General Notes; Welding Mild Steel - ATD 37155 Manuel D'instructions

N° Serial number which must be stated when
asking for information or servicing related to
this machine.
IEC 60974-1 The welding machine is manufactured according
EN 50199 to these international standards.
Single-phase Transformer - Rectifier
MIG/MAG. Suitable for continuous wire welding
I2 max Unconventional welding current.
The value represents the maximum level that
can be obtained in welding.
Uo Secondary no-load voltage.
X The duty-cycle expresses the percentage of
10 minutes during which the welding machine
can operate at a determined current level
without overheating: e.g. X=60% at I2=100 A.
This means that the welding machine can
weld with a current I2 = 100A for 6 minutes out
of 10, i.e. 60%.
I2 Welding current
U2 Secondary voltage with welding current I
U1 Nominal supply voltage at the rated frequency.
I1 max. This is the maximum value of the absorbed
current.
I1 eff. This is the maximum value of the actual absor-
bed current.
Ip 21 Grade of protection of the case.
Grade 1 as a second number means that this
unit is not fit for working in the rain.
S Fit for working in high-risk areas.
3.3 DESCRIPTION OF PROTECTION
This device is protected by a normally closed thermostat
on the power transformer.
When the thermostat is tripped the machine stops weld-
ing, while the motor-driven fan continues to run and the
yellow LED lights.
After it has been tripped, wait a few minutes to allow the
generator to cool down.
4 INSTALLATION
The machine must be installed by skilled personnel. All
connections must be made in compliance with current reg-
ulations and in full respect of safety laws.
Make sure that the wire diameter corresponds to the one
indicated on the roller, and mount the wire reel. Make sure
that the welding wire passes through the groove in the
small roller 7.
Before connecting the power cable 23, make sure that the
power voltage corresponds to that of the welding machine,
then: a) for permanent connection to the power mains
without a plug, you must insert a main switch
having a suitable capacity in compliance with the
rated specifications.
b) for a plug-socket connection, use a plug having
a suitable capacity in compliance with the rated
specifications. In this case the plug must be used
to completely disconnect the machine from the
mains, after setting the switch 47 to "O" (off).
The yellow-green wire must be connected to the earth ter-
minal. Connect the earth clamp 37 to the part to be welded.
The welding circuit must not be deliberately placed in
direct or indirect contact with the protection wire except in
the workpiece.
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If the workpiece is deliberately grounded using the protec-
tion wire, the connection must be as direct as possible,
using a wire at least as large as the welding current return
wire, and connected to the workpiece at the same point as
the return wire, using the return wire clamp or a second
grounding clamp placed next to it.
All precautions must be taken to avoid stray welding cur-
rents.
Turn the machine on using the switch 47.
Remove the tapered gas tip 44 by turning it clockwise.
Unscrew the contact tip 43.
Do not press the torch trigger until you have read the
instructions carefully.
It is important to make sure the machine is turned off
whenever changing the wire reel and wire roller, to prevent
the wire feed motor from starting accidentally.
Press the torch trigger 39 and release it only when the
welding wire comes out.
Welding wire can cause puncture wounds.
Never aim the torch at parts of the body, other people or
metals when loading the welding wire.
Screw the contact tip 43 back on, making sure that the
hole diameter corresponds to the wire used.
Slide the tapered gas welding tip 44 on, always turning
clockwise.
4.1 CONNECTING THE GAS HOSE
The gas cylinder must be equipped with a pressure
l
reducer and flow meter.
If the cylinder is placed on the cylinder holder of the
l
machine, it must be held in place by the chain provided
and be of an appropriate size to avoid jeopardizing the
stability of the machine.
Connect the gas hose leaving the back of the machine
l
to the pressure reducer only after the cylinder is in place.
Open the gas cylinder and set the flow meter to approx-
l
imately 8-10 lt./min.
CAUTION: Make sure the gas used is compatible with the
material to be welded.

4.2 GENERAL NOTES

Before using this welding machine, carefully read the reg-
ulations CEI 26/9 or CENELEC HD 407 and CEI 26/11 or
CENELEC HD 433. Also make sure that the insulation on
cables, torch and earth cable is intact.
5 WELDING
5.1

WELDING MILD STEEL

5.1.1 With gas protection.
Either 75% ARGON + 25% CO2 or 100% CO2 may be
used for welding mild steel.
Connect the cables as shown in the figure 3.
Select the welding current by means of the rotary switchl
47.
Move the torch near the welding point and press the trig-
ger 39.
Adjust the potentiometerl knob 2 until the welding is done
with a constant, continuous noise.
If the speed is too fast, the wire tends to stick to the piece
and cause the torch to skip; if the speed is too low, the
wire melts in spaced drops or the arc does not remain lit.
3