Thermal Arc C/W VFE 4C HS III, Руководство по эксплуатации

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c) Capacity of the wire feed unit and P ower Source,
d) The amount of penetration required,
e) The deposition rate required,
f) The bead profile desired,
g) The position of welding and
h) Cost of the electrode wire.
Weld metal deposition rate is proportional to current density. Current density is defined
as the current per cross sectional area of the electrode wire and is normally expressed
as amps per mm2. An example is tabled below.
Electrode Wire
Size
Current (Amps)
Current Density
(Amps/mm2)
Deposition Rate
(kg/hour)
0.9mm (.035”) 200 314 3.2
1.2mm (.045”) 200 177 2.8
The table above - 0.9mm (.035”) / 1.2mm (.045”) wire deposition rate
This demonstrates that where the upper limit of current is limited by machine capacity
and duty cycle, higher deposition rates and therefore greater productivity will be
achieved by using smaller electrode wire. The F
abricator i
s
a
particularly efficie
nt MIG
welder with 0.9mm steel wire in spray tranfer mode.
Higher current density (or smaller diameter wire) also gives deeper penetration as
shown Figure
2
5 .
0.9 mm (.035") 1.2mm (.045")
Figure 2 5 .
Penetration comparison using the same current (200A) for both electrodes Figure 2 5 -
Wire penetration comparison
8.06 Stitch Welding Operation
Stitch welding is normally used to bridge excessive gaps between panels or when
welding very thin material to prevent heat build up and distortion.
Please refer to section 7.06 for Stitch function control.
8.07 Spot Welding Operation
Fit a spot welding nozzle to the MIG Torch for consistent spot welding operations.
The F
abricator
will operate effectively using 0.8mm
welding
wire when
spot welding. Penetration depth is limited when using 0.6mm
welding
wire for
spot welding.
Please refer to section 7.06 for Spot welding control
.
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