Abstract: An aluminum electrical conductor is electrically joined to a copper electrical conductor by a cold weld lap joint which is substantially free of copper-aluminum intermetallic compounds. The overlapped portions of the conductors are deformed at least 74% and no greater than 82% to achieve a weld joint which has both excellent physical properties and excellent electrical properties. The cold weld lap joint is a reliable electrical connection for electrical circuits experiencing current densities of more than 1000 amperes per square inch and a sustained high temperature of 125.degree. C. and above.

Abstract: Methods are disclosed for more practical construction of liquid-cooled buckets able to efficiently transport heat energy from the inside of the airfoil skin surface in contact with hot gas to the outer surface of preformed tubes recessed into the bucket core, through which tubes liquid coolant is passed during operation. The bucket is made of a series of preformed solid components, which are assembled, consolidated and then converted into a unified structure. In each arrangement illustrated one of the preformed solid components is a flat bimetallic sheet comprising an erosion, corrosion resistant layer and a layer of high thermal conductivity, these layers being joined by an optimized metallurgical bond.

Abstract: An annular composite joint of wire and braze alloy fluid-tightly seals the bucket of a gas turbine to the root sidewall piece bridging the space provided between the two parts to eliminate the necessity for close tolerance fit.