Phosphor copper welding rods

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jscarmozza
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Phosphor copper welding rods

Post by jscarmozza »

Can phosphor copper stick welding rods be used to join mild steel, in other words, can it be a substitute for torch brazing?
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Bill Shields
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Re: Phosphor copper welding rods

Post by Bill Shields »

no...
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jscarmozza
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Re: Phosphor copper welding rods

Post by jscarmozza »

Bill, they're phosphor bronze rods, is the answers still no?
John
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Bill Shields
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Re: Phosphor copper welding rods

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Yes...no....the phosphorus is the non steel key word..
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Steggy
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Re: Phosphor copper welding rods

Post by Steggy »

jscarmozza wrote: Tue Apr 05, 2022 7:24 am Can phosphor copper stick welding rods be used to join mild steel, in other words, can it be a substitute for torch brazing?
They might work with brazing, though I've not tried it. The flux you use will probably be a major factor in whether or not you are successful.

Question is, why braze the steel instead of weld it?
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jscarmozza
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Re: Phosphor copper welding rods

Post by jscarmozza »

BDD,I'm making the frame for Kozo's Hiesler in 1" scale. Rather than use brass bars for the frame, as he did, I used cold rolled steel but still intended to silver solder the joints, however, the fit was not tight enough so I MIG welded them and ground the welds flat before applying the gusset plates over the joints. Kozo silver soldered the gussets in place then drilled them to install decorative rivets. I glued the gussets in place then drilled them to install drive screws to simulate rivets, but it didn't work out the way I thought it would. I had big problems drilling the hard welds with #54 drill bits, broke a lot of bits. So I thought I'd start over and braze the joints to eliminate drilling into the hard welds, and I thought the Phos-bronze rods might have been a better way. John
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Harold_V
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Re: Phosphor copper welding rods

Post by Harold_V »

Look in to silicon bronze rod. It's very capable of being used as you wish, and has adequate strength. It's commonly used in TIG brazing.

H
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Bill Shields
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Re: Phosphor copper welding rods

Post by Bill Shields »

Welcome to the world of heat affected zones and hard spots.

Silver solder is the way I would go...lowest heat required and will flow...or brazing rod with borax flux...but that does not flow as well as silver solder and you are likely to get a fillet in the corner where you do not want it.

Not familiar with the finished product, so cannot offer better ideas.
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