Abstract
The combination of welding condition (optimum welding condition) which produced maximum tensile strength of S45C carbon steel friction welded joint under the notched tensile test specimen condition was investigated using response surface method.
As a result, the combination of welding condition to yield maximum tensile strength at the weld was attained through a steepest ascent path. And, a second-order equation predicting the weld strength was accurately established.
By the result of confirmation experiments using the predicting equation, a successful weld was obtained under the optimum welding condition. But, the optimum welding condition requires comparatively larger burn off quantity. Therefore, it is needed to consider a economical view such as less burn off quantity. Moreover, the observation of the successful welds showed that a fine grain ferrite perlite layer having comparatively low hardness widely distributed over the heat affected zone of the weld.
