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MIG WELDING PRINCIPLES
MIG (Metal Inert Gas) welding allows you to fuse together two similar metals
without altering the properties of the metal.
A consumable wire electrode is continuously fed through the welding torch
that is fitted with a concentric gas nozzle. the wire is connected to a high
voltage supply which creates an electric arc between the electrode (the
wire) and the workpiece. The arc is used to create the required heat to turn
the metal into a molten state. The wire is used as both the electrode and as a
filler.
When using a gasless welder the shielding gas is created from the flux within
the welding wire.
When using the welder outside, you may need to erect a wind break.
OPERATING THE WELDER
PREPARING THE WORKPIECE
The area being welded should be perfectly clean. Any coating, plating or
corrosion must be removed, otherwise a good weld will be impossible to
achieve.
Attach the earth clamp to the workpiece as close to the point of weld as
possible, without it being intrusive.
OPERATION
1. With the welding current set and the wire trimmed, set the wire feed
control to 6.
2. Plug the machine into the mains supply and switch ON the machine.
3. Cover your face with a welding mask or welding helmet.
• This is essential.
4. Lower the torch to the workpiece with one hand and approach the work
with the torch tip at an angle of about 35
o
and pull the torch trigger fully.
• As the wire touches the workpiece, an arc will be struck.
CAUTION: TO PREVENT THE THERMAL OVERLOAD PROTECTION FROM
ACTIVATING, THE DUTY CYCLE MUST BE NOT BE EXCEEDED.
Содержание MIG102NG
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