25 wall thickness tank wall.hopefully that will be a single stage, and one of those cheap robotic mig welds where they're worried about production and not longevity If you have to ask, you don't KNOW what you are doing. If that same air tank fails because you welded on it and made the metal brittle or hard or set up any other material condition (such as due to the HAZ or the filler metallurgy or such) that leads to a brittle failure (as opposed to a ductile failure) then things can get RealBad-RealQuick. If a steel air compressor tank fails by rusting through, that -usually- just means the air will leak out. And even a 'little' air tank at a 'low' pressure of 100-150 pounds or so can destroy things (and people) if it fails catastrophically. Even just a little bit.Ĭrappy or broken OEM weld or not, you do NOT weld on a pressure vessel unless you KNOW what you are donig.Īnd yes, air tanks and pressure vessel can and do fail. Yes, it -IS- a big deal to weld on a pressure vessel.īack to the air compressor cylinder/tank.ĭo -NOT- weld on it. Strike an arc on such a cylinder and it is pretty much condemned. If not abused, and given even a little bit of care, a 'typical' high-pressure gas cylinder can have a service life around 100 YEARS! In my locale, ASME Pressure Vessel Codes apply.Īnd although it is not -as- dangerous as welding on a high-pressure cylinder. At least at some point in the design cycle.Īnd different locales may have slightly different certification on the design and construction and repair of air compressor tanks. It is NOT rated for impact or fatigue conditions, both of which are DarnImportant for a pressure vessel.Īctually, the compressed air tanks (and their design and construction) ARE rated and tested. And that is about the only kind/class of small spool and small diameter FCAW wire that will run on the small 'home' FCAW/GMAW machines. No matter how bad the OEM weld was, you do NOT weld on a pressure vesssel unless you KNOW exactly what you are doing.Īnd have the certifications and paperwork and liability insurance 'proving' you know what you are doing.Īnd the bracket welded to the outside of the pressure vessel is still considered welding on a pressure vessel.Īnd btw, I don't think you would EVER find Lincoln listing their 'typical' small welder NR211-MP FCAW wire as approved for pressure vessel welding. You do NOT weld on a pressure vessel unless you are certified/approved to do so with certified/approved materials and procedures, including the specified inspections afterward. Weld on the actual exterior of the tank surface?
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