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3.5.4 MIG WELDING STAINLESS STEEL
The welding machine must be prepared as for welding
mild steel with gas protection, but with the following
differences:
-
Cylinder containing 98% ARGON + 2% 02
(recommended composition)
-
Reel of stainless steel wire compatible with the
composition of the material to be welded.
-
The recommended torch angle are shown in figure 5.
3.6 MMA WELDING
-
This welding machine is suitable for welding all
types of electrodes, with the exception of cellulosic.
-
Make sure that the switch (6) is in position 0, then
connect the welding cables, matching the polarity
required by the manufacturer of the electrodes you
will be using.
VERY IMPORTANT:
Connect the terminal of the grounding cable to the
workpiece, making sure that contact is good to ensure
smooth equipment operation and avoid voltage dips with
the workpiece.
-
Connect the grounding cable to the Negative output
terminal (2).
-
Connect the Electrode Holder lead to the Positive
output terminal (4).
-
Make sure that the supply voltage matches the
voltage of the welding machine.
-
Do not touch the torch or electrode clamp
simultaneously with the mass terminal.
-
Turn the machine on using the switch (6).
-
Set the Process Selection Switch (10) to MMA.
-
Adjust the welding current using the knob (22).
Always remember to shut off the machine and
remove the electrode from the clamp after
welding.
3.7 TIG WELDING
-
This welding machine is suitable for welding the
following materials using the TIG procedure (scratch
start): stainless steel, iron, copper.
-
Make sure that the supply voltage matches the
voltage of the welding machine.
-
Do not touch the torch simultaneously with the mass
terminal.
-
Connect the TIG welding torch to the Negative
output terminal (2).
-
Connect the TIG torch trigger switch to the
connector (3).
-
Connect the gas hose from the TIG torch to the gas
outlet (5) on the front of the power source.
-
Connect the mass cable connector to the Positive
output terminal (4) of the welding machine, and the
clamp to the workpiece as close as possible to the
welding point.
-
Fit the welding grade shielding gas regulator/
flowmeter to the shielding gas cylinder then connect
the shielding gas hose from the regulator/flowmeter
outlet gas inlet (7) on the rear of the power source.
-
Turn the machine on using the power switch (6).
-
Set the Process Selection Switch (10) to TIG.
-
Press the torch trigger and set the gas flow.
-
Use a tungsten electrode suitable for welding
iron and stainless steel, f.e. a 2% cerium-covered
tungsten electrode, with a diameter of Ø 2,4 mm
(3/32").
-
Press the selection button (23) to choose 2T or 4T
mode:
• TIG 2T; In this mode, the torch trigger must
remain depressed.
• TIG 4T; This mode of welding is mainly used for
long welding runs to reduce operator fatigue. In
this mode the operator can press and release
the torch trigger and the output will remain
active. To shut off the arc, the trigger switch
must again be depressed and released, thus
eliminating the need for the operator to hold the
torch trigger.
-
Adjust the welding current using the knob (22).
-
Digital Ammeter (11); The digital display is used to
display both the pre-set current and actual output
current of the power source.
-
Adjust the Down Slope (21). This parameter
operates in TIG modes only and is used to set the
time for the weld current to ramp down, after the
torch trigger switch has been pressed. This control
is used to eliminate the crater that can form at the
completion of a weld.
-
Adjust the Pre Flow (28). This parameter operates
in TIG modes only and is used to provide gas to the
weld zone prior to striking the arc, once the torch
trigger switch has been pressed. This control is used
to dramatically reduce weld porosity at the start of a
weld.
-
Adjust the Post Flow (29). This parameter operates
in TIG modes only and is used to adjust the post
gas flow time once the arc has extinguished. This
control is used to dramatically reduce oxidation of
the tungsten electrode.
Remember to shut off the machine and close
the gas cylinder valve when you have finished
welding.
4. MAINTENANCE
ANY MAINTENANCE OPERATION MUST BE
CARRIED OUT BY QUALIFIED PERSONNEL.
4.1 MAINTENANCE OF THE WELDING
INVERTER
In the case of maintenance inside the machine, make
sure that the switch (6) is in position "0" and that
the power cord is disconnected from the mains. It is
also necessary to periodically clean the interior of
the machine from the accumulated metal dust, using
compressed air.
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