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Why does molten solder squeak when you move the iron in it?

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tooki:

--- Quote from: Infraviolet on November 30, 2022, 08:53:50 pm ---… but I thought the whole reason for lead, or other non-tin metals in solder alloys was to prevent pure tin's irriating behaviours (tin whiskers and such) and that this suppressed the effects which caused the tin cry at the same time.

--- End quote ---
And lowering the melting point. The melting point of e.g. 63/37 tin-lead solder (183°C) is significantly lower than that of pure tin (231.9°C) or pure lead (327.5°C).

eti:

--- Quote from: coppice on November 30, 2022, 08:06:41 pm ---
--- Quote from: eti on November 30, 2022, 11:27:20 am ---Why does molten solder squeak when you move the iron in it? If you dragged a cold soldering iron across a cold solder joint it would not squeak in the same way. Is this because the state of the solder is liquid causing some sort of mechanical change? This has always intrigued me.

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I think it only makes noises when its on the edge of melting, as the molten and not quite molten parts of the blob interact. Freely flowing solder seems quiet.

--- End quote ---

Yes precisely right!

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