Arc Welding
Equipment
Prepared by
Dr. Dale Carpentier and
Mr. Barry Brazelton
Monroe Area High School
Modified by Georgia Agriculture Education Curriculum Office
June 2007
Miller Dialarc 250/250P
AC/DC Arc Welder and
equipment
E.Q. - What are the parts and
functions of the arc welding outfit?
Power Switch

Used to turn welder on
and off
Range Selector Switch




Use switch to select ac or dc
welding amperage.
High and Low range
If amperage is in overlapping
range use lower range for
better amperage control.
Do not change position of
switch while welding.
Amperage Adjustment Control




Use control to adjust
amperage.
Inside dial is ac low and
high range.
Outside ring is dc low
and high range.
Do not adjust when
circuit is closed.
Circuit Breaker, CB1


If CB1 opens, weld
output drops to the
minimum of the range
selected, and cannot be
adjusted by the
Amperage Adjustment
control.
Press button to reset
breaker.
Duty Cycle



Duty Cycle is the
percentage of 10
minutes that unit can
weld at rated load
without overheating.
100% duty cycle @ 100
amps or less.
Exceeding duty cycle can
damage unit by
overheating.
Cable attachments for AC & DC



Cables are attached for
AC welding.
Do not walk on cables.
Do not change to DC
welding without
instructor approval.
Ground Clamp


Must be attached to
welding table or metal to
be welded in order to
complete welding circuit.
You must clean painted,
dirty, or rusted metal to
get a good ground.
Electrode Holder



Insulated.
Holds electrodes while
welding.
Do not burn electrodes
shorter than 1 inch.
Welding Table



Must be made of metal.
Hang cables on hooks
rather than laying on
floor.
Position exhaust vent
near welding base metal.
Welding Electrodes





Standard diameter sizes are 3/32”,
1/8”, and 5/32”.
6013 rod is for new metal.
Attractive bead. Easy to weld with.
6011 rod is for used and dirty
metal. Deep penetration. Most
utilitarian rod for farm and ranch
use.
7014 rod is a fast fill rod that
produces attractive welds.
7018 is a low hydrogen rod. Best
with DCRP.
Welding Helmet or Shield


Used to protect face and
eyes.
Must have a shade10
lens, minimum.
Other Equipment
Chipping hammer
Used to remove slag.
Welding gloves.
Used to protect hands.
Wire brush and file.
Used to clean metal.
Tongs
Used to carry hot metal.
