Draper MIG100GG, Инструкция по эксплуатации

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FIG.11
17
9. BASIC WELDING OPERATIONS
9.4 THERMAL CUT OUT – FIG.11
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.12
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 this welder the shield comes
from the flux cored welding wire that must be used.
The area to be welded 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. 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. 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. 12
†
Duty cycle:
The duty cycle is the percentage of 10 minutes that the machine can weld for at
a set amperage (10%=1min up to 100%=10mins). The higher the amperage, the lower the
welding time.