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Mig root on 2" small bore in 6g
Posted: Wed Feb 18, 2015 1:01 am
by Samson welding
I have a pressure test coming up that requires me to perform a mig or gmaw weld I'm not so familiar with. I have to run a root in the 6g position going vertical down on 2" heavy wall pipe. I'm trying to find out the best way to tackle this one because I really need to keep my job.. What type of gap and land is most effective? Also on what angle should I hold my whip or nozzle? I'm using a miller inverter and haven't determined the proper volt and amp setting either..I guess that would depend on gap and land used. Thank you for your help here guys I think I've got my fill and cap down packed.
Re: Mig root on 2" small bore in 6g
Posted: Thu Feb 19, 2015 11:08 pm
by Rick_H
There are other guys more suited to answer your question, but since this will be for a test, I would assume they will give you a WPS that will specify the settings, wire, etc. I'm assume sch 80 pipe?
@otto nobedder
Re: Mig root on 2" small bore in 6g
Posted: Fri Feb 20, 2015 12:53 am
by AKweldshop
Re: Mig root on 2" small bore in 6g
Posted: Fri Feb 20, 2015 8:35 am
by Superiorwelding
Samson,
In reality, your question is rather vague. We do not know what wire size you are running, short arc or pulse, gas, etc. I can only offer advise with what I have done and what I qualified to under ASME IV. Using the GMAW-S process here were my exact settings for the root.
Feather edge land
3/32" gap
Lincoln L-56 .35 wire
75/25 gas @25-30cfh
18.5 volts
241 IPM wire
125-130 amps
11-12 ipm travel speed
These settings were on 6" sch 80 pipe in the 6G position vertical down progression. They also are rather hot but after some testing we found we needed to be in the 125-130 amp range for adequate penetration and to wet in the toes of the weld.
Now, in exchange for helping you, please introduce yourself and tell us a little about you, your interests and your experience.
-Jonathan
