Electric heating – Metal heating – For bonding with pressure
Patent
1994-02-18
1996-02-20
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219 8641, B23K 1124
Patent
active
054930936
ABSTRACT:
A method and apparatus are disclosed for monitoring and controlling a multi-gun resistance welding apparatus. An embodiment of the system comprises a computer which executes a routine that allows supervision of the multi-gun welding system, a programmable logic controller which controls movement of the guns and gun delivery devices, gun sensors which measure the displacement of gun electrodes, delivery device sensors for determining a location of the gun delivery devices, fixture sensors for measuring the location of a workpiece fixture, a weld controller which applies power to the gun electrodes, and an analog-to-digital converter which converts the outputs of the sensors to digital signals readable by the computer. An embodiment of the weld routine executed by the computer spatially gauges the pre-weld fit-up of the workpieces and inhibits the application of weld power if the fit-up is not within a specified tolerance. The embodiment of the routine detects stuck gun conditions after the weld, and performs a weld analysis to diagnose various faults during the welding based upon electrode position. An embodiment of a retro-fit gun sensor is presented which utilizes an electrode positioning bracket coupled to the electrode. The position of the bracket is measured by means of a linear variable displacement transducer. Using the retro-fit gun sensor, the computer-integrated welding system can be readily incorporated into commercially-available multi-gun welding systems.
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