. Code AWS D1.1

The following parameters were followed

Process = FCAW

Electrode wire = Esab Dual Shield II 110 

Gas = 80 % Argon 20% Co2

Gas Flow = 20 lpm

Preheat to 103 C

Interpass temp around 150 C

Current Settings 

DCEP CV

Amps 200 amps 24 Volts for root pass 

Amps 180 to 160  24 Volts for hot, fill and capping.

The heat input recorded was between .8 to 1.5 kj/mm

The wire feed rate was 10 m/min

We did a charpy test on weld metal however it failed.

The results were average of 8 kj absorption at -40 C

At 1mm and 5mm from fusion line the absorption was 80 to 130kj

Intend to do a re charpy test @ -18 C.

Though the client has not specified Charpy requirements and specifications. Wanted to do it for future requirements if any.

Request you to please share your opinion,

WHAT COULD BE THE REASON THE CHARPY @ WELD METAL IS SO LOW, and in the absence of specific requirements for CVN what should be the impact values.

AWS D1.1 does not state any values for Yield strength above 355 MPA, but leaves the onus on the client to specifiy.

Please advise.

Thanks

Rudolf

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