lookin for the oldest pipe welder in the shop

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i was told long ago if you want to learn something you find the oldest guy in the shop and ask him. Need some ideas on controlling heat distortion from welding on thin wall stainless tube. I'am quartering them now and or planing starts and stops. Walking the cup low and slow around 30 to 50 amps.
Reply:I'm not the oldest but I might be able to help. How thick is your thin wall? Usually you get less distortion by reducing heat input, that means hot and fast with a tight arc. The hotter it is the faster it will form a puddle, because of that you have less heat spreading past the toes of the weld into the HAZ. You don't want it too hot though, you won't be able to "outrun" the spreading heat and you will still add more heat into the part than needed.Just an example, I like around 50-60 amps (usually 55) for 1/16" 304 stainless while using 1/16" 308L filler.Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:Thanks for the reply brotha . Its mostly 1-1/2" x .065" 304 some 316  Little to NO filler. I hear ya on the travel speed. You ever use a heat sink?
Reply:I use low-n-slow all the time....works GREAT!  For smoking brisket with 3 different kinds of oak.  For welding thin wall stainless, not so much.So.....what kind of exhaust work ya doin'?   1st on WeldingWeb to have a scrolling sig! HTP Invertig 400HTP Invertig 221HTP ProPulse 300HTP ProPulse 200 x2HTP ProPulse 220MTSHTP Inverarc 200TLP HTP Microcut 875SC
Reply:Not exhaust work, Big RO filters for the beverage industry. Your not from Texas are you.
Reply:Originally Posted by Farmdogi was told long ago if you want to learn something you find the oldest guy in the shop and ask him.
Reply:old timers are also hard headed alot of times and wont change their ways or take advice.What is this tubing for. for most thin wall stainless I wont ever walk the cup. I'ts a straight one pass. most times dont even need to bevel the pipe and will still get full penetration.
Reply:The get in hot and fast works. If you have the right machine-pulse works great for controlling heat input. I set my Dynasty on pulse with a big gas lense and get in fast and out fast.