Erickson Calderon posted an update 1 year, 3 months ago
Stainless pipe welding is gravy work. Has been. Always will be.
If you possibly could do it and do it well, you are man and you will never starve yourself. Nevertheless it takes some awareness of detail to do it right.
The most important thing that separates the lads from the boys or can i say, the genuine welders through the rod burners could be the willingness to adhere to procedures for welding stainless-steel. Procedures like expecting the pipe to chill among passes, maintaining your hot tip in the rod shielded with argon, snipping the tip from the tig welding rod if this gets crapped up, keeping your tungsten sharp.
One of the primary procedures What i’m saying is is PURGE. Stainless absolutely needs to be purged with argon gas in order to avoid sugaring. Sugaring is additionally called granulation yet it’s severe oxidation no matter what you refer to it.
You cannot even pull off tack welding lacking an argon purge that shield the rear side or interior of your pipe. Exactly how do you undertake it? How would you protect the rear affiliate with argon?
Usually it’s done with aluminum duct tape. The ends of an metal pipe are taped shut along with the whole inside is purged with argon gas. Even opening inside the pipe joint is taped in order that argon can fill the complete pipe and push out any oxygen. The tape is peeled back ample to get a tack as soon as the pipe is purge enough.
Precisely what is enough? The only method to tell without a doubt has been an oxygen analyzer. A bic lighter will not have the desired effect. Even 2% oxygen content will fly out a bic lighter. And 2% oxygen will lead to a black root pass.
There are some other smart methods to look into the purge but an oxygen analyzer is the sure way.
Here are some tips that will help you get a good purge for the stainless steel pipe you weld.
Ensure there is absolutely no water in the pipe…not even a drop. One drop of water will throw a monkey wrench within your purging until it evaporates. Remember what exactly is in water? Hydrogen and oxygen.
Poke a vent hole inside the uppermost place you will find. Imagine argon just as if it turned out water. Since it is heavier than air, it will fill any space like water, displacing air mainly because it fills every nook and cranny.
More purge gas flow is not always better. A high and turbulent flow of argon won’t necessarily purge a pipe quicker compared to a lower flow rate. Plus a diffuser for the end from the end of one’s argon hose usually permits you to make use of a higher flow rate. A homemade diffuser can be made by incorporating stainless steel wool , some perforated stainless sheet, as well as a bit of sheet metal.
After you verify a great purge, you are prepared to tack. Peel the tape back just enough to tack and let cool a bit and re tape. Then tack again 180 degrees apart. Continue until all tacks have established yourself.
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