Visol Brushed Stainless Steel Black @ Amazon.com
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Stainless steel pipe welding is gravy work. Always has been. Always will be. If you may do it and do it well, you are the man and you will never go hungry. But it takes a good deal of attention to detail to do it right. The main thing that separates the men from the boys or ought to I say, the real welders from the rod burners is the willingness to follow procedures for welding stainless steel. Procedures like waiting for the pipe to cool in amidst passes, keeping the hot tip of the rod shielded with argon, snipping the tip of the tig welding rod when it gets crapped up, keeping your tungsten sharp. One of the main procedures I am talking in regards to is PURGE. Stainless steel utterly has to be purged with argon gas in order to prevent sugaring. Sugaring is likewise called granulation but it is severe oxidation no matter what you call it. You cannot even get away with tack welding without an argon purge that shield the back side or inside of the pipe. So how do you do it? How do you protect the back side with argon? Usually it is done with aluminum duct tape. The ends of a stainless steel pipe are taped shut and the whole inside is purged with argon gas. Even the opening in the pipe joint itself is taped so that argon may fill the entire pipe and push out any oxygen. The tape is peeled back just sufficient to get a tack once the pipe is purge enough. What is enough? The only way to tell for sure is with an oxygen analyzer. A bic lighter will not do the trick. Even 2% oxygen content will blow out a bic lighter. And 2% oxygen will result in a black root pass. There are numerous other down and dirty ways to check the purge but an oxygen analyzer is the sure way. Here are a few tips that will help you get a good purge on the stainless steel pipe you weld.
Once you verify a good purge, you are ready to tack. Peel the tape back just sufficient to tack and let cool a bit and re tape. Then tack again 180 degrees apart. Continue until all tacks are in place. More tips for welding stainless pipe…
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