8mm plate to 2mm pipe ?

[hunter27]

Hi Again
I have just come in from playing with my new TIG and hopefully am getting used to it. I have made plenty of mistakes but now I need to weld a stainless steel exhaust flange 8mm thick onto the end of my stainless steel pipe which is 2mm thick. I have cut a very tight hole for the pipe to pass through the flange but can only weld on the inner face (engine side) of the flange to the end of the pipe. I have been using the settings from the tutorial on this site but they only go up to 3mm ?
I plan to weld around the lip without filler to start with and then add filler on the second pass then grind the flange flat.
What settings /tungsten/rod/amps should I use ?
Should I V out the flange slightly to leave space for more filler ?
Is my R-Tech 165 powerful enough to do this ?

Thanks
Pete

 

[Lawnmowerboy]

I would use 1.6mm tungsten about 90 first pass and more like 100 for the 2nd pass rods either 1mm or 1.6 will be Fine. A bit of a chamfer prep would help and give you room for more filler. Keep the heat onto the flange and it should Al go fine.

 

[biffa]

I would set the pipe 2mm into the flange, tbh you wont Gain any benefit by fusing it first, only put more heat in more heat = more distortion, I would probably use 1.6 filler rod, and roll the edge of the 8mm down so you won't need to grind afterwards

 

[hunter27]

Thanks for the advice
I will give it a go tomorrow.
Pete