Erickson Calderon posted an update 1 year, 6 months ago
Stainless-steel pipe welding is gravy work. Has always been. Always will be.
If you’re able to get it done and do it well, you are the man and you will probably never go hungry. But it takes some focus on detail to do it right.
The biggest thing that separates the men through the boys or should I say, the real welders from the rod burners may be the willingness to adhere to procedures for welding stainless-steel. Procedures like looking forward to the pipe to chill among passes, maintaining your hot tip from the rod shielded with argon, snipping the end in the tig welding rod if this gets crapped up, keeping the tungsten sharp.
One of the main procedures I am talking about is PURGE. Stainless absolutely should be purged with argon gas to avoid sugaring. Sugaring is additionally called granulation but it is severe oxidation it doesn’t matter what you think of it as.
You cant even pull off tack welding lacking any argon purge that shield the back side or inside the pipe. How do we do it? How will you protect the rear side with argon?
Usually it is done with aluminum duct tape. The ends of your stainless-steel pipe are taped shut as well as the whole inside is purged with argon gas. Perhaps the opening from the pipe joint itself is taped to ensure argon can fill your entire pipe and push out any oxygen. The tape is peeled back adequate to acquire a tack after the pipe is purge enough.
Precisely what is enough? Inside your tell without a doubt has been an oxygen analyzer. A bic lighter won’t have the desired effect. Even 2% oxygen content will blow out a bic lighter. And 2% oxygen will result in a black root pass.
There are many other down and dirty approaches to look into the purge but an oxygen analyzer is the sure way.
Here are a few tips that may help you obtain a good purge for the stainless-steel pipe you weld.
Make certain there isn’t any water inside pipe…not even a drop. One single drop of water will throw a monkey wrench inside your purging until it evaporates. Remember what is in water? Hydrogen and oxygen.
Poke a vent hole inside the uppermost placed you can discover. Imagine argon just as if it absolutely was water. Because it is heavier than air, it’s going to refill any space like water, displacing mid-air since it fills every nook and cranny.
More purge gas flow isn’t necessarily better. An increased and turbulent flow of argon will not necessarily purge a pipe quicker than the usual lower flow rate. As well as a diffuser on the end of the end of the argon hose usually allows you to work with a higher flow rate. A homemade diffuser can be made with many metal wool , some perforated stainless sheet, as well as a little sheet metal.
After you verify a fantastic purge, you’re 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 are in place.
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