Ground Clamp Connection; Selecting The Proper Electrode - Matco Tools MP200DVILCD Owner's Manual

2. GROUND CLAMP CONNECTION

Clear any dirt, rust, scale, oil, or paint on the ground clamp. Make certain you have a good solid
ground connection. A poor connection at the ground clamp will waste power and heat. Make sure
the ground clamp touches the metal.
3. ELECTRODE
The welding electrode is a rod coated with a layer of flux. When welding, electrical current flows
between the electrode (rod) and the grounded metal work piece. The intense heat of the arc
between the rod and the grounded metal melts the electrode and the flux.

4. SELECTING THE PROPER ELECTRODE

There is no golden rule that determines the exact rod or heat setting required for every situation.
The type and thickness of metal and the position of the work piece determine the electrode type
and the amount of heat needed in the welding process. Heavier and thicker metals require more
amperage. It is best to practice your welds on scrap metals which match the metal you intend to
work with to determine correct heat setting and electrode choice. See the following helpful
trouble shooting tips to determine if you are using a correct electrode.
a. When the proper rod is used:
i. The bead will lay smoothly over the work without ragged edges.
ii. The base metal puddle will be as deep as the bead that rises above it.
iii. The welding operation will make a crackling sound similar to the sound of eggs
frying.
b. When a rod is too small is used:
i. The bead will be high and irregular.
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