Welding Mild Steel Exhaust Tubing to 3/8" thick Mild Steel Header Flanges

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OA weld,OA braze or Tig weld with xxxxs2 wire or silicon bronze wire.I was told Tig welding them builds up too much stress because the metal cools off too fast.Which method to use.
Reply:Dont braze those bits.OA or TIG with metal fillerIve TIG'd quite a few with no problem.  If your worried about rapid cool, just do a bit of pre heat on the thick sections before welding, but myself woud not.
Reply:When I do them I bolt the flange tight to a jig then tig away letting them completely cool before unbolting them.Last edited by Old Skool; 10-20-2012 at 05:09 PM.
Reply:That is good for the OD of the tubing to the flange,What about welding the inside,tubing to the flange.
Reply:When your done, just resurface the entire thing on a belt sander.