Th e brazing operation is a metal-joining process that is done by heating a base metal to a high temperature and applying a brazing material to the heated joint. Th e heated base metal melts the...

Th e brazing operation is a metal-joining process that is done by heating a base metal to a high temperature and applying a brazing material to the heated joint. Th e heated base metal melts the brazing alloy, which fi lls the joint, and then solidifi es when allowed to cool. Th e brazing metal is a copper alloy in the shape of a rod of 1/8 in. diameter and 3 ft length. A schematic of the operation is provided in Figure P2.39. Th e end of the brazing rod reaches an average temperature of 1600°F. How far from the heated joint can the rod be grasped by hand—that is, where the temperature is 100°F? Take the rod to have the same properties as brass, the ambient temperature to be 80°F, and the convection coeffi cient to be 0.9 BTU/(hr · ft2 · °R).

Figure P2.39