Abstract: The present invention provide a carrier for development of electrostatic latent images, comprising magnetic powder dispersed in binder resin, the carrier having a mean particle size in a range of 30 to 80 .mu.m and satisfying the following relational expression:(x).sup.2 /.phi..sup.2 .gtoreq.9.0wherein x represents mean particle size of the carrier and .phi..sup.2 represents variance of particle size distribution.The carrier of the present invention is superior in chargeability and fluidity and free from occurrence of carrier adhesion even when used in combination with small particle size toner and which can form excellent copy images.

Abstract: In order to join by welding shaped parts, in particular, of cast superalloys based on nickel or cobalt, without cracking, by means of a beam of energy, preferably an electron beam, according to the invention the weld zone and an adjacent area of adequate size, often the entire part, are heated to a preheat temperature between 1000.degree. to 1250.degree. C., preferably between 1070.degree. and 1180.degree. C., and maintained at this temperature at least until the temperature is at least extensively equalized. The weld surfaces in contact with each other are then melted and welded together by means of the energy beam. Subsequently, the weld zone and the adjacent area are cooled uniformly.In this manner, a welded joint is obtained having mechanical properties that are equal to or only slightly reduced compared to those of the initial material and containing no pores or cracks.