Viking 210GM, 250GM
24
9.5 MIG Torch Maintenance
Remove dust and metallic particles from the torch conduit by forcing clean, dry compressed air
into the conduit once a week. This will minimise wire feeding problems.
10. BASIC WELDING TECHNIQUE
10.1 Setting of the Power Source
The setting of the Viking requires some practice by the operator, the welding Power Supply having
two control settings that have to balance. These are the Wirespeed control and the Voltage Control
switches. The welding current is determined by the Wirespeed control, the current will increase
with increased Wirespeed, resulting in a shorter arc. Less wire speed will reduce the current and
lengthen the arc. Increasing the welding voltage hardly alters the welding current level, but
lengthens the arc. By decreasing the voltage, a shorter arc is obtained with little change in welding
current.
When changing to a different electrode wire diameter, different control settings are required. A
thinner electrode wire needs more Wirespeed to achieve the same current level.
A satisfactory weld cannot be obtained if the wirespeed and voltage switch settings are not
adjusted to suit the electrode wire diameter and dimensions of the workpiece.
If the Wirespeed is too high for the welding voltage, “stubbing” will occur as the wire dips into the
molten pool and does not melt. Welding in these conditions normally produces a poor weld due to
lack of fusion. If, however, the welding voltage is too
high, large drops will form on the end of the electrode
wire, causing spatter. The correct setting of voltage and
Wirespeed can be seen in the shape of the weld deposit
and heard by a smooth regular arc sound.
10.2 Position of MIG Torch
The angle of MIG torch to the weld has an effect on
the width of the weld run. Refer to Figure 8.
10.3 Distance from the MIG Torch Nozzle to the
Work Piece
The electrode stick out from the MIG Torch nozzle
should be between 2.0mm (5/64”) to 5.0mm. (13/64”)
This distance may vary depending on the type of joint that is being welded.
10.4 Travel Speed
Speed at which a weld travels influences the width of the weld and penetration of the welding run.
10.5 Electrode Wire Size Selection
The choice of electrode wire size in conjunction with shielding gas used depends on:
a)
Thickness of the metal to be welded,
b)
Type of joint,
c)
Capacity of the wire feed unit and power 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.
Figure 8 - MIG Torch angle
Summary of Contents for Viking 210GM
Page 21: ...Viking 210GM 250GM 16 6 WELDING GUIDE VIKING 210GM...
Page 22: ...Viking 210GM 250GM 17 7 WELDING GUIDE VIKING 250GM...
Page 40: ...Viking 210GM 250GM 35 14 VIKING 210GM CIRCUIT DIAGRAM...
Page 41: ...Viking 210GM 250GM 36 15 VIKING 250GM CIRCUIT DIAGRAM...
Page 42: ...Viking 210GM 250GM 37 16 PRINTED CIRCUIT BOARD CIRCUIT DIAGRAM CAT NO 10 6100...
