.There is a lot more to this than I want to type ...Tig welding.. is not something learned overnight.....Hurricane--your turn to take over as welding teacher on this forum ..I didnt do a very good job anyway..made every one mad when I told them No Gasless Mig Welders from HF
HaHa Tedd, Im in the same boat. Ive ****ed off more than one noob that thinks he knows how to weld on this forum and also on another forum, when it comes to welding. Im a professional welder with decades of experience,this is what I do for a living . But when i try to explain welding techniques to a weekend welder that only owns a harbor freight 110v gas less mig things get lost in the translation and the other person thinks Im being a know it all.
And when it comes to the typed word it is easy to take things the wrong way and out of context when someone tries to explain there point of view.So for anyone reading this , please dont take offense to the way I try to help you understand welding and techniques I am only trying to help out is all.
When I would weld small vessels or SS piping how we would purge is by tack welding all parts together and use masking tape to cover all weld gaps and any fitting gaps except for two inches where we would begin welding. then we would use the same tank of argon gas from the weld tank using an extra hose from the tank regulator. We would make a connection from the hose to the part being welded and let it fill with argon. You could put your face close to where the weld was going to be started and feel the pressure of the argon being pushed out of the weld ment thru the 2 inch spot not taped up.
I would normally let the part fill with argon for a few minutes depending on the its volume,using mostly my experience as a guide for the amount of time to to pass before welding.
I would start to weld where the tape was not covering the weld seam ,holding my tig torch in right hand and slowly pulling the tape with my left hand from the weld seam as i welded .
It always impressed me how nice the weld looked on the inside of pipe or a vessel and even a gas tank when this procedure was done correctly.
One thing I found out , purging is a fairly easy procedure to master if you know how to tig weld well. And the results are impressive.And would make a gas tank project look even better when completed.
Sorry for the long read, hope this helps someone someday with there project..