Instruction Manual
ITEM TE700
TECNA
S.p.A.
86/128
2.19
– TIP-DRESSINGS
The tip-dressing function is the combination, in just one function, of the current linear stepper
function coupled with the restoring of the electrodes original diameter.
The current stepper function allows compensating the electrodes wear which affects the
welding quality. When the electrodes diameter increases also the contact section between the
electrode and the piece to be welded increases. Consequently, the welding current density
(Ampere/mm
2
) decreases. In order to compensate this phenomenon, the current adjustment
is gradually increased according to the electrodes diameter increase so to keep a constant
current density.
The restoring of the electrodes original diameter is an operation which is usually carried out
by means of a tool (dresser) allowing restoring the electrodes diameter, which worn out and
increased during the production, to its initial working value.
If the same current adjustment is kept all along the electrodes life or if the electrodes diameter
is never restored to its optimal value, the last carried out welding spots will have a lower
quality than the first ones.
As a rule the electrodes dressing function is used in the presence of an automation that
provides an interface between the weld control unit and the dresser.
After it has been set, the current increment is applied to all the welding programs used.
4 different electrode dressing parameterizations are available and each parameterization is
associated with one of the four different welding tools available. In this way it is possible to
manage the use and dressing of 4 different types of electrodes separately, taking into
consideration, for the current increase, only the spots carried out by every single electrode.
This menu allows programming the tip-dressing number to be carried out during the
electrodes life.
TIP-DRESSING T1
>TOOLS N° 1
DRESSING OFF
DRESSING NUMBER 01
This function is displayed only if the (optional) expansion board, code 50200, is
installed on the control unit.
Before turning on the TE700 control unit with the supplementary
expansion board, code 50200, check that the CLEAR ELECTRODES LIFE
(Pin 52) input is not active.
Otherwise, the 50200 board is not recognized by the control unit.
The activation of this function inhibits the programming of the
STEPPER
menu
.
If the stepper
function is active, a message is displayed requesting the operator to confirm the deactivation
of the stepper function for the tool whose electrodes dressing activation is required. The
deactivation of the stepper function does not entail the loss of the parameterization set for the
stepper function.
