JPS645832A - Composite metal plate excellent in vibration-damping property and heat resistance - Google Patents

Abstract

PURPOSE:To reduce the temperature-dependent property of vibration-damping characteristic and at the same time withstands the use in high temperature region and improve the vibration- damping property and heat resistance of a plate by a method wherein metal plates, which have nearly the same thickness as each other and the opposing surfaces of which are roughened mechanically or chemically and, after that, piled up so as to face to each other, are joined together by spot-welding at a plurality of positions. CONSTITUTION:Two metal plates 10 and 10 having the size of 140X60mm<2> are cut out of an SS 41 steel plate with the thickness of 3mm, for example. The surface of each plate is processed with a grinder so as to be roughened to the surface roughness of 100 S. The two piled-up metal plates 10 and 10 are joined together by spot-welding the periphery of the plats at six positions 12 and 12 with electrodes, the size of each of which is 5mm. The surface of the metal plate to be joined is roughened and its preferable surface roughness is in the range of 50-200 S. The preferable diameter of the electrode tip of spot welding is 3-8mm. The preferable number of welding position per unit area is from five to twelve positions per 100cm<2>. Vibrations interfere with each other at the contact surfaces of the metal plates, resulting in consuming vibrational energy in the form of frictional energy and consequently developing vibration-damping effect.