Abstract: Nondestructive object testing is carried out in a magnetic aspect as by leakage-flux detection and in an ultrasonic aspect by electromagnetic acoustic wave generation and detection, portions of magnetic flux being derived from a common source for the respective magnetic and ultrasonic testing.

Abstract: A system for transporting tube or bar stock along its horizontal axis comprising conveyor sections and a drive section each section containing a series of rotating drive assemblies. The drive assemblies contain a pair of frusto-conical rollers upon which the tube or bar stock rides. These rollers engage threads of opposite hands disposed on opposing portions of a driven shaft with respect to the axis of transport. Means for rotationally connecting and disconnecting the shaft and rollers such as locking pins or clutches are provided. Means for preventing the rotation of the rollers such as disc brake assemblies or stop bars which contact radially protruding members rotationally connected to the rollers are provided. When the rollers and shafts are rotationally connected and free to rotate, the work piece is transported.

Abstract: Non-destructive testing apparatus for rollers and the like of magnetic material comprises a pair of rotating spin rails having intermediate sections of magnetic material. Feeding apparatus deposits rollers on the spin rails and moves them successively past the magnetic sections. A magnet produces flux through the magnetic sections and a roller rotating thereon. Variable reluctance sensing apparatus senses changes in the flux. An eddy current test probe is positioned adjacent the magnetic sections. Variable reluctance and eddy current test circuits produce flaw output signals which control apparatus for segregating the rollers. Advantageously the feeding apparatus intermittently deposits successive rollers on the spin rails and intermittently moves the rollers along the rails in end-to-end relationship.

Abstract: In apparatus in which an object moves longitudinally and rotationally with respect to a multi-probe assembly, each probe including a channel-shaped core of magnetic material having spaced sides which are long compared to the thickness thereof and a coil encircling the core, and bipolar signals are developed whose positive and negative excursions correspond to the largest flaw signal of each polarity simultaneously occurring in the probes, the probes of the assembly are arranged in succession along the longitudinal path of travel of the object and skewed with respect to the longitudinal path of travel with an end of one probe adjacent the end of the next probe to yield flaw indications for longitudinal defects which are largely dependent on the depth of the flaw and independent of its length. Accordingly such indications are approximately the same as for short defects of the same depth, thereby yielding indications more nearly corresponding to the severity of the defects.