Abstract: A process for laser welding a cover and a casing, each made of aluminum or an aluminum-based alloy, via a nickel layer plated thereon, thereby forming a package for electronic devices, the process comprising the steps of: boring holes in sides of the casing, thereby providing holes through which input/output and source terminals can be inserted and be soldered hermetically to the casing; plating a nickel layer on the surface of the casing; mounting electronic devices in the casing and forming necessary connections between the devices and the terminals; and, welding the cover and the casing together by pulsed YAG laser beam, thereby forming a weld zone containing 1.5 to 10.0% of nickel by weight, and sealing the cover and the casing hermetically.

Abstract: The brittle nature and magnetic properties of the rare earth cobalt magnet are improved by the simultaneous addition of Cu and V. Cu and V are included in amounts of from 0.5 to 6% by weight and from 7 to 19% by weight, respectively. The simultaneous addition enables the rear earth cobalt magnet to be cast in the form of an article. In addition, the simultaneous addition not only improves the mechanical properties of the sintered article, in which form the conventional magnet was available, but also the magnetic properties, such that, for example, the coercive force is increased when the molar ratio of cobalt with respect to rear earth elements is great.