Helvi TP 195, Operating Manual

Page: 10 / 20

• 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 gui-
de (C). Insert the wire on the lower roll (D) and in
the torch liner.
WARNING: keep the torch straight. When fee-
ding 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 mar-
ked 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 fingers 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 compromise the regular feeding of the wire.
7.1.3 REPLACING THE WIRE LINER
Ensure the gas and electrical supplies are disconnected.
• Disconnect the torch from the machine.
• Place it on a flat surface and carefully remove the brass nut (1).
• Pull the liner out of the hose.
• Install the new liner and mount the brass nut (1) again.
In case you are replacing a Teflon wire liner, follow these instructions:
• Install the new liner followed by the collet (3).
• Insert the O ring (4) on the wire liner collet (4)and replace the
brass nut (1).
• Cut the wire liner close to the brass nut
Warning: the length of the new wire liner must be
the same of the liner you have just pulled out of
the hose.
• Connect the torch to the machine and install the wire into the
feeding system.
7.1.4 HOW TO CHOOSE THE WIRE LINER
Mainly we can have 2 types of wire liners: Steel wire liners and Teflon wire liners.
• The steel wire liners can be coated or not coated: the coated wire liners are used for air cooled torches;
the wire liners which are not coated are used for water cooled torches.
• The Teflon wire liners are suggested for the welding of Aluminium, as they allow a smooth feeding
of the wire.
A
B
C
D
E
Figure 6
Colour BLUE RED YELLOW
Diameter Ø 0,6-0,9 Ø 1,0-1,2 Ø 1,2-1,6
Figure 7
10