Christiansen Calderon posted an update 1 year, 4 months ago
Stainless steel pipe welding is gravy work. Always has been. Always will probably be.
If you can get it done and do it well, you are man and you will probably never go hungry. Nevertheless it takes some focus on detail to get it done right.
The main thing that separates the lads through the boys or can i say, the true welders through the rod burners will be the willingness to check out procedures for welding stainless. Procedures like waiting for the pipe for cooling involving passes, maintaining your hot tip from the rod shielded with argon, snipping the tip from the tig welding rod when it gets crapped up, maintaining your tungsten sharp.
One of the many procedures After all is PURGE. Stainless-steel absolutely must be purged with argon gas to prevent sugaring. Sugaring is also called granulation however it is severe oxidation no matter what you refer to it as.
You cannot even get away with tack welding lacking any argon purge that shield the back side or inside of the pipe. So how do you do it? How can you protect a corner affiliate with argon?
Usually it is finished with aluminum duct tape. The ends of the stainless pipe are taped shut along with the whole inside is purged with argon gas. Perhaps the opening inside the pipe joint is taped so that argon can fill the entire pipe and push out any oxygen. The tape is peeled back sufficient to acquire a tack once the pipe is purge enough.
What is enough? The best way to tell for sure is with an oxygen analyzer. A bic lighter won’t do just fine. Even 2% oxygen content will blow out a bic lighter. And 2% oxygen can result in a black root pass.
There are several other down and dirty ways to look at the purge but an oxygen analyzer could be the sure way.
Here are a couple tips that may help you get a better purge on the stainless pipe you weld.
Ensure there is 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 in the uppermost place you will find. Imagine argon just as if it absolutely was water. Because it’s heavier than air, it will complete any space like water, displacing air mainly because it fills every nook and cranny.
More purge gas flow may not be better. A top and turbulent flow of argon will not likely necessarily purge a pipe quicker than the usual lower flow rate. And a diffuser on the end with the end of your argon hose usually permits you to work with a higher flow rate. A homemade diffuser can be made by incorporating 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 bit and re tape. Then tack again 180 degrees apart. Continue until all tacks have established yourself.
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