new still 35 qt stockpot... how to cut lid?

[justinm001]

Bought a 35 quart ss stockpot and should be great. Also bought 12" ss thing like an ice bucket. I want to cut a hole and weld ot to the lid. Then put copper piping on top of that. I did this with my 20qt and it worked well, I used welder and dremel cut off wheels to make it, but it wasnt perfect and leaked, so had to use that flour paste every time and was a bit of pain.


what should I use to curt large round hole in lid? What should I use to weld together?

also before the copper pipe would get loose when moving. Is there a union or bung that works best to go from hole in ss to copper fittings? I was thinking male on inside and female on outside then weld/braze together.