Resistance Welder MULTISPOT MI-100-3
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 weak
which, in turn, will affect the welding job.
−
If the contact force is too weak, the welding spots may erode and leave holes in the sheets.
Fig.37: 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).
Distances between welding spots
Fig.38: “Distances should not be too
short.”
Don’t keep the distances between welding spots too short
(25 mm approx.). Otherwise, the weld current might affect the
spots (that have already been applied) a second time.
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 "0").
