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l
Thickness of the metal to be welded.
l
Type of joint.
l
Capacity of the wire feed unit and power supply.
l
The amount of penetration required.
l
The deposition rate required.
l
The bead profile desired
l
The position of welding and 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 electrode wire and is normally expressed as amps per mm2. An example is tabled
below.
Electrode Wire Size
0.9mm (.035" )
1.2mm (.045" )
This demonstrates that where the upper limit of current is limited by the machine capacity and duty cycle,
higher deposition rates therefore greater productivity will be achieved by using smaller electrode wire. The
Inverter Mig series is a particularity efficient MIG welder with the 0.9mm~1.2mm steel wire in spray transfer
mode. 0.9mm wire cost approx. 10% more than 1.2mm but is deposited approx 15% faster.
High current density or smaller diameter wire also gives deeper penetration as shown:
5.06
Spot Welding Operation
Fit a spot welding nozzle to the MIG gun for consistent spot welding operations. The INVERTER MIG
Series power supply will operate effectively using 0.8~1.2mm electrode wire when spot welding. Penetration
depth is limited when using 0.6mm electrode wire for spot welding. Set the controls as follows for spot
welding:
1£® Coarse & fine voltage selector switches and wire speed control.
Select higher voltage selector switch positions and set the wire speed control between 354 to 590ipm
(9~15 meters/ minute)
2£® Mode selector switch.
3£® Spot Time.
4£® Burnback Time.
BOSS Inverter Mig 165¡¢ 200 Operating Manual
Current (A)
Current Density (A/mm
200
200
Table 8 0.9mm/ 1.2mm wire deposition rate
Figure 8 Wire penetration comparison
2
314
177
- 17 -
)
Deposition Rate (lbs/hour)
7.0
6.2
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