Hard time soldering stainless steel

I have a resistance welding machine and I have been trying to solder
stainless steel 316 without success. I have set the machine from low
to high and I can not get the two part joined properly. The two parts
are a tiny 316 sheet .125" high x .125 width and a 316 mesh about
.010" thick. when I apply heat the stainless steel mesh turn black no
matter what I do. I need to know what could be done to join them and
what kind of hard solder you use for 316 stainless steel.

Luis…