Hi People,
Of late there have one or two posts on the subject of welding and brazing.

I noticed that people may not realise there is a subtle difference.

Brazing is using the brazing filler rod, as one would use solder. In other words the parent metal, that metal to be joined does not melt and does not become fused together with the filler metal.

However in Braze Welding the filler rod melts and it mingles with the parent metal and truly becomes intermixed. When parent and filler rod melt togther they are considered braze welded.

Filler rods are often fluxed for reasons of economy or our health and safety but most operators agree they are not a patch on the old unfluxed rods that required a tin/ plastic bottle of flux.

Both of the welding/brazing operations had to contend with the zinc component of the brazing rod. The underlying problem is/was that the very small difference between the zinc liquid temperature and when it turned to gas.

The operator had to be extremely careful in keeping the temperature beneath that of when the zinc could flash off ( turn to gas) or the job was ruined.

Grahame


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