Image Number 2 for United States Patent #3945101.
Sheet metal rotor wheel for radial-flow fans, turbines, and the like, and method and fixture for manufacturing same by use of explosion welding of a rotor dish to angled legs of the individual rotor blades. The individual rotor blades are formed of a T-shaped cross-section by joining two L-shaped cross-sections together by spot welding, brazing, or the like. The blades are then positioned in a fixture in predetermined relative positions corresponding to their final positions on an assembled rotor wheel. The fixture includes a rigid outer ring having an inner radius corresponding to the outer radius of the rotor wheel. The fixture also includes spacer members having gaps therebetween for holding the blades in position within the ring. The spacer members have an outer configuration corresponding to the configuration of a rotor dish, which rotor dish is held at a spacing from the angled legs of the blades, the rotor dish being covered with a layer of explosive material. The explosive material is then ignited at the point of the smallest diameter of the rotor dish, with a subsequent explosion welding of the rotor dish to the angled legs of the blades. The fixture includes grooves for accommodating the angled legs of the blade during the welding step.