Filler for disimilar metals?

Tue, 31 Aug 2021 14:38:30 GMT

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I'm trying to make a bit of an arty project for my brother and his misses for a family christmas present. Part of the task is welding coins to a piece of stainless steel. Australian coins are made-up of 75% copper and 25% nickel and I'm at a loss as to what filler to use. I have some Mang Bronze brazing rods and that just turned to puss on me. As soon as the filler and stainless got hot it fizzed and made a big mess. I was thinking Silicon Bronze but its going to be hard to get hold of and I don't even know if it'll work. So if you have any idea what might work then let me know and I'll be trying to get hold of it. ThanksBen
Reply:"Engloid" and "chopper5" here provide insight into TIG'n cupro-nickel alloy at http://weldingweb.com/vbb/showthread.php...-Copper-Nickel.  Someone here has prob joined these metals via GTAW or GMAW.  What grade stainless are you using? 304, 316??Never TIG'd 75Cu/25Ni or Monel to stainless steel, but recommend contacting Lincoln Electric or ESAB for a free tech consult.  Know a few pros at ESAB that will def be able to help you.  PM me if interested.Last edited by ManoKai; 12-21-2013 at 05:07 AM."Discovery is to see what everybody else has seen, and to think what nobody else has thought" - Albert Szent-Gyorgyi
Reply:I think my best bet will be to braze with the tig over proper fusion with the big. If no one else has any experience on here then I'll be trying someone at the local supply shop or maybe see if the useless clowns at Lincoln australia have any info.
Reply:I'm thinking silver solder myself. It's a good choice for copper to stainless..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:If it is just an art piece, I would try soft soldering.  First, try to tin one of each piece (degrease, make it shiny, apply flux, heat to appropriate temperature, apply solder, wipe it off with a paper towel while it is still wet).  If you can tin a piece, you can solder a piece.Remember CLEAN, CLEAN, CLEAN.  Wipe every piece down with 91% isopropyl alcohol (available for cheap at your local pharmacy). Then use a scruffy pad or stainless wire brush to make the metal shiny where it will touch.So, if you find that solder will work on all your pieces:  degrease, make it shiny, apply flux, heat to the appropriate temperature, hit it with a dab of solder (regular old 50/50 will be plenty strong for what you are doing), let it cool and you are done.You could do this with a soft Oxy-Acetylene flame and a small tip, or a large, electric soldering iron, or a butane soldering iron, or a furnace-heated soldering copper.KevKevKevin / Machine_Punk from The Aerodrome Studio - Lincoln PowerMIG 210 MP - Meco N Midget w/custom welding station - Vintage Victor 100Current Projects: The Aerodrome Studio
Reply:I would say si bronze. If you were closer I would mail you some. If you don't mind a six week wait for a delivery PM me your address. Coins are weird tho, at least over here they have a lot of zinc in them which causes the fizz deal. Last year just screwing around I wanted to make a spare change bowl actually out of change. I thought it would have been a cool illusion piece. That idea went out the window in about 16 cents! LOLI hate being bi-polar it's awsomeMy Heroes Have Always Been Cowboys
Reply:Thanks for the replies. I've got a bit of silver solder here so I'll try that. I was wanting to have a nice bronze ring around the coin to add a bit of colour to the piece. I suppose it u use enough silver solder there would be a small bit of colour visible. If it works out the way I want, I'll post up the finished product.
Reply:Ben, I don't know what coins you are trying to weld but we weld Aus 10c pieces to cap 25mm diameter SS tubing as you can't make anything for that price.The weld quality varies from coin to coin unfortunately but for our application it's ok.I generally just use 308L 0.9mm or 1.2mm Mig wire cut to length and straightened and around 40ish amps for a corner to corner weld when capping the tube.As a general rule I also linish the edge of the coin around its circumference.Regards Andrew, also from Oz.We are Tig welders, gravity doesn't worry us.Miller Dynasty 350. 350 amps of awesomeness.OTC AVP 300 hybrid wave AC/DC inverter tig. (now retired)Kemppi MLS 230 amp for home, a sweet little AC/DC Tig
Reply:SiB would be my suggestion too.  Did this on my workbench."Desperation is the raw material of drastic change." - WB   #changeIbelievein #fbf #weldology #contrast #philosophy #weldporn #millerwelders #workbenchBanksy by Brown Dog Welding, on Flickrbrowndogwelding.com@welderassassinMy Blog on The Fabricatorfacebook.com/BrownDogWelding