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ITEM 338672.S1 PNEUMATIC GUN (see page 16)
A - ELECTRODES
B - ARMS
C - ARMS LOCKING SCREW
D - SPEED ADJUSTMENT
E - TRIGGER
E1 - REST
E2 - PRESSURE ONLY
E3 - WELDING
F - LOCKING SCREWS FOR CABLES
G - CONTROL CABLE
H - CONNECTOR
L - AIR HOSE
M - WELDING CABLES
N - STROKE ADJUSTMENT
O - ADDITIONAL HANDLE
P - COUPLING LARGE GAP ARMS
PNEUMATIC GUN - ADJUSTMENT SMARTGUN
The gun 338672.S1 has a patented, very important, and innovative feature: that is to say, an easy-to-use trigger (E) with
double stroke. In the first part of its stroke (E2), the electrodes exert a clamping force only, thus allowing a gradual closing
or the re-opening of the arms. The trigger at the end of its stroke carries out the welding, only if the clamping force is the
correct one. This is due to a differential pressure switch that automatically adjusts the start of welding in the range from 3
to 8 bars.
WORK
Connect to the welder the equipment with both arms and electrodes necessary for the work to carry out.
Adjust the welding parameters on the basis of both personal experience, table n° 2 at page 12, and welding examples
(page 15 of this manual).
Moreover, before starting the welding process, check the welding conditions (time, current, force, electrode "ø",
etc.). Use two off-cuts of the sheet to weld, carry out two spots at the same distance used during the production, then
remove the first and check the second: the spot is correct when the pulling test causes the coming out of the weld
nugget with the hole of a sheet, and the twist test shows a pure area without porosity or causes the coming out
of the nugget.
During the working it is advisable to monitor those parameters which can alter the working conditions and thus the
welds quality. If you are operating spot welding, always monitor the electrodes that must always be clean, without any
deformation and must have the proper diameter according to the work to be carried out. When using a pneumatic gun,
check that there are not strong changes in the welder supply pressure as they could modify the force on the electrodes
and thus the welding quality.
To facilitate the electrode removal and to prevent from cone seizure, use high conductivity grease similar to the standard
one.
Electrodes must not be used to force the clamping of the pieces to weld.
ORDINARY MAINTENANCE
This chapter states the necessary maintenance operations to be carried out for:
1) Keeping the welding unit operating safety and preserving its efficiency;
2) Avoiding the most common causes of wrong working worsening the welding quality.
TRACTION - X = SAME DISTANCE OF SPOTS IN PRODUCTION
9
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