Welding Mild Steel; Mig Welding With Gas Protection; Mig Welding Without Gas Protection; Mig Welding Aluminium - WELDKAR WK MIG 2125 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. Connect
the terminal of the earth lead, inside the reel
compartment, to the negative pole.
- Mount the MIG torch supplied with the welding
machine on the fitting (1). Connect the power cable
leaving the torch, inside the reel compartment, to
the positive pole.
- 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 (3) and close the gas cylinder.
WK MIG 2125
Guidelines for settings
Thickness in mm Meters per minute Voltage
Steel SG-2 0,6mm
1,0mm
1,5mm
2,0mm
2,5mm
Steel SG-2 0,8mm
1,0mm
1,5mm
2,0mm
2,5mm
3,0mm
3,5mm
Steel SG-2 1,0mm
1,5mm
2,0mm
2,5mm
3,0mm
3,5mm
CuSi3 0,8mm
0,8mm
1,0mm
1,5mm
18
7,7m/min 14,5V
10,0m/min 17,5V
12,7m/min 18,9V
13,0m/min 21,0V
2,8m/min 14,5V
6,0m/min 17,0V
7,3m/min 18,0V
8,6m/min 18,8V
10.0m/min 19,5V
11,5m/min 22,0V
3,3m/min 16,2V
4,5m/min 16,4V
5,3m/min 18,0V
6,0m/min 18,5V
6,6m/min 19,2V
4,2m/min 13,3V
5,0m/min 13,4V
10,0m/min 14,8V
INVERTER WELDER WK MIG 2125
3.5.2 MIG WELDING WITHOUT
GAS PROTECTION
The actions to prepare the machine for welding are the
same as those described previously, but for this type of
welding proceed as follows:
- Mount a coil of flux-cored wire for welding without
gas.
- Mount the MIG torch supplied with the welding
machine on the fitting (1). Connect the power cable
leaving the torch, inside the reel compartment, to
the negative pole.
- Connect the grounding cable to the Negative output
terminal (2). Connect the terminal of the earth lead,
inside the reel compartment, to the positive pole.
- Select a program suited for flux-cored wire.
- Use only diam. 0.9 flux cored wire that complies
with the standard AWS AS.20 E71, suitable for use
without gaseous protection.
- Connect the terminal of the grounding cable to the
workpiece.
NOTE: For compact, well-protected welds always work
from left to right. (figure 4).

3.5.3 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.

3.5.4 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