Stainless Steel Pipe Welding

Welding stainless steel pipes is a job that’s easy. It has always been. Always will be.

What separates the true welders and the rod burners, or men from the boys? It is their willingness to follow the procedures for welding stainless steel . These procedures include waiting for the pipe’s to cool between passes, shielding the hot tip with argon, trimming the tip of your tig welding rod if it gets clogged up, and keeping your tungsten sharp.

To prevent sugaring, stainless steel must be purged with an argon gas. You can also call sugaring granulation, but it is still severe oxidation.

Without an argon purge to shield the inside or back of the pipe, you can’t even tack weld. So how do you do it? How can you protect your backside with argon

Solutions for stainless steels welding & cutting applications | Oerlikon
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These are some tips to help you give your stainless steel pipes a thorough purge.

You must ensure that there is not even one drop of water in the pipe. A single drop of water can cause a major problem in your purging process. Keep in mind what’s in water. Hydrogen and oxygen.

Find the highest vent hole you can find. As if argon were water, It is heavier than air and will fill any space as if it were water.

Not all purge gas flows are equal. An increased flow rate of argon is not always better. A diffuser at the end your argon line allows you to use a higher flow. You can make your own diffuser using stainless steel wool, perforated stainless sheets, and some sheet metal.

After you have completed a thorough purge, you can begin to tack. You can peel the tape back to tack, then let it cool down a bit before re-taping. Next, tack the tape again 180 degrees apart. Continue to tack until all tacks have been placed.