Chemical Engineering @ Carnegie Mellon

Andrew J. Gellman Group S.O.P.


Warning: Always wear safety glasses when spot-welding. Flying sparks can be generated during the spot-welding process.

General Procedure
  1. Make sure that the copper electrodes are held securely in place by tightening retaining screws.
  2. Remove any carbon or other material from the electrodes using a file.
  3. Place the foot switch in a location where accidental contact won't occur.
  4. Turn on the spot-welder and set the desired voltage using the dial on the front of the instrument. The voltage may be read using the meter on the front panel.
  5. Make sure contact between the electrodes and samples to be welded is good, since any air gaps between electrodes and sample will cause sparking.
  6. Press the foot switch to spot-weld the sample.
  7. In order to increase the voltage supplied to the electrodes, simply turn the dial on the front of the instrument clockwise.
  8. If a decrease in voltage is desired, first turn the dial on the front of the instrument fully counterclockwise. Next, press the foot switch. The voltage should now read zero. The voltage may be changed by adjusting the dial counterclockwise to the desired setting.
  9. Once the spot-welding procedure is complete, turn the dial fully counterclockwise and press the foot switch. Turn off the power to the spot-welder.

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