Abstract
A head of the golf wood club is hollow, and its thickness at the contact point to a ball is very small as like 2mm in order to get a high repulsive power. Although the lost wax method, which is one of manufacturing methods, is easy to mold it, there is fear of producing micro shrinkages. The micro shrinkages can give rise to early fracture in service, depending on their sizes and locations. In this study, in order to investigate whether the infrared thermograpy with pulsed heating can be applicable to detect their micro shrinkages near the surface, some test pieces with a small hole were prepared, and some experiments and nonsteady heat conduction analysis were carried out. The results show that it is easy to detect for the defects whose diameteris 1mm when the defects exist very near the surface as like 0.2mm.
