Stick vs Wire Welding

[marinaman]

I have a project with several CJP welds.

Within the construction documents, I have called for E70 electrodes to be used in a stick welding application.

The erector has come back to this office and asked if he can use a wire fed welding procedure using NR-232 Lincoln Electric wire.

Have you guys run into this before? I am not familiar with the NR-232 wire, but in comparing the E70 to the NR-232 data, it looks like the Charpy V Notch data is much higher for the stick weld.

Is this a substation you guys allow.....going from stick welding to wire fed welding? I don't have a feel for the capacity difference nor the cracking potential difference. I have called Lincoln to get their input on this issue, but have not heard back yet.

 

[fegenbush]

If the erector is insisting on a self-shielded flux-cored wire, you could insist on something like NR-203MP which has a higher toughness and is tested to a colder temperature than the NR-232. NR-203MP has better toughness than E-7018 (based on Lincoln Electric's data)

 

[JStephen]

On the V-notch data, the question would be, is it high enough? You wouldn't normally randomly specify a weld procedure just to get a higher notch toughness if the application didn't require it.

 

[Ron]

What is the application? Do you really need a specific toughness requirement? Is this a field weld or a shop weld? Will there be supplementary gas shielding or flux core only? Will there be NDT done on the welds and if so, what method?