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TIG Weld Technique (stainless tubing not pipe) Posted by Blackcar [Email] (#3126) [Profile/Gallery] (more from Blackcar) on Fri, 3 Sep 2010 07:11:15 In Reply to: C900 Header, Blackcar [Profile/Gallery] , Tue, 24 Aug 2010 07:27:05 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Clean and keep clean all weld surfaces. Use reverse polarity (torch is +). Bull-heading (design that puts the exhaust flow in conflict(external wastegate line for example) is to be avoided Refrain from open-root butt-joints. 100% penetration can be achieved with high amps (130 to 160) which produces a near flush internal weld surface (preferalbe). Move the torch quickly adding continuous fill. Don't "walk-the-cup" or dip the filler rod. Quarter the weld when possible to counteract warping. Keep shield gas pressure in the 15psi range. Over-pressure of shield gas (100% Argon) can produce excessive heat-soak. In the case of header fabrication fit and tack the weldment completely, then remove and weld-out. Move around the piece to spread heat-soak. Clamp or tack a "strongback" (made from angle stock) between the head flange and collector flange before weld-out begins. Welds pull when cooling, so keep the "stongback" in place during this phase. Finally, TIG welding produces very intense radiation. A filter lens factor of 12 is minimal for eye protection.
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