Metal coating ductility test - using fixing flange at one end and torsion handle on other end for twisting sample tube

摘要

Metal coatings which have been deposited by electroplating or chemically are tested for ductility by subjecting the coated workpiece to a torsional stress. A rod or tube which carries the coating on its outside together with a longitudinal control line is welded at one end to a flange with two bores by which it can be located through two pins on a base. The other end is welded to a crossbar so that it can be twisted through a certain angle. A disc, connected to the base, has a circle of holes so that pin through a hole in the handle can be used to lock the test piece in torsion so that its surface can be inspected for defects. This is a simple device which can be home-made and furnishes reliable results.