90PUNTPI11 – 90PUNTPI12 – 90PUNTPI13 – 90PUNTPI21 – 90PUNTPI22 – 90PUNTPI23
- 18 -
2.4
DATA ON TRANSPORTING, STORAGE AND ASSEMBLY
Shipping:
Make sure that the means used to transport the welding machine is strong enough to withstand its weight. Pay attention
to the air connections and projecting parts to avoid any damage being done. The weights of the different models are given in the
technical data.
Unpacking – Assembly:
Remove the packaging from the welding machine with care, checking that all the accessories are inside
and that nothing has been damaged during shipping.
THE PEOPLE IN CHARGE OF LIFTING AND POSITIONING THE MACHINE MUST BE SUITABLY QUALIFIED.
3.
INSTRUCTIONS FOR THE OPERATOR
3.1
DESCRIPTION OF THE FUNCTIONS
To weld, the operator can either press the red button on the gun or use the lever switch on the studder gun. Squeeze time tests can
be run without welding by pressing the black push button on the top of the handle. When the welding control unit receives consent
to start the cycle it performs the welding sequence according to the parameters set on it. The sequence can be interrupted at any
time by releasing the cycle start push button.
If the start push button is released during weld time, the spot might not be
strong enough.
3.2
GUIDE TO STARTING THE WELDING MACHINE FOR THE FIRST TIME
a)
check there is compressed air
b)
check that the level of the coolant liquid is sufficient (see tab. below)
c)
power on via the main switch
d)
set the required electrode force by means of the pressure adjuster
e)
set welding parameters on the control unit (see next paragraph)
It is possible to use only (clean) water or water and glycol monopropylene with the following percentage:
Coolant liquid
Ambient temperature (
°C
) Glycole percentage (
%
)
0
-
-5
14
-10
23
-15
30
3.3
GETTING READY TO WELD
WELDING CYCLE:
The welding cycle consists of three basic times:
Squeeze time
:
it is the interval of time between the start of the cycle and the moment the electrodes, under the force exerted
on them, come into contact with the piece to be welded.
Weld time
:
this is the time during which the welding current passes through the electrode contact area.
Holding time
:
this is the time during which the force of the electrodes is maintained after weld time has finished.
The welding cycle can be divided in different times; for a more detailed explanation of this please read the paragraph relative to the
welding control unit.
3.4
INFLUENCE OF THE VARIOUS PARAMETERS ON THE WELDING RESULT
Force on the electrodes:
The greater the force is on the electrodes, the weaker contact resistance will be between the electrodes
and the sheets and the
less risk
there will be
of melted material being squirted.
However, the force on the electrodes is limited
by the welding machine’s capacity. The greater the force is on the electrodes, the greater the current value will be to achieve
welding.
Weld time :
Welding can be achieved with different weld times:
Short weld time
:
it effects a small area of material being heated but the welding machine’s performance
(less than 200ms)
is superior.
Long weld time
: (400-1000ms)
it leaves a heavy electrode mark on the sheets and utilises the machine to the utmost
Medium weld time
: (200-400ms)
a good compromise between the two extremes
