Abstract: A method, in the art of brazing metallic parts to one another, including a step of subjecting a brazed assembly to relatively high temperatures over a relatively short period of time in a manner to induce blistering of unbrazed or weakly brazed areas. Blistered material can then be removed, leaving a soundly brazed structure which in use will not fragment and give up loose materials to ambient surroundings.

Abstract: A plating preparation method in which a nickel part is placed in an electrolyte bath of such acid concentration and such temperature as to promote thorough etching of the part surface and in which an etched part is allowed to soak in the same electrolyte bath for a period of time sufficient to dissolve formed metallic oxides. A coating of a base material is applied to the part following removal from the etching bath, the base material achieving a close intimate contact with the part surface and penetrating and interlocking with recessed areas of such surface.