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How to Test Welders

Part of keeping your welders running smoothly is to regularly test the diodes on the welding device. Regular testing of the diodes is a great way to run preventive maintenance on your welder and catch problems with the welder's power before they occur. Routine checks will enable you to locate parts within the welding machine that need to be repaired or replaced. If welding is your main source of income or your career choice, little is more important than making sure your equipment runs properly.

Things You'll Need

Screwdriver
Digital multimeter

Instructions

- 1
  Unplug your welding machine from its power source. If you attempt to test the welding machine while it is plugged into a power source you run the risk of receiving an electric shock.
- 2
  Use a screwdriver to take out the screws securing the welder case to the base of the welding machine. Pull off the cover.
- 3
  Look for the welding machine diodes attached to the inside wall. The diodes are roughly 6 inches in length and are tube-shaped.
- 4
  Turn the digital multimeter device on. Set the measurement dial on the multimeter to its specified resistance. To do this, look over the dial and locate the "omega" letter symbol. Set the dial to the letter.
- 5
  Take the black probe from the multimeter device and attach it to the negative port located on the device itself. Take the red probe and attach it to the positive port on the device.
- 6
  Take the opposite end of the probe and touch it to the negative lead of the diode you are testing. Take the opposite end of the red probe and put it against the positive lead of the diode. If the reading on your dial is not reading at zero or one, the diode is damaged and should be replaced immediately.

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