Abstract: Lap beam connectors for allowing two beams to be joined together without having to use external fasteners such as screws. Each beam has at least one internal pair of receptacles for slidably receiving each end of a plate therein. The plate can be secured to inner walls of the beams by a crimping tool, and the like. The plate allows the weight of the beams and any structure being built to be distributed over the length of the beam instead of just being directly on the ends of the beams. The receptacles can be substantially U-shaped with triangular shaped sidewalls. Another part of the invention allows for attaching two U-shaped beam half sections together by having a nesting ledges/receptacles on at least one of the legs of one beam half sections. While the legs of each beam half overlapped against each other, the nesting ledges/receptacles hold the beam half legs to be held to fixed locations.

Abstract: Lap beam connectors for allowing two beams to be joined together without having to use external fasteners such as screws. Each beam has at least one internal pair of receptacles for slidably receiving each end of a plate therein. The plate can be secured to inner walls of the beams by a crimping tool, and the like. The plate allows the weight of the beams and any structure being built to be distributed over the length of the beam instead of just being directly on the ends of the beams. The receptacles can be substantially U-shaped with triangular shaped sidewalls. Another part of the invention allows for attaching two U-shaped beam half sections together by having a nesting ledges/receptacles on at least one of the legs of one beam half sections. While the legs of each beam half overlapped against each other, the nesting ledges/receptacles hold the beam half legs to be held to fixed locations.

Abstract: An ultrasonic apparatus and method for testing a material comprises an oscillator which generates a selected frequency in the ultrasonic range. A transducer is connected to the oscillator for applying an ultrasonic signal to the material and for receiving an echo signal back from the material. Two phase detectors are utilized one of which receives the echo signal and an in-phase oscillator signal to generate a first display signal, and the other of which receives a quadrature signal which is 90.degree. out of phase from the oscillator signal, as well as the echo signal to generate a second display signal. The first and second display signals are utilized in a visual display such as a cathode ray tube, to generate an image. The image changes according to the phase shift between the ultrasonic signal transmitted into the material and the echo signal, which, in turn, can be utilized to determine the presence and depth of a flaw or boundary in the material.

Abstract: An ultrasonic testing method and apparatus stores the reflected ultrasonic signals from each of a plurality of locations along a scan path over a piece of material to be tested. For each individual location, the reflected signal at that location is added to contributing signals from each other location to produce a composite signal which has a good signal-to-noise ratio. The contributing signals from each other location is formed by multiplying the signal of those other locations by a corrective phase shift factor which is a characteristic of a time delay for a reflected signal from the other locations to the individual location of interest. The contributing signal from each other location thus represents a rotated reflected signal from the other locations.