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| mattinker:
Hi Andrew, I would silver solder stainless to copper, soft solder would work; but I think silver solder would be better! Cheers, Matthew |
| Sea.dog:
I think that it would need to be silver solder. The flux needs to be quite aggressive, too. |
| awemawson:
Trouble is that it's a blooming great heatsink! I'm wondering if something like Permabond 910 would work. Recently there have been several bonding glues put on sale but all specifically say for copper plumbing and I can find no mention of any other metals. But Permabond 910 is specifically for bonding metals including both stainless and copper, but abrasion is recommended presumably to give a better physical key. https://www.permabond.co.uk/product-page/permabond-910-for-metal-1-x-20g-bottle |
| nrml:
Soft solder might be a good starting point. It would need lower temperatures to get it to flow. Seems to be very popular for stainless steel in the small scale brewing circles. |
| awemawson:
Yes that's my preference as the temperatures are more easily attainable, but I'm not sure what flux is aggressive enough for stainless. I've seen one based on phosphoric acid and others based on zinc chloride. I've also seen a video of someone using 95% tin 5% antimony solder but can't source it this side of the pond. Obviously I have access to normal 60/40 lead tin, and the new 'lead free' solder - I did an experiment on a stainless fitting with the lead free and it's normal plumbing flux but it wasn't very successful. Zinc chloride is supposed to be good but apparently a bit nasty fume wise and needs a good post operation flushing. |
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