Ground Clamp Connection; Selecting The Proper Amperage; Selecting The Electrode - Forney 235 Manuel D'utilisation

During the process of welding, workpieces will become very hot and tend to expand. This expansion
may cause the pieces to shift from the beginning position. If possible, workpieces should be clamped
into position required when the welding is completed.
WHEN GRINDING, ALWAYS WEAR GOGGLES AND ENSURE MACHINE GUARDS
ARE IN PLACE THE GRINDER MUST ALSO BE INSPECTED TO VERIFY IT IS IN
GOOD CONDITION.

Ground Clamp Connection

Be certain you have a solid ground connection. The ground clamp connection is part of the current
circuit. A poor connection at the ground clamp will result in wasted power and heat. Scrape away
any dirt, rust, scale, oil or paint you may find on the workpiece. Make sure the ground clamp directly
touches the metal surface.

Selecting the Proper Amperage

The electrode type and thickness of the metal work-piece determine the amount of heat needed in
the welding process. Heavier and thicker metals require more heat or amperage. Refer to a rod and
amperage guide or experiment on scrap metal. When you weld with proper rod, your results will be:
1. Bead will lay smoothly over the workpiece without ragged edges.
2. Base metal puddle will be as deep as the bead that rises above it.
When you weld with rod that is too small, your results will be:
1. Bead will be high and irregular.
2. Arc will be difficult to maintain.
When you weld with rod that is too large, your results will be:
1. Arc will burn through light metals.
2. Bead will undercut the work.
3. Bead will be flat and porous.
4. Rod may freeze or stick to the workpiece.
NOTE: The rate of travel over the workpiece affects the weld. To ensure proper penetration and enough
deposit of rod, move the arc slowly and evenly along the weld seam.

Selecting The Electrode

Forney provides a complete set of electrodes. Check with your local dealer for more information.
Welding electrode is a rod or wire of electrically conductive metal, coated with a layer of flux. When
welding, electrical current flows between the electrode or "rod" and the grounded metal workpiece. The
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