Spot welding brass

In full compliance with Murphy's Law I just tried to unscrew a brass (might
be bronze - how do you tell?) shaft from a tripod and twisted the top third
off. My options look like either 1 - make a new piece from scratch, or
2 - hold the top and bottom tightly together (very clean break, about 3/8"
diameter contact area) and zap it with a spot welder.
Option 2 is much less work. Any comments on whether this would work?
Reply to
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Spotwelding any copper compound is going to be real real tough unless you have a truly monumental spotwelder. Even aluminum requires a machine that costs like $50k.
I'm just learning about spotwelding is why I'm shooting off my bazoo about it lately.
Reply to
Grant Erwin
I've tacked aluminum sheet using a 220V Miller spot welder. Copper might be a problem though because the tips on the welder are made of it!
Grant Erw> SteveF wrote:
Reply to
Tim Killian
Ditto on spot welding being a long run for a short slide...
I can't see the piece, but can you drill into the broken ends of both halves with a 3/16" drill about 3/8" deep, make a 3/4" longn steel pin "splint" and silver solder the whole thing together?
That ought to be plenty strong for that kind of application. Might even be good enough just silver soldered without the splint.
Reply to
Jeff Wisnia
No (but that's beside the point). Brass/bronze is also much, much less conductive than pure copper. An inductor estimating program I have places even red brass below aluminum in conductivity, and yellow brass and phosphor bronze between zinc and tin.
Hey Steve, ain't got any silver solder on hand? A dab of that would fix it instantly.
-- "I've got more trophies than Wayne Gretsky and the Pope combined!" - Homer Simpson Website @
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Reply to
Tim Williams
But at the expense of losing the work hardened condition of the stud. Likely to be worthless when finished because it would be too soft, and the thread could be easily screwed up with solder, too. I'd say that's a long shot. How about making a new one?
Reply to
Harold & Susan Vordos
am I missin sumpin ???Have you got the old threded end out of whatever it was in?? This involves heatin, sprayin with penetrating oil, coolin, let it sit, spray, heat, spray, cool, drill, drive in stud remover, try to twist out, repeat above procedure, if you get it out, go to the Dollar store & get a new one...
Jeff Wisnia wrote:
Reply to
Jerry J. Wass
Hmmm, true. So don't screw it in so damned tight in the first place!
Spot welding needs nice high temperatures too though, it'd have to heat much of the work (depending on shape) pretty hot anyway, no?
Well, you'd only use enough to fill the capillary crack.
-- "I've got more trophies than Wayne Gretsky and the Pope combined!" - Homer Simpson Website @
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Reply to
Tim Williams
It is really easy to weld that brass with even a poor spot welder. I've "spot welded" thousands of copper straps together by sandwitching a small flat piece of silversolder between two clean pieces of copper. Press the spotwelder's "weld" button till the brass gets hot enough to melt the silversolder.. Regular soft solder works too if strength and/or heat isnt a problem.
Reply to
Jerry Martes

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