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| mattinker:
Andrew, Pure zinc sheets are used a lot on roofs here. The French Zinc workers flux which I've used successfully on a wide variety of metals including stainless, is made by putting small bits of zinc in a glass jar, you then add hydrochloric acid, let it fizz, set fire to it and then smother to put it out! It's a nineteenth century method that works really well, sounds like your zinc chloride! I would favour the 60/40 over the 95%tin 5%antimony it will flow better! Cheers, Matthew |
| hermetic:
lead free is piss poor Andrew, SS is a fairly poor conductor of heat, if you can get some flux for SS, and it should be a plumb centre item , I would use ordinary plumbing solder, the copper will pull the solder in and when the ss is hot enough it will be done! might need mapp, but you also have O/A! a google produced this: Stainless steel can also be soldered or brazed to itself or to brass or copper, with good results. These processes provide good alternatives to the welding of stainless steel fittings. But personally, I would solder it, as you can see the solder drawn into the joint, and add more, whereas the brazing metal tend to sit on top in the gap between the pipe and the boss, and could crack given the vibration from the pump. Long shot, but could you put a thread in it, and make up a bush to suit your plumbing sizes? |
| hermetic:
Matttinkers flux is "killed spirits" AKA "bakers fluid" I have just been shouted from upstairs that the maths lesson the wife was conducting on our bed with youngest daughter is now over, and tea and coffee is required, knowing full well which side my bread is buttered on, I am off to do my duty, Laters, as the young ppl say! Phil |
| WeldingRod:
I would use "acid flux" for plumbing. Its Zinc chloride. I would scour the places you want to solder on the sst to bright metal, then glove up and sand it again, Wetted with flux. I would pro-gun the sst by itself, so you can be 100% sure that you actually got it to wet. Once that's done, it's any easy.soldeting job to stick on the copper. Lots of cleaning, of course... Sent from my SM-G892A using Tapatalk |
| RussellT:
Hi Andrew I was a bit surprised when you said you couldn't get 95%tin 5% antimony solder. I thought that was lead free plumber's solder - well maybe it was when I last looked - it was one of those handy bits of information - like you could use it for mending aluminium. Anyway I did a bit of searching. The key thing for searching seems to be that it is grade 95A. I found several UK manufacturer's sites listing it who might be worth a call, but the only place I found where you could order it on line was here but in the wrong form: https://www.soldersonline.co.uk/search.aspx?search=95A While looking at that site I also saw that they list fluxes for stainless, here's one: https://www.soldersonline.co.uk/detail.aspx?id=110 They also list solders for stainless. Russell |
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