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Forum: Welding Sheet Metal

06-30-2018, 01:07 PM

Replies: 34

dc tig mild steel

Views: 20,660

Posted By hot rivet

Is your gas Ar+CO2 or is it Ar+CO2+O2 Neither are...

Is your gas Ar+CO2 or is it Ar+CO2+O2 Neither are right for tig but if the gas has upto 5% o2 (as is common on mig welding) you're never going to have any luck with tungstens

Forum: Welding Sheet Metal

06-29-2018, 04:31 PM

Replies: 34

dc tig mild steel

Views: 20,660

Posted By hot rivet

The problem is almost certainly the co2 it breaks...

The problem is almost certainly the co2 it breaks down in the arc to form carbon monoxide and oxygen- the oxygen reacts with the tungsten and the steel = porosity and dirty tungsten.

Forum: Welding Sheet Metal

06-29-2018, 06:03 AM

Replies: 34

dc tig mild steel

Views: 20,660

Posted By hot rivet

If you are tig welding steel with anything other...

If you are tig welding steel with anything other than argon you are going to have problems, CO2 is not an inert gas and that will be part of your problem. From experience tig ceramics will absorb...

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