I have been welding and fitting for over 30 years and have welding ss lots of times. I sent the truck driver one day to go get some ss rods so I could weld some pins on a crane boom. he called me up and said the guy at the welding store needed to know if I was welding ss to metal or metal to ss because it was diferent rods for each process????? I took it as a joke because it can go both ways metal to ss or ss to metal. have I missed something over the years or what? in my shop I just use reagular ss rods or most times I just run ss wire through my mig with tri-mix.