Description Of Front Panel Controls; Front Panel; Basic Information Regarding Mig Welding; Connection And Preparation Of Equipment For Welding - CEMONT TF 300 Instruction De Securite D'emploi Et D'entretien

4.0 DESCRIPTION OF FRONT PANEL CON-
TROLS
4.1

FRONT PANEL

Picture 1.
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14
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16 17 10
1 - Welding system selector:
In position (2 stroke welding) press the torch button to
start welding, and release to stop.
In position (4 stroke welding) press the torch button to de-
liver gas; on release, wire feed and current are activated; press
again to stop wire feed and current and release to shut off the gas
supply.
In position (spot welding) the welder operates in timed
mode; press the torch button to start the welding phase, which
stops automatically after the time interval as set on the timer po-
tentiometer (Ref. 5 - Picture 1 Page 4.).
2 - Machine ON indicator lamp
3 - Machine overheating indicator lamp or defect on the water
cooling PCB.
4 - Wire feed speed control -potentiometer
5 - Spot welding time control potentiometer, from 0.3 to 10
seconds (operating only with selector (Ref. 1 - Picture 1 Page 4.)
set to position
6 - Wire feed motor acceleration time control potentiometer.
7 - Wire burn-off potentiometer. Time during which the welding
power is maintained after regular release of the torch button. In

DESCRIPTION OF FRONT PANEL CONTROLS

practice, at the end of welding, if this time is too short, the wire re-
mains stuck in the bath or protrudes too far from the torch contact
tube; otherwise, if the control time is too long, the wire remains
stuck in the torch contact tube, often causing damage to the latter.
8 - Advance wire button (without "current")
9 - Gas output test button
10 - Euro torch connector
14 - Voltmeter
15 - Ammeter
16 - Cooling water delivery connection (blue)
17 - Cooling water return connection (red)
5.0 BASIC INFORMATION REGARDING MIG

WELDING

MIG WELDING PRINCIPLES
MIG welding is autogenous, i.e. it permits welding of pieces made
of the same metal (mild steel, stainless steel, aluminium) by fu-
sion, while granting both physical and mechanical continuity. The
heat required for melting is generated by an electric arc that
strikes between the wire (electrode) and the piece to be welded.
A shield gas protects both the arc and the molten metal from the
atmosphere.
6.0 CONNECTION AND PREPARATION OF
EQUIPMENT FOR WELDING
CONNECT WELDING ACCESSORIES CAREFULLY TO AVOID
POWER LOSS OR LEAKAGE OF DANGEROUS GASES.
Carefully follow the safety standards
N.B. DO NOT ADJUST SWITCHES during welding operations to
avoid damage to the equipment.
CHECK THAT GAS IS DELIVERED FROM THE NOZZLE AND
ADJUST FLOW BY MEANS OF THE PRESSURE REDUCER
VALVE.
CAUTION: SCREEN GAS FLOW WHEN OPERATING IN OUT-
DOOR OR VENTILATED SITES; WELDING OPERATIONS
MAY NOT BE PROTECTED DUE TO DISPERSION OF INERT
SHIELDING GASES.
6.1 WELDING
1. Open the gas cylinder and regulate gas outlet flow as re-
quired. Fit the earth clamp on a part of the welding piece with-
out any paint, plastic or rust.
For optimal welding, keep the torch in the same direction as
the wire feed, as illustrated in figure.
2. Select the welding current by means of switches (Ref. 11 -
Picture 1 Page 4.); bear in mind that the greater the welding
thickness, the more power is required. The first switch setting
is suitable for minimum thickness welding.Also take into ac-
count that each setting features a specific wire drive speed
which can be selected by means of adjustment knob (Ref. 4
- Picture 1 Page 4.).
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