Resistance Welder MULTISPOT MI-90 T
Operation
34
Adjusting the contact force
NOTE
Be sure to set the correct contact force with
respect to the current welding, because:
– If the contact force of the electrodes is too high,
the electrical resistance will be too low which, in
turn, will affect the welding job.
– If the contact force is too low, the welding spots
may erode and leave holes in the sheets.
Fig. 34: Contact force
≤
1.8 kN
CAUTION
Danger to property.
When using the electrode arm configuration shown
to the left, 12-mm electrodes will slightly bend if the
contact force is set higher than 1.8 kN (405 lb f).
Therefore:
– Ask yourself, whether the job at hand could be
handled just as well with a different
configuration.
– When you have to use the configuration as
shown here, make sure the contact force does
not exceed 1.8 kN (405 lb f) / 6 bar (87 Psi).
Lifetimes of electrode caps
NOTE
The perfectly sound condition of the caps is
essential for good welding results.
Electrode caps must be milled (or replaced) after
50 welding jobs, especially when working with high
strength and/or galvanised steel (
see "6.1.2").
