This problem is solved by using solder to join many metals. It flows like water, almost eutectic. And easily wettable thanks to 56% Ag. Yes, it's expensive, but it's not for making fillets, it's for flowing into tiny joints and soldering. I have been using this type and brand for over 25 years. Just can't justify playing with foreign brands. I don't see much, this troy ounce lasts at least 10 years unless Lady Luck gives me more magic bullets for more money. It's easy to use. The joints need a distance of 5 to 10 thousandths. Use Harris flux, white for most and black for stainless steel. Either GTAW or flame retardant frog hair oxyacetylene. Direct the heat to the large side of the seam, then touch the smaller part to the filler. When it's hot enough, it flows like magic. Connection is a golden clue that to me is pure beauty. Very resistant to tarnishing, except halogen salts or sulfur compounds. Correct joints only show the line.