EN-7
Ensure unit is powered off and unpluged
from the mains.
•
Chose the suitable wire liner to install. Mainly
there are 2 types of wire liners:
1.
Steel wire liners. These 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.
2.
Teflon/Graphite wire liners. These are sug-
gested for the welding of Aluminium, as they
allow a smooth feeding of the wire.
COLOR
BLUE
RED
YELLOW
DIAMETER Ø
0.6 - 0.9 1.0 - 1.2 1.2 - 1.6
Table 1
•
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. Verify that liner head reaches the
torch tip.
•
Connect the torch to the machine and install
the wire into the feeding system.
•
In case you are replacing a Teflon or graphite
Ensure unit is powered off and unpluged
from the mains.
WARNING: Cylinders are highly pressuri-
zed. Handle with care. Serious accidents
can result from improper handling or mi-
suse of compresses gas cylinders. Do not
drop the cylinder, knock it over, expose it
to excessive heat, flames or sparks. Do not
strike it against other cylinders.
The bottle (not supplied) should be located at the
rear of the welder, securely held in position by the
chain provided.
For safety, and economy, ensure that the regulator
is fully closed, (turned counter-clockwise) when not
welding and when fitting or removing the gas cylinder.
•
Turn the regulator adjustment knob counter-
clock wise to ensure the valve is fully closed.
•
Screw the gas regulator fully down on the gas
bottle valve, and fully tighten.
•
Connect the gas hose to the regulator secu-
ring with clip/nut provided.
•
Open the cylinder valve, then set the gas flow
on the regulator to approx. 5-15l/min.
•
Operate the torch trigger to ensure that the
gas is flowing through the torch.
GAS CYLINDER AND REGULATOR
CONNECTION
REPLACE WIRE LINER
wire liner, follow these instructions:
•
Install the new liner and insert the wire liner
collet (3) and the O ring (4).
•
Mount the brass nut (1).
•
At least 20cm of teflon liner have to come out
of the brass nut.
•
Remove the brass pin on the Euro connector
(keep it apart to use it with steel wire liners).
•
Tightly and carefully connect the torch to the
Euro connector.
•
Cut the wire liner 1mm from the wire feed
roll.
•
Install the welding wire into the feeding sy-
stem.
Warning: the length of the new wire liner
must be the same of the liner you have just
pulled out of the hose.
1
1
2
7
6
5
4 3 2
1
GRAFITE
1
graphite
steel
Figure 5 - Wire Liner Assembly
The machine will be set up as for mild steel except
for the following changes:
•
100% ARGON as welding protective gas.
•
Ensure that your torch is set up for aluminium
welding:
1.
The lenght of the torch should not exceed 3m
(it is advisable not to use longer torches).
2.
Install a teflon or graphite wire liner with cop-
per or brass terminal (follow the instructions
for the renewing of the wire liner at paragraph
REPLACING THE WIRE LINER).
3.
Ensure that drive rolls are suitable for alumi-
nium wire.
4.
Use contact tips that are suitable for alumi-
nium wire and make sure that the diameter
of the contact tip hole corresponds to the wire
diameter that is going to be used. To obtain a
high duty cycle without wire feeding problems
it is advisable to install the gas diffuser, the
contact tip with 8mm thread and the nozzle.
ALUMINUM WELDING
Summary of Contents for UNITECH 328
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