THEORY OF OPERATION
MOTOMAN 3-9 Spot Welding Manual for Medar
The use of steppers can compensate for current density losses. By boosting the
current as caps “mushroom,” current density is maintained. In addition to the use
of steppers, tip dressing equipment can be used to machine electrodes. Resurfacing
makes them like new again.
Different sized caps cause the heat to be focused at a different point in the welding
process. This can be advantageous when welding metal stackups with different
part thicknesses. See Figure 3-9.
Figure 3-9 Welding Different Part Thicknesses
3.6.1 Steppers
Steppers are designed to increase current (deliver more heat), time (deliver longer
heat), or pressure (deliver lower tip-to-part resistance). Steppers are typically
programmed as a series of steps. During each stepper step, current will gradually
increase from the first weld to the last weld in that step. Figure 3-10 illustrates a
stepper program with five steps.
Figure 3-10 Stepper Program
To Next Page
Loading...
Need help?
General
