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5.01
Basic MIG Welding Guide
The welding power supply has two control settings that have to balance. These are the wire speed
control and the voltage control switches. The welding current is determined by the wire speed control, the
current will increase with increased wire speed, resulting in a shorter arc. Less wire speed will reduce the
current and lengthen the arc. By decreasing the voltage, a shorter arc is obtained with little change in welding
current, because the wire speed is not changed.
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When changing to a different electrode wire diameter, different control settings are required. A thinner
electrode wire needs more wire speed to achieve the same current level.
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A satisfactory weld cannot be obtained if the wire speed and voltage switch settings are not adjusted to
suit the electrode wire diameter and dimensions of the work piece.
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If the wire speed is too high for the welding voltage, " stubbing" will occur as the wire dips into the molten
pool. If the wire speed is too slow for the welding voltage, large drops will form on the end of the
electrode wire, causing spatter. Suppose that wire speed is constant, if the welding voltage is too high,
large drops will form on the end of the electrode wire, causing spatter; if the voltage is too low, the wire
will not melt.
5.02
Position of MIG Gun
The angle of MIG gun to the weld has an effect on the width of the weld run.
5.03
Distance from the MIG Gun Nozzle to the Work Piece
The electrode stick out from the MIG gun nozzle should be between 2.0mm to 5.0mm. This distance may
vary depending on the type of joint that is being weld.
5.04
Travel Speed
Speed at which a weld travels influences the width of the weld and penetration of the welding run.
5.05
Electrode Wire Size Selection
The choice of electrode wire size in conjunction with shielding gas used depends on:
BOSS Inverter Mig 165¡¢ 200 Operating Manual
Figure 7 MIG gun angle
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