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[MW:29965] Impact test fails FCAW process

By Materials & Welding
Dear experts,
We have carried out FCAW WPQR with PWHT. Welding consumable is E71 T12 CJ. Below are the conditions

Test coupon thk- 70 mm
Parent material- S355 G8+N
Process- FcAW
Welding consumable- E71T-12CJ
PWHT Temp- 580 deg C
Soaking time - 280 minutes
Impact test temp- minus 40 deg C
Heat input range (root)- 1.0-1.6 KJ/mm
Heat input range (cap)- 1.0-1.4 KJ/mm
Thermal efficiency- 0.8
Welding position-3G


The above welding consumable is recommended for PWHT.

The impact values are too low at root as well as cap.

Energy values- 16,15,25 J (root)
Energy values- 30,30,31 J (cap)

Can you please focus on impact values failure reasons?

Even if keeping low heat inputs the test has failed.

What could be the possible reasons of failure?

And with the same conditions WPQR passed with 2G position.

Please focus on possible reasons.

Regards,

Vishal

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