Mean time between failure (mtbf) is a basic measure of reliability items. it can be described as the number of hours that pass before a component, assembly, or system fails.

The power source in a certain welding setup generates 3500w that is transferred to the low carbon steel work with a heat transfer factor of 0.85. the melting factor in the operation is 0.45. a continuous fillet weld is to be made with a cross-sectional area of 23 mm2 determine the travel speed at which the welding can be accomplished.