Two part question - Soldering for jump rings and heat foil stamping

[JackPeter]

Hello everyone,

This is a two part question. 

I'm trying to find the most secure way to close jump rings for things like harnesses (that you'd essentially be using in the bedroom). I'm attaching chains to solid steel and brass Dee rings. They'd be used for pulling and tugging more than hanging. I brought them to a welder for tigging but the jump rings just melted. What are some of the ways you guys do it for any of your projects? I've tried soldering but I noticed it only holds to a certain extent. Also, what ways you recommend I match the color of antique brass, so the silver doesn't stand out sound much?

 

My second question has to do with foil stamping leather. What temperature do I typically set the machine to get the foil into the leather without it "bleeding"? I noticed that if I apply to much pressure I lose the design of the stamp and the foil just sort of melts onto the leather. If I don't apply enough pressure, it doesn't transfer. 

 

Any advice helps :)