9
Electricity
The electricity flows through the electrode cable to the attached electrode. The
electricity will not leave the electrode unless it touches an earthed object.
Electricity always finds the fastest path to the earth. When the earth cable clamp is
connected to the metal work piece a direct earth connection is created back to the
welder. When the electrode makes contact with the earthed work piece an arc is
created. The electricity flows through the electrode, the metal work piece and then
through the earth cable straight back to the welder.
Setting the Welding Current
The welding current must be regulated in accordance with the diameter of the
electrode and the thickness of the metal being used. Below is a table suggesting
suitable ratios.
On the front of the welder is the current regulating knob. Rotate this knob clockwise to
increase, and anti clockwise to decrease the current supplied. Observe the gauge on
top of the welder for the current setting.
Prior to performing any welding the surfaces to be welded may need to be cleaned of
dust, rust, grease, paint and also slags from previous welding work performed.
Starting to weld
BEFORE WELDING ENSURE THAT:
You have read the safety section of this manual.
All oil. Petrol and flammable containers have been removed from the area.
There is good all round ventilation. Particularly at the front and rear of the unit.
You have an adequate fire-fighting appliance on hand.
Welding Procedure
1. Attach the earth clamp to the work piece as previously described.
2. Insert an electrode into the electrode holder (5) as previously described.
3. Connect the arc welder power cord to a live mains outlet.
4. Turn the welder on by depressing the on/off switch (3) to the “On” position.
5. Adjust the welding current (4) to suit the diameter of the electrode and also the
thickness of the metal being welded.
Electrode Diameter
Welding Current Amps)
Thickness of Metal
2mm
55 - 75
1.5 - 2mm
2.5mm
80 - 105
3 - 5mm
3.2mm
105 - 130
4 - 6mm
OPERATION (cont.)
