Stainless pipe welding is gravy work. Has always been. Always is going to be.
If you're able to undertake it and take action well, you're man and you may never go hungry. Nevertheless it takes some focus on detail to acheive it right.
The main thing that separates the boys in the boys or should I say, the real welders through the rod burners will be the willingness to follow procedures for welding stainless. Procedures like waiting for the pipe to cool involving passes, maintaining your hot tip of the rod shielded with argon, snipping the tip from the tig welding rod in the event it gets crapped up, maintaining your tungsten sharp.
One of many procedures What i'm saying is is PURGE. Stainless steel absolutely has to be purged with argon gas to avoid sugaring. Sugaring can also be called granulation but it is severe oxidation no matter what you refer to it.
You cannot even pull off tack welding without an argon purge that shield the trunk side or inside the pipe. How do you undertake it? How do you protect the rear affiliate with argon?
Usually to control your emotions with aluminum duct tape. The ends of the stainless steel pipe are taped shut and also the whole inside is purged with argon gas. The opening within 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 acquire a tack when the pipe is purge enough.
Precisely what is enough? The only way to tell without a doubt has been an oxygen analyzer. A bic lighter is not going to do the trick. Even 2% oxygen content will fly out a bic lighter. And 2% oxygen can result in a black root pass.
There are some other smart ways to confirm the purge but an oxygen analyzer will be the sure way.
Here are some tips that may help you obtain a good purge on the metal pipe you weld.
Be sure there's no water within the pipe...not really a drop. A unitary drop 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 inside the uppermost place you can discover. Think about argon as though it was water. Because it is heavier than air, it will fill up any space like water, displacing the environment as it fills every nook and cranny.
More purge gas flow may not be better. A high and turbulent flow of argon will not necessarily purge a pipe quicker than the usual lower flow rate. And a diffuser around the end with the end of the argon hose usually enables you to utilize a higher flow rate. A homemade diffuser can be achieved with many stainless wool , some perforated stainless sheet, along with a amount of sheet metal.
After you verify a fantastic purge, you're to tack. Peel the tape back sufficient to tack and let cool somewhat and re tape. Then tack again 180 degrees apart. Continue until all tacks have established yourself.
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