Re: [MW:29966] Impact test fails FCAW process

Dear Mr Vishal ,

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

welding position is a factor .. as in uphill 3g welding heat is more due to the uphill movement is slow (welding speed ) which lead to increasing the size of grains for the lower pass (like a normalizing effect .. "heating" then "cooling in air" ) which lead to decrease the CVN values ( very clear comparing with the cap passes CVN impact values )

the electrode used is "J" will give 27J@-40c which is already get at the cap.

dilution for FCAW is low comparing to SAW which restrict you for using the benefits of the base metal 

so , 

you can try to change your joint design to minimize the number of passes above the root ( if it possible try double V ) 

also u need to check the consumables MTC for Mn% which affect also the CVN values

Best Regards ,

Ahmed Osman

On Monday, August 19, 2019, 07:47:44 a.m. GMT+3, chakotevishal47@gmail.com <chakotevishal47@gmail.com> wrote:

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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