Abstract:
In order to detect can weld side-seam flaws or defects an infrared sensitive detector head is used. A collimator fiber optics or an optical mask are used to give a higher resolution. Optical fibers may have a second coating of EMA or an occasional optically absorbent fiber may be placed parallel to the optic fibers in order to cut down crosstalk and introduce an absorbent medium between the fibers. Coherent fiber optics may be used.
Abstract:
An electronic circuit for receiving the output of one or more detector units which may pick up the infrared emission from a welded seam as it passes by the detector unit or units. The circuit sorts out high and low signals to give an indication of hot or cold spots which indicate deficient welding. The signal is used to operate indicators, counters, and a weld reject mechanism or marking means.
Abstract:
This disclosure relates to electrohydraulic transducers of the type where electrical energy is discharged across a gap between a pair of electrodes to create a shock wave which expands a flexible chamber to urge a tubular workpiece telescopically externally thereof into conformity with a mold cavity, and includes an internal cage structure for supporting the chamber and at least one of the electrodes, and means for clamping the tubular workpiece at a predetermined position relative to the cavity prior to a forming operation.
Abstract:
A SQUARE WAVE POWER SUPPLY USED IN PRESSURE SEAM WELDING OF AN BODIES. PHOTOELECTRIC CELLS DETECT THE PRESENCE AND LOCATION OF CAN BODIES PASSING BETWEEN PRESSURE ROLLER ELECTRODES TO ACTUATE SOLID STATE SWITCHES. A THREE PHASE A.C. SOURCE IS RECTIFIED AND FILTERED TO PRODUCE A SOURCE OF DIRECT CURRENT. AN OUTPUT TRANSFORMER AND A FIRST SCR ARE CONNECTED IN SERIES ACROSS THE DIRECT CURRENT SOURCE. CONNECTION OF THE OUTPUT TRANSFORMER WITH THE DIRECT CURRENT SOURCE IS CONTROLLED BY TWO TIMING CIRCUITS, ONE OF WHICH CONTROLS THE CONDUCTION DURATION OF THE FIRST SCR AND THE SECOND OF WHICH CONTROLS THE BLOCKING DURATION OF THE SCR. CONDUCTION OF THE SCR IS TERMINATED BY A POSITIVE QUENCHING THEREOF THROUGH THE APPLICATION OF A VOLTAGE ACROSS THE SCR GREATER THAN AND IN OPPOSITION TO THE VOLTAGE OUTPUT FROM THE DIRECT CURRENT SOURCE. A SUBSTANTIALLY WELL DEFINED AND CONSISTENT SQUARE WAVE OUTPUT IS PROVIDED BY PULSE-SHAPING CIRCUIT ELEMENTS IN COOPERATION WITH THE OUTPUT TRANSFORMER AND SCR AND BY ESTABLISHMENT OF A PRELIMINARY FLUX LEVEL IN THE OUTPUT TRANSFORMER PRIOR TO THE INITIATION OF AND UPON TERMINATION OF A TRAIN OF SQUARE WAVE OUTPUT CURRENT SIGNALS. AN OVERLOAD TIMING CIRCUIT PROTECTS THE SUPPLY BY TERMINATING THE INPUT THERETO.