soft soldering is done at the temperature of
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450 °C
A temperature of 450 °C is usually used as a practical demarcation between soldering and brazing. Soft soldering can be done with a heated iron whereas the other methods typically require a higher temperature torch or a furnace to melt the filler metal.
Explanation:
A summary of the temperature ranges of soldering. Soft solders have a 'low' melting point, usually ranging from 90°C and 400°C whereas with hard solders, it can be anything from 450°C and 850°C. Brazing above 850°C is possible as long as the melting point of the solder is below that of the base metals.
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