Northern Industrial Welding
11
Operating Instructions and Parts Manual
ST80i
A. Weld speed is too fast.
B. Weld speed is too slow.
C. Arc is too long.
D. Ideal weld.
A solid weld bead requires that the
electrode be moved slowly and
steadily along the weld seam. Moving
the electrode rapidly or erratically will
prevent proper fusion or create a
lumpy, uneven bead. To prevent
ELECTRIC SHOCK, do not perform
any welding while standing, kneeling,
or lying directly on the grounded work.
2.6 Finish the bead
As the coating on the outside of the
electrode burns off, it forms an
envelope of protective gasses around
the weld. This prevents air from
reaching the molten metal and
creating an undesirable chemical
reaction. The burning coating,
however, forms slag. The slag
formation appears as an
accumulation of dirty metal scale on
the finished weld. Slag should be
removed by striking the weld with a
chipping hammer.
PEENING THE SLAG FROM A
WELD JOINT CAUSES SMALL
CHIPS OF METAL TO FLY
THROUGH THE AIR
• Metallic chips flying through the
air can cause eye injury or injury to
other parts of the head, hands or
exposed portions of the body.
• Wear goggles or eye glasses with
side shields and protect the hands
and other exposed parts of the
body with protective garments, or
if possible, work with a shield
between the body and the work
piece.
The intense heat produced at the arc
sets up strains in the metal joined by
welding. Peening the weld not only
removes the scale left behind in the
welding but relieves the internal
strains developed by the heating and
cooling process. With the
hammer/brush after it is cooled.
Maintenance
The welder needs regular
maintenance as following:
Periodically clean dust, dirt, grease,
etc. from your welder. Every six
months, or as necessary, remove the
cover panel from the welder and air-
blow any dust and dirt that may have
accumulated inside the welder.
Replace power cord, ground cable,
ground clamp, or electrode assembly
when damaged or worn.
MINOR AND ROUTINE
MAINTENANCE
Store in a clean dry
facility free from corrosive gas,
excess dust and high humidity.
Temperature range from 10
°
F
–
120°F and the relative humidity not
more than 90%.
When transporting or storing the
welder after use, it is recommended
to repack the product as it was
received for protection. (Cleaning is
required before storage and you must
seal the plastic bag in the box for
storage
Summary of Contents for ST 80 i
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