D 1.1 CODE PQR NEED TO ACHIEVE IMPACT VALUE 54 JOULE AT -40 DEGREE 2

[maheshp9]

Dear All,

I have come across a condition where i need to weld the ASTM A 572-81 GRADE 50 to be welded with ASTM A 572-81 GRADE 50 and A36. i guess that it has to be welded with 70s-6 filler wire if we weld it with GMAW process and 7018 if we weld it with SMAW process. is that right? but my problem is client has asked for impact value 54 Joule at -40 degree. My question is , is it possible to achieve this value using carbon steel consumable(7018 or 70s-6)? could i use any other weld consumable to achieve this value? please suggest..

 

[DVWE]

Unless your client has an objection to nickel based electrodes;
I would suggest a nickel alloy such as ER80S-Ni1 or Ni2 for GMAW.
SMAW E7018-1 should suffice or similar to above, E8018-C1 or C3.

 

[Don56]

Does the base metal require impact testing?

 

[maheshp9]

Yes Don56.

The drawing is stating that below 2 notes,

1)P1- structural standard weather condition minimum charpy value of 40 ft-lbs(54J) at -20 C

2)P2- structural cold weather extreme minimum charpy value of 40 ft-lbs(54J) at -40 C

please let me know if any additional information required.

Regards,

 

[Don56]

You should be successful running ER70S-6 or E7018-1. I'd prefer ER70S-6 with an Argon blend gas. Don't use E7018.

 

[DVWE]

You may want to contact the manufacturer of the electrode and see if they have any impact data of the ER70S-6 at -40 F

 

[maheshp9]

Dear don56,

Could you please suggest the blending ration for argon and carbon. we are using 80%Ar + 20% Co2 at the moment. what ratio we should use to achieve this impact value?

are you sure that, this values can be achieved with 70S-6 and E7018-1 electrodes? have u come across any PQR in which this value has been achieved?

Please reply.

 

[Don56]

maheshp9,
Your 80/20 blend of Ar/CO2 should be fine.
Go to the Lincoln Electric website and search their consumables tab for the electrodes you plan to use. You will see that both these should provide acceptable results.