MX 3900 / MX 4900
Operation
17
5.1.3.4 Adjusting the distance between electrodes
Fig.11: Adjusting the distance between
electrodes
Make sure the distance between the electrodes is 6 to 8 mm.
Carry out the first welds, and then check the distance again.
Re-adjust, if necessary.
Use an Allen key SW5 as gauge in between the tips:
Electrode tip Allen key Electrode tip
Aligning electrodes
Fig.12: “Electrode must be in true align-
ment”
Be sure to look from different angles. Electrodes must align no
matter how you look.
5.2 Preparing the welding spot
The sheets must be ground to a bright metal finish at the contact position of the spot electrode
and the sheet. Do not damage galvanized surfaces. In case of layer insulation as e.g. with spot
welding primer, an electrical contact (shunt) is to be made first with a vise grip. The first spot
has to be positioned right next to it.
