I had a local welder weld in a 2" tri clover fitting into my brew pot. Unfortunately, I probably should have done a bit more research to find a better welder. I am almost 100% certain the weld isn't sanitary and in addition to this, there seems to be a lot of black scorched stainless filler on the inside of my brew kettle from the weld. I'll post pictures when I get a chance.
My question, is the weld safe to brew with? Will it impart any negative flavors and/or hazardous material into my brew. Is the weld salvageable, such as grinding down the extra build up. Finally, if the weld is salvageable, what material would be best to use to grind down the build up? Due to the confined space, I will most likely use a dremel, I am just wondering what the best grinding wheel would be.
Thanks in advance for any insight.
Greetings rednender - what you’re seeing inside your kettle is known in the Stainless Welding World as: “sugar”. Sugar is that black crusty scale that built up on your kettle and it’s caused from oxidation. Welding stainless steel, while tricky and difficult, is done through a method known as TIG, which stands for Tungsten Inert Gas. It’s the inert gas part that your welder did not use effectively when welding your fitting.
You see, in order to properly weld stainless steel, the inert gas is present around the tip of the tungsten while making the weld. This protects the weld itself from becoming sugared. In all cases where stainless steel is welded, inert gas must be present on the
inside of the weld as well. And that’s where your welder failed.
In order to make a proper weld on a stainless pipe, fitting, kettle, or anything else, the inside of whatever is being welded must
not be exposed to oxygen while the weld is being made. To accomplish this, the welder uses an inert gas, such as Argon, to continually purge the inside of the weld while the weld is in process.
Eliminating sugar after the weld is very difficult. However, you should be able to get most of it off with your Dremel and a sanding wheel, or disk. Unfortunately, in your case, it is what it is. My hope is that the information I have provided will help future brewers who wish to make modifications such as this to their stainless steel.
Good luck!