Two long, silver rods (k = 400 W/mK, diameter = 10 mm) are soldered together end to end, with the solder having a melting point of 520°C. The rods are in air at 20°C with a convection coefficient of 10 W/m2K. Ignoring radiation, what is the minimum power input needed to complete the soldering? Comment on how including radiation would have affected your calculated estimate of power needed for the soldering.

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Joining Processes

It is the process of permanent or temporary joining of two metal pieces with the help of heat or pressure. Two metal parts are assembled by applying an energy source for the formation of a single unit. The obtained joined metals cannot be fragmented easily with the application of any force.