How To Weld Stainless Steel To Copper. This is to show what welding rod needs to be used for welding non ferrous metals to stainless steel can be used to weld brasscoppersteel together with lo. You should try gas backing the outside when you weld the inside.
I use silicone bronze for large welds but fusion weld small ones. An important aspect of welding stainless steel to copper is the physical design of the joint. You will need a TIG torch.
Concentrate your heat on the copper and drag your pool to the stainless.
I have someone hold a gas line on the back of weld about 5-10 psi. I use silicone bronze for large welds but fusion weld small ones. To weld the ferritic stainless steels filler metals should be used which match or exceed the Cr level of the base alloy. There probably will not be a weld nugget formed.