CHAPTER 5: OPERATING INSTRUCTIONS
MODEL 250DP DUAL PULSE
RESISTANCE WELDING POWER SUPPLY
5-8
990-280
Electrode Maintenance
Depending on use, periodic tip resurfacing is required to remove oxides and welding debris from electrodes.
On the production line, you should use No.400-600 grit electrode polishing disks. For less critical
applications, you can use a file to clean a badly damaged tip. After filing, however, use polishing disks to
ensure that the electrode faces are smooth and parallel. If you don’t, the rough surface of the electrode face
will have a tendency to stick to the work piece; or, if the faces are not parallel, energy will be concentrated
at the point of contact and a blowout will result.
To dress the electrode tip:
1 Select [NO WELD].
2 On air actuated weld heads, reduce the air pressure to a value just sufficient to lower the upper electrode
arm.
3 Place the polishing disks between the electrodes and actuate the footpedal or footswitch to bring the
electrodes into light contact with the polishing disk. Move the polishing disk in a rotary motion.