16
9. OPERATING INSTRUCTIONS
FIG. 10
9.4 THERMAL CUT-OUT (FIG.9)
If the duty cycle of the welder is exceeded, the
thermal cut out will activate to prevent damage to
the internal components or further overheating.
When the thermal cut-out warning light is lit, the
welder must be left to cool down before it can be
restarted.
9.5 MIG WELDING PRINCIPLES (FIG.10)
The Mig welding process allows two similar
materials to be fused together without altering the
properties of the material. The electric arc created
between the electrode (the welding wire) and the
work piece produces the required heat for turning
the metal into a molten state. The gas creates a shield
around the arc and the molten metal, on a no gas
welder the shield gas comes from the flux cored
welding wire that must be used. The shield gas
required will either be CO² or Argon of a CO²/Argon
mix. The choice of gas is dependent upon the material
to be welded.
When operating outdoors measures to create a
wind break may be necessary as a break down of
the shield gas may occur resulting in a poor weld.
The area to be welding and the earth point must be
clean of grease, dirt, paint and rust. Clean with a
wire brush as necessary. Position the earth clamp
as close as possible to the working area and ensure
a tight grip is achieved.
Select the welding current based on the thickness
of the material. A thick piece will require a high
current, however due to the duty cycle this will
effect the welding time by significantly reducing it. A
thin piece will only require minimal heat and so the
current can be less. This will allow a longer period
of welding. Ensure the gas (where applicable) flow
is set on the regulator accordingly. The position of
the torch is critical to the arc and end results.
The position of the welding torch is important to
achieve a good quality bead. Position the torch at
approximately 35 vertically and 75 horizontally and
up to 20mm* distance from the join. 20mm is the
maximum that can be achieved on the maximum
setting. Ensure the gas shroud remains clean of
spatter as a build up will start to reduce the
flow/effects of the shield gas. Likewise and more
importantly the wire feed tip must be kept clean to
avoid the wire becoming blocked or restricted.
Use of an anti-spatter spray (Draper Stock
No.05709) will help keep the end result more tidy.
35°
75°
FIG. 9
Summary of Contents for 71091
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