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Please recommend Tig Welder?

I am very interesting in learning Tig WeldingIn addition I have a production project in mindI need to be able to tig weld at least 1/8 to 1/4quot; SS angle and square tubing and aluminum or similiar small projectsI will not be contracting to weld the Ohio River bridge or anything heavy dutyI want to spend no more than I have to but want good quality as wellI have researched some of the Miller models but are there off brand models that will work for me but are still of good qualityI can always upgrade later? Also what questions to ask and what to look for in purchasing a used tig welder? thank you.

Answer:

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I wouldn'tI would go stay in a hotel and look for myselfIt's a big expense and once the lease is signed you are locked in.
From a cost and productivity standpoint it makes little sense to TIG weld aluminum and stainless, unless x-ray quality and visual appearance are the biggest considerationsMIG welding is both easier, and 200%-500% faster than TIGStainless steel is fairly easy to MIG weld using 98%Ar+2%CO2 shield gas, and using an appropriate filler wire for the material(e.gER308LSi) The biggest consideration when MIG welding stainless is that all welds should be ground immediately prior to welding, otherwise lack-of fusion defects may result Alsogrinding wheels used for one project should never be used on anything else, otherwise corrosion problems due to cross-contamination may result You can also MIG weld aluminum, but it requires some special considerationsMIG welders must be outfitted with smooth double U groove feed rollers, teflon guides, and a teflon linerThe smallest amount of feed roller pressure should be used, to prevent the soft AL wire from birds-nesting100% pure Argon shielding gas is needed Grinding joints immediately prior to welding is absolutely critical with Al, it's recommended that parts also be cleaned with acetone first to remove all grease and dirtIt's recommended to use grinding wheels specifically designed for aluminum, and steps should be taken to avoid cross-contamination with grinding wheelsAluminum welding should generally be carried out in a separate area, away from areas where steels are being worked on.

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