Unless you are looking for a relatively complex project that may get pricier than buying a welder ten just buy one. You can TIG weld off of any DC arc welder for steel and SS. You can even do so with aluminum but it is a bit trickier. A basic DC buzz box will run you between free and $100, figure another $100 for the torch. another $100 for the bottle of straight argon, $50 for a regulator and you are in business. With the microwave welder you still need to buy the torch, gas, and regulator, so in my opinion it is cheaper to buy than build. If you need high freq keep an eye on e-bay for a dayton, or miller unit as they pop up regularly.
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Andy
cheif floor sweeper & craftsman
Ironwood Artistic
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