Welding Mild Steel; Mig Welding With Gas Protection; Mig Welding Aluminium; Mig Welding Stainless Steel - WELDKAR WK MIG 3140 Mode D'emploi

3.5 WELDING MILD STEEL

3.5.1 MIG WELDING WITH GAS PROTECTION

Either 85% Argon + 15% CO² or 100% CO² may be
used for welding mild steel.
- Connect the grounding cable to the Negative
output terminal (2) and connect the terminal of the
grounding cable to the workpiece.
- Mount the MIG torch supplied with the welding
machine on the fitting (1).
- Select the welding current by means of the setting
knob (16).
- Move the torch near the welding point and press
the trigger. Adjust the potentiometer knob until the
welding is done with a constant, continuous noise.
Or see the table below for some settings.
- If the speed is too fast, the wire tends to stick to the
piece and cause the torch to skip; if the speed is too
low, the wire melts in spaced drops or the arc does
not remain lit.
- When you have finished welding, turn off the
machine (4) and close the gas cylinder.
NOTE: For compact, well-protected welds always work
from left to right. (figure 4).
WK MIG 3140
Guidelines for settings
Thickness in mm Meters per minute Voltage
Steel SG-2 0,8mm
1,0mm
1,5mm
2,0mm
2,5mm
3,0mm
3,5mm
4,0mm
5,0mm
6,0mm
Steel SG-2 1,0mm
1,5mm
2,0mm
2,5mm
3,0mm
3,5mm
4,0mm
5,0mm
6,0mm
7,0mm
INOX 0,8mm
2,0mm
2,5mm
3,0mm
4,0mm
5,0mm
18
4,2m/min 16,3V
5,5m/min 17,0V
6,8m/min 17,2V
8,2m/min 17,9V
10,0m/min 19,7V
11,6m/min 21,4V
13,0m/min 22,8V
14,0m/min 26,1V
15,0m/min 29,5V
3,4m/min 15,6V
4,4m/min 16,3V
5,5m/min 17,1V
6,4m/min 18,0V
7,4m/min 19,3V
9,0m/min 23,0V
10,0m/min 26,0V
12,0m/min 29,0V
12,8m/min 30,2V
9,2m/min 18,7V
10,6m/min 19,2V
11,8m/min 20,1V
15,1m/min 25,8V
18,1m/min 28,8V
INVERTER WELDER WK MIG 3140
INOX 1,0mm
2,0mm 5,1m/min
3,0mm 6,5m/min
4,0mm 7,4m/min
5,0mm 8,2m/min
6,0mm 8,6m/min
7,0mm 9,0m/min
8,0mm 10,0m/min

3.5.2 MIG WELDING ALUMINIUM

The welding machine must be prepared as for welding
mild steel with gas protection, but with the following
differences:
- 100% Argon as the protection gas for welding.
- A welding wire with a composition suitable for the
base material to be welded. Use wire feeder rollers
suitable for aluminum wire.
- Use wire feeder rollers specifically designed for
aluminium, and never use them on other materials.
REMEMBER that cleanliness is quality!
- The wire reels must be stored in plastic bags with
dehumidifying packets.
- For the correct welding angle see figure 4.

3.5.3 MIG WELDING STAINLESS STEEL

The welding machine must be prepared as for welding
mild steel with gas protection, but with the following
differences:
- Cylinder containing 98% ARGON + 2% 02
(recommended composition)
- Reel of stainless steel wire compatible with the
composition of the material to be welded.
- The recommended torch angle are shown in figure 4.
Figure 4
16,0V
17,6V
18,6V
20,5V
22,8V
25,2V
26,8V