The condition and composition of the solder varies with rising or falling temperature conditions and optimum strength and result cannot be guaranteed unless the appropriate temperature is reached. A practical temperature for soldering is a temperature at which the internal composition of the solder does not change at all before it is heated. When excessive heat is applied, both strength and reliability are reduced due to compositional changes. The melt also flows differently at different temperatures and when heat is applied at the correct parameters, the flow will first flow to the solder position and remove the surrounding oxide layer and impurities, improving the tightness of the solder.
However, laser soldering is still a little used method due to its parameters.
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