Wean United, Inc.

James F Deffenbaugh

Method and apparatus for detecting whether or not the gap in adjoining ends of a ring-like workpiece to be flash welded is of normal size, or is so much larger as to produce an unsatisfactory weld. The invention provides means whereby the amount the movable platen of a flash welder moves in a direction toward the stationary platen is compared with its position when the ends abut and flashing begins. If the ends are not materially beyond a predetermined normal gap, the welding action proceeds; however, if the ends are spaced beyond such normal gap, further action of the flash welding process is aborted, or a signal is activated; or both abortion and signal are provided. The invention is especially adapted for use in welding rings which are formed and welded in high production, such as rings that are further processed to make rims for tires of a vehicle.

Flash welders

Means for monitoring the energy used in flash welding operations wherein two signals are simultaneously fed to the input of a multiplier, one signal being substantially proportional to the welding current, and the other being substantially proportional to the welder transformer secondary voltage applied to the work. The output of the multiplier is fed to an integrating amplifier circuit and the output of the latter is fed to a level detector amplifier. Voltage changing means is used to change the sensing level of the level detector amplifier to in turn affect operation of indicating means to indicate the sensed level.

Growing community of inventors

Warren, OH, United States of America

James F Deffenbaugh