8695 9007 / F
C - USE
MEC 4
C-11
4 - ADJUSTING THE ELECTRODE IN THE
MEC4
TORCH
The erosion of the tip of the electrode during welding is significantly determined by
the purity of its gas shield, and shielding is in principle ideal at a relatively small
distance from the orifice of the torch nozzle.
The greater the emerged length of the electrode (the arc length must be added to
that length), the greater the gas flow must be, and it can be disrupted by the flow of air
in the neighbouring area:
torch movement
movement of tooling in the vicinity
ventilation or aeration close to the welding equipment.
In practice, the tool supplied with the
MEC 4
torch should be adjusted so that the
electrode emerges out of the nozzle by 2 to 3 mm.
Once the tool is adjusted, electrode replacements can be made rapidly with no
adjustment, with the certainty of finding the same position.
Proceed as follows:
immobilise the electrode adjustment tool in a vice, for example
position the electrode in the electrode holder without tightening the clamp seat
too firmly, so that the electrode can still slide
insert the electrode holder in the tool by engaging the two flats fully, then
tighten the electrode holder with the 10mm spanner. The tip of the electrode
must then stop against the adjusting screw.
The length of the electrode that emerges out of the nozzle is obtained for the first
time by successively adjusting that screw immobilised by a lock nut.
26
Electrode adjustment tool
27
Adjustment
