TECNA
S.p.A.
ITEM
TE700 Instruction
Manual
Now the operator replaces the electrodes (or restores their original diameter) and clears the
spots counter relevant to the tool whose electrodes were replaced to clear the stepper
calculations.
The TE700 resets the initial work parameters and begins a new stepper phase.
COMPLETE USE OF THE STEPPER FUNCTION (NON-LINEAR INCREMENT CURVE)
It is possible to use the non-linear increment curve function by knowing the real electrodes
consumption only.
In the aforesaid work method, a linear welding current increment is used during the whole life
span of the electrodes. In actual fact the increase of the contact section of the electrode on
the sheet is not linear but has a pattern that is similar to the one shown in the graph below.
IDEAL PATTERN
REAL PATTERN
WITH LINEAR INCREMENT
CU
R
R
E
NT
NUMBER OF WELDING SPOTS
As such the use of the linear increment is an approximation which nonetheless permits to
achieve good results in most applications. However when the operator wishes to achieve
utmost constancy during work conditions, a non-linear increment curve can be set that is
described by defining a certain number of segments.
This type of adjustment requires an adequate knowledge on how electrodes wear and on the
parameters required during their life. Consequently many welding spot tests are necessary for
assessing the work conditions in different moments of the electrodes' life.
IDEAL PATTERN
REAL PATTERN
WITH SET INCREMENT
CURVE
CU
RR
ENT
NUMBER OF WELDING SPOTS
The increment curve is set by assessing a certain number of linear segments. The number of
welding spots and the desired increment are assessed for each segment.
63/128
