Technical Data Information Guide; Welding Preparation; Mig (Gmaw) Welding Using Shielding Gas; Factors To Consider For Best Welding Results - Forney 242 MIG Manuel D'utilisation

Technical Data Information Guide

Refer to the back of the welder for specifications.

Welding Preparation

• Connect the ground cable to the proper female outlet on the bottom right-hand corner of the
welder (on some models the ground cable is already connected). Attach the ground clamp to
the bare metal to be welded, making sure of good contact;
• Make sure that the wire-roller groove in the roller corresponds to the diameter of the wire
being used.
• Plug the machine into a suitable outlet.
• Open the gas valve on the gas cylinder regulator, (turn knob clockwise) and adjust the gas
regulator to the proper setting position. Note: this varies with different metals, thicknesses
and currents.

MIG (GMAW) Welding Using Shielding Gas

In MIG welding, two parameters are fundamental: (1) the welding voltage and (2) the wire speed. The
welding current is determined by these two settings. Set the voltage and wire speed controls to positions
suitable for the thickness of the material to be welded. Adjust the wire speed to fine tune the welding
current.

Factors to Consider for Best Welding Results

1. Material to be welded. (Mild steel, Stainless Steel, Aluminum)
2. Thickness of material to be welded.
3. Diameter of the welding wire.
4. Type of shielding gas used.
Using the Mode button, select the tigger mode.
• 2T - The welding process starts when the torch trigger is pressed and stops when the trigger
is released.
• 4T - The welding process starts when the trigger is pressed and released. Welding continues
until the trigger is pressed and released a seocond time. This mode is best for very long
welds or for some automative welding.
• Spot welding with timer - Automatic spot welder with timer. This process permits repeated
spot welds each time the trigger is pressed. The duration of the spot weld is controlled by
Knob (5). A spot welding nozzle is recommended.

Aluminum Welding Set Up

The welder should be set up as for mild steel except for the following: Use 100% Argon for the shielding
gas. Ensure the Spool Gun is set up for aluminum welding with a teflon liner and does not exceed 10'
in length. Ensure the contact tip and drive rolls are suitable for aluminum wire. For aluminum welding,
or for welding other material that requires the use of soft wire, and for applications where a longer
torch cable is required, a Spool Gun is recommended.
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