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INVERTER WELDER WK MIG 2125

3.5 WELDING MILD STEEL 3.5.2 MIG WELDING WITHOUT
GAS PROTECTION
3.5.1 MIG WELDING WITH GAS PROTECTION
The actions to prepare the machine for welding are the
Either 85% Argon + 15% CO² or 100% CO² may be same as those described previously, but for this type of
used for welding mild steel. welding proceed as follows:
- Connect the grounding cable to the Negative - Mount a coil of flux-cored wire for welding without
output terminal (2) and connect the terminal of gas.
the grounding cable to the workpiece. Connect - Mount the MIG torch supplied with the welding
the terminal of the earth lead, inside the reel machine on the fitting (1). Connect the power cable
compartment, to the negative pole. leaving the torch, inside the reel compartment, to
- Mount the MIG torch supplied with the welding the negative pole.
machine on the fitting (1). Connect the power cable - Connect the grounding cable to the Negative output
leaving the torch, inside the reel compartment, to terminal (2). Connect the terminal of the earth lead,
the positive pole. inside the reel compartment, to the positive pole.
- Select the welding current by means of the setting - Select a program suited for flux-cored wire.
knob (16). - Use only diam. 0.9 flux cored wire that complies
- Move the torch near the welding point and press with the standard AWS AS.20 E71, suitable for use
the trigger. Adjust the potentiometer knob until the without gaseous protection.
welding is done with a constant, continuous noise. - Connect the terminal of the grounding cable to the
Or see the table below for some settings. workpiece.
- 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 NOTE: For compact, well-protected welds always work
low, the wire melts in spaced drops or the arc does from left to right. (figure 4).
not remain lit.
- When you have finished welding, turn off the
machine (3) and close the gas cylinder. 3.5.3 MIG WELDING ALUMINIUM
The welding machine must be prepared as for welding
WK MIG 2125 mild steel with gas protection, but with the following
Guidelines for settings differences:
- 100% Argon as the protection gas for welding.
Thickness in mm Meters per minute Voltage - A welding wire with a composition suitable for the
base material to be welded. Use wire feeder rollers
Steel SG-2 0,6mm suitable for aluminum wire.
1,0mm 7,7m/min 14,5V - Use wire feeder rollers specifically designed for
1,5mm 10,0m/min 17,5V aluminium, and never use them on other materials.
2,0mm 12,7m/min 18,9V REMEMBER that cleanliness is quality!
2,5mm 13,0m/min 21,0V - The wire reels must be stored in plastic bags with
dehumidifying packets.
Steel SG-2 0,8mm - For the correct welding angle see figure 4.
1,0mm 2,8m/min 14,5V
1,5mm 6,0m/min 17,0V
2,0mm 7,3m/min 18,0V 3.5.4 MIG WELDING STAINLESS STEEL
2,5mm 8,6m/min 18,8V
3,0mm 10.0m/min 19,5V The welding machine must be prepared as for welding
3,5mm 11,5m/min 22,0V mild steel with gas protection, but with the following
differences:
Steel SG-2 1,0mm - Cylinder containing 98% ARGON + 2% 02
1,5mm 3,3m/min 16,2V (recommended composition)
2,0mm 4,5m/min 16,4V - Reel of stainless steel wire compatible with the
2,5mm 5,3m/min 18,0V composition of the material to be welded.
3,0mm 6,0m/min 18,5V - The recommended torch angle are shown in figure 4.
3,5mm 6,6m/min 19,2V
CuSi3 0,8mm
0,8mm 4,2m/min 13,3V Figure 4
1,0mm 5,0m/min 13,4V
1,5mm 10,0m/min 14,8V

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