Secher Griffith posted an update 9 months, 3 weeks ago
Stainless-steel pipe welding is gravy work. Has been. Always will probably be.
If you can undertake it and do it well, you’re the man and you will probably never go hungry. But it takes some attention to detail to acheive it right.
The biggest thing that separates the lads in the boys or must i say, the genuine welders in the rod burners may be the willingness to check out procedures for welding stainless. Procedures like looking forward to the pipe to chill involving passes, maintaining your hot tip in the rod shielded with argon, snipping the end with the tig welding rod in the event it gets crapped up, keeping the tungsten sharp.
One of the many procedures Come on, man is PURGE. Stainless steel absolutely has to be purged with argon gas to avoid sugaring. Sugaring is additionally called granulation yet it’s severe oxidation no matter what you call it.
You cant even get away with tack welding lacking any argon purge that shield the rear side or inside of the pipe. Exactly how do you take action? How do you protect the back side with argon?
Usually it is done with aluminum duct tape. The ends of the metal pipe are taped shut and also the whole inside is purged with argon gas. Even opening from the pipe joint itself is taped to ensure argon can fill the entire pipe and push out any oxygen. The tape is peeled back just enough to get a tack as soon as the pipe is purge enough.
What exactly is enough? The only way to tell for certain is with an oxygen analyzer. A bic lighter will not likely do just fine. Even 2% oxygen content will blow out a bic lighter. And 2% oxygen will result in a black root pass.
There are many other hard core ways to check 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 pipe you weld.
Ensure there’s no water within the pipe…not a drop. One 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 will get. Think about argon just as if it turned out water. Because it’s heavier than air, it will fill up any space like water, displacing mid-air 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 a lower flow rate. Along with a diffuser about the end in the end of your argon hose usually enables you to work with a higher flow rate. A homemade diffuser can be made by incorporating stainless-steel wool , some perforated stainless sheet, and a little sheet metal.
When you verify an excellent purge, you are ready to tack. Peel the tape back adequate 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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