Getting Ready For Mig/Mag Welding - Helvi 77611978 Mode D'emploi

8.0

GETTING READY FOR MIG/MAG WELDING

8.1 TORCH CONNECTION
• Plug the torch hose into the socket on the front of the welder
having care to not damage the contacts and secure by hand
screwing in the threaded connection.
8.2 WIRE LOADING
Ensure the gas and electrical supplies are disconnected.
Before proceeding, remove the nozzle and the contact
tip from the torch.
• Open the side panel.
• Loosen the nut (A) of the spool holder (position 1) (brake
drum). In the case you are replacing the wire spool, extract it
by pushing the snap tongue (D) (Fig 16). Remove the plastic
protection from the spool. Place it on the spool holder. Tighten
the lock nut (A) turning it to position 2. (Fig. 10).
The unit can also accept 100 mm diameter wire spools.
For the mounting follow these instructions:
• Remove the wire spool (B) from the spool holder (C).
• Loosen the nut (A), remove the spring and the washer; remove
the spool holder (C) from the pivot.
• Insert on the pivot the 100mm diameter wire spool; Mount the
washer and the spring.
• Tighten the lock nut (A).
Tighten nut (A) to appropriate tightness. Excessive pres-
sure strains the wire feeding motor. Too little pressure does not allow the immediate stop
of the wire spool at the end of the welding.
• Loosen and lower the plastic knob (A) (Fig.11). Open the pressure arm (B) of the feeder. Extract the
wire from the torch liner.
• When the wire is disconnected, grasp it with pliers so that it
cannot exit from the spool. If necessary, straighten it before
inserting it in the wire input guide (C). Insert the wire on the
lower roll (D) and in the torch liner.
WARNING: keep the torch straight. When feeding a
new wire through the liner, make sure the wire is cut
cleanly (no burrs or angles) and that at least 2 cm from
the end is straight (no curves). Failure to follow these
instructions could cause damage to the liner.
• Lower the pressure arm (B) and place the knob (A). Tighten
slightly. If tightened too much, the wire gets locked and could
cause motor damage. If not tighten enough, the rolls will not
feed the wire.
WARNING: When changing the wire diameter being used, or replacing the wire feed
roll, be sure that the correct groove for the wire diameter selected is inside, closest to
the machine. The wire is driven by the inside groove. Feed rolls are marked on the side
identifying the groove nearest that side.
• Close the side panel of the machine.
• Connect the power supply cable to the power output line. Turn on the switch. Press the torch switch.
The wire fed by the wire feeding motor at variable speed must slide through the liner. When it exits
from the torch neck, release the torch switch.
Note: after three seconds torch trigger is pressed wire feeding speed increases to allow
a fast exit of the wire on the torch neck.
• Turn off the machine.
• Mount the contact tip and the nozzle.
When checking the correct exit of the wire from the torch do not bring your face near the
torch, you may run the risk to be wounded by the outgoing wire. Do not bring your fin-
gers close to the feeding mechanism when working! The rolls, when moving, may crush
the fingers. Periodically, check the rolls. Replace them when they are worn and compro-
mise the regular feeding of the wire.
C
32
Figure 10
A
B
D
Figure 11