I’m here to help…
I learned how to make chains from a chain specialist many years ago. I really do enjoy making them. Yeah. I know I’m kinda sick that way 
For starters What type and temperature of solder are you using? What kind of flux and what kind of torch are you using? Are your links work hardened or annealed when you solder? Also are you isolating the links from each other as you solder them like this? And finally are you cleaning up/removing excess solder from the links as you go?
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