Lincoln Electric POWER ARC 5000 - Manual (Page 27)

B-11 OPERATION B-11
POWER ARC 5000
The Power-Arc provides excellent weld output charac-
teristics when used in combination with Lincoln AC
electrodes. Other AC electrodes may also be used.
Follow the settings listed in Table B.4 “Welding
Applications/Electrode Selection Guide” found on the
nameplate of the machine.
ARC RAYS can burn.
• When using an open arc process,
it is necessary to use correct eye,
head and body protection.
WARNING
P O W E R A R C 5 0 0 0
Arc Welding power
source and controls
Electrode Holder
Electrode
Arc
Work Clamp
Work Cable Electrode Cable
Work Work
Stick Welding
Learning To Stick Weld
The serviceability of a product or structure utilizing this
type of information is and must be the sole responsi-
bility of the builder/user. Many variables beyond the
control of The Lincoln Electric Company affect the
results obtained in applying this type of information.
These variables include, but are not limited to, welding
procedure, plate chemistry and temperature, weld-
ment design, fabrication methods and service require-
ments.
No one can learn to weld simply by reading about it.
Skill comes only with practice. The following pages
will help the inexperienced welder understand welding
and develop his skill. For more detailed information,
order a copy of the book “New Lessons in Arc
Welding.” (See Book Division section at rear of manual).
The operator’s knowledge of arc welding must go
beyond the arc itself. He must know how to control the
arc, and this requires a knowledge of the welding cir-
cuit and the equipment that provides the electric cur-
rent used in the arc. Figure B.3 is a diagram of the
welding circuit. The circuit begins where the electrode
cable is attached to the welding machine and ends
where the work cable cable is attached to the
machine. Current flows through the electrode cable to
the electrode holder, through the electrode holder to
the electrode and across the arc. On the work side of
the arc, the current flows through base metal to the
work cable and back to the welding machine. The cir-
cuit must be complete for the current to flow. To weld,
the work clamp must be tightly connected to clean
base metal. Remove paint, rust,etc. as necessary to
get a good connection. Connect the work clamp as
close as possible to the area you wish to weld. Avoid
allowing the welding circuit to pass through hinges,
bearings, electronic components or similar devices
that can be damaged.
Figure B.3 - The welding circuit for shielded metal
arc welding.