Instruction manual
13
connected to this receptacle for both T.I.G. and coated
electrode welding.
B - Device for regulating the welding current
It gets connected to receptacle A
C - Procedure selector
You can select either the T.I.G. or the coated electrode
(SMAW) welding process.
D - ON/OFF light or Led for article 235
It remains lit while the machine is on.
E - Yellow led
It lights up when the thermostat trips.
The thermostat trips if the machine's rated duty cycle is
exceeded (see 2.2).
The machine shuts down until it cools down.
F - Manual/ Automatic Selector :
• Manual position : press the button and the
machine delivers current to the torch, when you
release the button, the current flow is cut off.
• Automatic position : push the torch button
once and release it and the machine supplies
current to the torch. To stop welding, press the button once
and release it and the current flow is cut off.
G - Digital Amperometer (optional) (exept item 235)
It indicates the welding current in Amperes.
NOTE: The welding current can be preset and displayed on
this instrument (see 4.1).
H - Red Shut Down Led.
When this led lights up, it means that the machine
automatically shuts down because the safety device which
reduces the risk of electric shock is not functioning. (exept
item 235)
I - Green Protection Led (exept item 235)
This led indicates that the device which reduces the risk of
electric shock is functioning normally and it should remain lit
while the machine is in operation. If it is not lit, there might
be a problem.
L - Post-Gas Regulation
This knob regulates the period of time in seconds that the
shielding gas will continue to flow after a welding operation
is terminated.The range runs from 0.3 to 30 sec.
M - High Frequency Arc Start Selector
In the coated-electrode(SMAW) mode it is automa-
tically excluded. When A.C. T.I.G. welding it must be
connected all of the time and when D.C. T.I.G.
welding it can be disconnected if you want to
"scratch start" the arc .
N - Main Power Switch
This switch turns the machine ON and OFF. (Note: The ON/
OF power switch on Article 235 is located on the back panel
of the machine.)
O - Up Slope Time Regulation
This knob regulates the time it takes the current to climb
from 0 to the amp value set by the amp potentiometer (Knob
B). The regulation range runs from 2.2 to 10 sec.
P - Gas Fitting (1/4 gas)
To connect the T.I.G. torch gas hose to the machine.
Q - Torch Control Receptacle
Insert the torch control plug in this receptacle.
It functions only when T.I.G. welding is selected.
R - Alternate Current (A.C.)-Direct Current (D.C.) Selector
• Select to A.C.: to weld aluminum, brass and magnesium
In T.I.G.
• Select to D.C.. to weld all other materials in TIG and to weld
coated electrdodes (SMAW).
S - Balance Control (exept item 235)
Using this knob, the semiperiods of the A.C.
square wave can be modified. This is especially
handy when you are TIG welding aluminium.
The point at which the two semi-waves are
balanced is the zero position. At the 0 position
less current is absorbed, the electrode is
consumed less, and there is an optimal ratio
between bead width and depth.
When you want to increase penetration, rotate knob S
clockwise towards the (+); viceversa, when you want to
increase cleaning action rotate knob S anticlockwise
towards (-).
This feature functions only when A.C. TIG welding is selected.
T - Regulation of the Current Down Slope Time
This knob regulates the time it takes the welding current to
pass from Amp value set by knob B to 0 at which point the
arc extinguishes. The regulation range runs from 0.2
seconds to 10 seconds and it is activated whenever the
command to stop the welding operation is given. The down
slope feature allows the crater at the end of weld seam to
be filled. This feature functions only when TIG welding is
selected.
4.1 PRESETTING OPERATING CURRENTS
4.1.1 Welding with electrode: Set selector (C)to then
regulate the current using knob (V).
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