5 Commissioning
5/3
•
Select latched mode with the key button (chap. 3, D1).
During the adjustment, the open-circuit voltage is applied to the torch electrode (when the
torch trigger has been pressed).
•
Press and release the torch trigger.
•
Slowly open the gas cylinder valve.
•
Set the required amount of shielding gas on the pressure reducer, about 4 - 15 l/min depending
on the current strength and the material.
Rule of thumb for gas flow rate:
Diameter of gas nozzle in mm corresponds to gas flow in l/min.
Example: 7 mm gas nozzle corresponds to 7 l/min gas flow.
5.6
General setting instructions
Set welding current:
•
The setting of the welding current depends first and foremost on the material, the thickness of
the metal to be welded and the seam preparation.
•
The welding current is corrected until such time as a perfect weld is guaranteed.
Other practical and theoretical descriptions of MMA and TIG welding can be found in the
MMA and TIG textbooks. These are available from us on request.
5.7 MMA
welding
Follow the safety instructions on the opening pages entitled "For your safety".
If welding is carried out alternately using TIG or MMA and if both a welding torch and an
electrode holder are connected to the machine, the open-circuit/welding voltage is applied
simultaneously to both.
The torch and the electrode holder should therefore always be placed on an insulated
surface before starting work and during breaks.
When replacing spent or new stick electrodes, always switch off the machine at the main
switch.
Always use insulated tongs to remove used stick electrodes or to move welded
workpieces. Always put the electrode holder down when insulated.
•
Connect workpiece lead and electrode holder.
The polarity depends on the type of electrode to be welded.
•
Fix workpiece lead with good electrical contact to the workpiece.
•
Insert mains plug into correctly earthed socket.
•
Set the welding process “MMA welding” using the key button. (chap. 3.1; C1)
•
Clamp stick electrode into electrode holder. Caution: Risk of injury from crushing!
•
Switch on machine at the main switch (G1
)
.
•
Set welding current.
•
Hold the protective screen in front of your face and, using the tip of the stick electrode, scrape
over the workpiece (as if you were striking a match).
The machine has a hotstart device.
During the ignition procedure the current is increased to improve ignition of the electrode.
•
As soon as the arc has ignited, try to maintain a distance from the workpiece equivalent to the
diameter of the stick electrode being used.
During welding, the distance should remain as constant as possible.
The stick electrode inclination should be 20 to 30°.
Arcforcing:
Shortly before the electrode threatens to stick, the arcforcing device sets an increased current
designed to prevent the electrode from sticking.
