Northern Industrial Welder ARC 70
Operating Instructions and Parts Manual
7
correct bevel should be around 60
degree. See following picture:
Based on different welding position,
there are different welding joint, see
following images for more information
4. 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.
5. 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
-E7018AC 70,000 PSI tensile
strength, Used for out of position and
tacking.
6. Selecting the proper electrode
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
required more amperage. It is best to
practice your welds on scrap metal
which matches 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
1. When proper rod is used:
