Discover the Stainless Steel Pipe Welding
Stainless pipe welding is gravy work. Has been. Always is going to be.
If you can undertake it and undertake it well, you're man and you will probably never starve yourself. Nevertheless it takes some focus on detail to acheive it right.
The most important thing that separates the boys from the boys or should I say, the true welders from your rod burners will be the willingness to check out procedures for welding metal. Procedures like waiting for the pipe for cooling involving passes, maintaining your hot tip of the rod shielded with argon, snipping the end from the tig welding rod when it gets crapped up, keeping your tungsten sharp.
One of the main procedures What i'm saying is is PURGE. Stainless steel absolutely must be purged with argon gas to prevent sugaring. Sugaring can also be called granulation but it's severe oxidation whatever you refer to it as.
You cannot even get away with tack welding without an argon purge that shield the rear side or inside of the pipe. So how do you do it? How do you protect the rear side with argon? 
Usually it's done with aluminum duct tape. The ends of an stainless steel pipe are taped shut and the whole inside is purged with argon gas. The opening within the pipe joint itself is taped in order that argon can fill the complete pipe and push out any oxygen. The tape is peeled back adequate to obtain a tack when the pipe is purge enough.
Precisely what is enough? Inside your tell without a doubt has been an oxygen analyzer. A bic lighter will not likely work. Even 2% oxygen content will fly out a bic lighter. And 2% oxygen will lead to a black root pass.
There are a few other hard core methods to look at the purge but an oxygen analyzer will be the sure way.
Below are a few tips that will assist you get a good purge about the stainless pipe you weld.
Be sure there is no water inside pipe...not even a drop. A unitary drop of water will throw a monkey wrench within your purging until it evaporates. Remember precisely what is in water? Hydrogen and oxygen.
Poke a vent hole within the uppermost place you can find. Imagine argon as if it absolutely was water. Since it is heavier than air, it is going to fill any space like water, displacing air mainly because it fills every nook and cranny.
More purge gas flow isn't necessarily better. A high and turbulent flow of argon won't necessarily purge a pipe quicker when compared to a lower flow rate. As well as a diffuser on the end in the end of the argon hose usually enables you to make use of a higher flow rate. A homemade diffuser can be achieved with many stainless steel wool , some perforated stainless sheet, as well as a little bit of sheet metal.
After you verify a great purge, you are prepared to tack. Peel the tape back adequate to tack and let cool a little and re tape. Then tack again 180 degrees apart. Continue until all tacks are in place.
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