CHAPTER 5: OPERATING INSTRUCTIONS
875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290
5-5
Electrode Face: Use a flat electrode face for most applications. Use a “domed” face if surface oxides
are a problem. If either of the work pieces is a wire, the diameter of the electrode face
should be equal to or greater than the diameter of the wire. If both work pieces are flat,
the face should be at least one-half the diameter of the electrodes.
Pencil point
electrodes reduce the overall quality of the welding process, and are not recommended.
Power Supply Parameters
You can develop weld schedules using Schedule 0, then copy it to any other schedule number.
Single Pulse Operation.
Select pulse width and % energy as follows:
x
Pulse Width:
Short
x
% Energy, Pulse 1:
10%
x
% Energy, Pulse 2:
0%
Dual Pulse Operation
.
Dual pulse operation can be helpful when welding plated materials,
materials with heavy oxidation, or small wires. For these applications start as follows:
x
Pulse Width:
Short
x
% Energy, Pulse 1:
5%
x
% Energy, Pulse 2:
15%.
NOTE:
Pulse 1 should be ½ to
̃
the energy of the Pulse 2.
Making a Weld
CAUTION:
Always observe safety precautions when welding. Wear your safety glasses.
1 Select [RUN] and [WELD] on the power supply.
2 Position the parts between the electrodes.
3 Press the footpedal or footswitch to initiate the power supply. Assuming no weld occurred, increase
%ENERGY in increments of 5% until the parts begin to weld. If you are using dual pulse operation,
increase Pulse 2 in increments of 5% and change the energy of Pulse 1 to maintain the ½ to
ѿ
ratio.