SILICON BRONZE MIG BRAZING WIRE REEL SPOOL TORCH COPPER CuSi3 A5.7 0.8mm 1kg | eBay
Suitable for use with MIG welders using argon and brazing torches using flux. SILICON BRONZE MIG BRAZING WIRE. - Reel Weight: 1kg. - Material: Copper wire containing 3% silicon and 1% manganese. - Model: A5.7.
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This seems cheap, or at least in a reasonable smallish quantity not too prohibitive to buy.
I've ordered a roll to have a dabble.
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