HG soldatech EL120HG, User Manual, Page: 27 / 39

ENG
27
Extension cord
During normal use an extension cord is not necessary. It is strongly recom-
mended that an extension cord should not be used because of the voltage
drop they produce. This drop in voltage can affect the performance of the
welder. If you need to use an extension cord it must be a #12 gauge cord at
the smallest.
-Do not use an extension cord over 7.8m in length.
3. Setting up the work piece
Welding positions
There are two basic positions, for welding: Flat and Horizontal. Flat welding is
generally easier, faster, and allows for better penetration. If possible, the work
piece should be positioned so that the bead will run on a flat surface.
Preparing the Joint
Before welding, the surface of work piece needs to be free of dirt, rust, scale,
oil or paint. Or it will create brittle and porous weld. If the base metal pieces
to be joined are thick or heavy, it may be necessary to
bevel the edges with a metal grinder. The correct bevel should be around
60 degrees.
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.
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. The most popular electrodes are:
-E6011 60,000 PSI tensile strength deep penetrating applications.
-E6013 60,000 PSI tensile strength used for poor fit up applications
-E7014 70,000 PSI tensile strength used for high deposition and fast travel
speeds with light penetration
-E7018 70,000 PSI tensile strength, Used for out of position and tacking.