Experience the Stainless Steel Pipe Welding
Stainless pipe welding is gravy work. Has always been. Always will be.
If you're able to undertake it and take action well, you are man and you'll never starve yourself. But it takes some attention to detail to do it right.
The most important thing that separates the boys from your boys or should I say, the real welders in the rod burners is the willingness to follow procedures for welding stainless steel. Procedures like awaiting the pipe to chill involving passes, maintaining your hot tip with the rod shielded with argon, snipping the end of the tig welding rod when it gets crapped up, keeping your tungsten sharp.
One of the main procedures After all is PURGE. Stainless absolutely has to be purged with argon gas to avoid sugaring. Sugaring is also called granulation but it is severe oxidation whatever you refer to it.
You cannot even make do with tack welding lacking any argon purge that shield the trunk side or within the pipe. Exactly how do you do it? How do you protect a corner side with argon?
Usually it is finished with aluminum duct tape. The ends of a stainless steel pipe are taped shut as well as the whole inside is purged with argon gas. Perhaps the opening in the pipe joint itself is taped to ensure that argon can fill the complete pipe and push out any oxygen. The tape is peeled back sufficient to get a tack after the pipe is purge enough.
What's enough? The best way to tell definitely has been an oxygen analyzer. A bic lighter is not going to have the desired effect. Even 2% oxygen content will blow out a bic lighter. And 2% oxygen will lead to a black root pass.
There are many other serious methods to look into the purge but an oxygen analyzer may be the sure way.
Below are a few tips that will assist you obtain a good purge around the stainless-steel pipe you weld.
Ensure there's no water inside pipe...not a drop. A single drop of water will throw a monkey wrench inside your purging until it evaporates. Remember precisely what is in water? Hydrogen and oxygen.
Poke a vent hole within the uppermost place you can discover. Imagine argon as if it absolutely was water. Since it is heavier than air, it is going to fill up any space like water, displacing the air because it fills every nook and cranny.
More purge gas flow might not be better. A higher and turbulent flow of argon is not going to necessarily purge a pipe quicker when compared to a lower flow rate. Plus a diffuser around the end with the end of one's argon hose usually lets you use a higher flow rate. A homemade diffuser can be made with a few stainless steel wool , some perforated stainless sheet, and a bit of sheet metal.
After you verify an excellent purge, you are 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 have established yourself.
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