CHAPTER 5: OPERATING INSTRUCTIONS
MODEL 250DP DUAL PULSE
RESISTANCE WELDING POWER SUPPLY
5-4
990-280
250DP 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 250DP.
2 Position the parts between the electrodes.
3 Press the footpedal or footswitch to initiate the 250DP. 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.
Evaluating the Weld
Use pliers to peel the welded materials apart. A satisfactory weld will show residual material pulled from
one material to the other. Tearing of base material around the weld nugget indicates a material failure, not a
weld failure. Electrode sticking and/or "spitting" should define a weld as unsatisfactory.
