Welcome to Tea with DidiNov 21, 2019
Vilhelmsen Nyborg posted an update 9 months, 3 weeks ago
Stainless-steel pipe welding is gravy work. Has always been. Always is going to be.
If you can undertake it and take action well, you are man and you will probably never go hungry. But it takes some attention to detail to get it done right.
The most important thing that separates the lads in the boys or can i say, the genuine welders from the rod burners may be the willingness to check out procedures for welding stainless. Procedures like awaiting the pipe for cooling involving passes, maintaining your hot tip in the rod shielded with argon, snipping the tip in the tig welding rod when it gets crapped up, maintaining your tungsten sharp.
One of many procedures I am talking about is PURGE. Stainless-steel absolutely must be purged with argon gas to prevent sugaring. Sugaring can be called granulation but it’s severe oxidation no matter what you think of it as.
You cant even make do with tack welding without an argon purge that shield the trunk side or inside the pipe. How do you undertake it? How can you protect the trunk affiliate with argon?
Usually it is finished with aluminum duct tape. The ends of an stainless pipe are taped shut and also the whole inside is purged with argon gas. Perhaps the opening within the pipe joint itself is taped in order that argon can fill your entire pipe and push out any oxygen. The tape is peeled back adequate to obtain a tack once the pipe is purge enough.
Precisely what is enough? The only method to tell for sure is with an oxygen analyzer. A bic lighter will not do just fine. Even 2% oxygen content will fly out a bic lighter. And 2% oxygen can result in a black root pass.
There are a few other smart solutions to look at the purge but an oxygen analyzer could be the sure way.
Here are a few tips that may help you obtain a good purge about the stainless pipe you weld.
Make sure there is absolutely no water inside the pipe…not a drop. A unitary 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 from the uppermost place you can find. Think about argon like it was water. Because it’s heavier than air, it will complete any space like water, displacing mid-air mainly because it fills every nook and cranny.
More purge gas flow is not always better. A high and turbulent flow of argon is not going to necessarily purge a pipe quicker than a lower flow rate. And a diffuser for the end with the end of your respective argon hose usually allows you to make use of a higher flow rate. A homemade diffuser can be achieved by incorporating stainless steel wool , some perforated stainless sheet, and a little bit of sheet metal.
Once you verify a fantastic purge, you are to tack. Peel the tape back sufficient 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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