Arc Welding Equipment

1
Arc WeldingEquipment

• Prepared by
• Dr. Dale Carpentier and
• Mr. Barry Brazelton
• Monroe Area High School

Modified by Georgia Agriculture Education
Curriculum Office June 2007
2
Miller Dialarc 250/250P AC/DC Arc Welder and
equipment

• E.Q. - What are the parts and functions of the
  arc welding outfit?

3
Power Switch

• Used to turn welder on and off

4
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.

5
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.

6
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.

7
Duty Cycle

• Duty Cycle is the percentage of 10 minutes that
  unit can weld at rated load without overheating.
• 100 duty cycle _at_ 100 amps or less.
• Exceeding duty cycle can damage unit by
  overheating.

8
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.

9
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.

10
Electrode Holder

• Insulated.
• Holds electrodes while welding.
• Do not burn electrodes shorter than 1 inch.

11
Welding Table

• Must be made of metal.
• Hang cables on hooks rather than laying on floor.
• Position exhaust vent near welding base metal.

12
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.

13
Welding Helmet or Shield

• Used to protect face and eyes.
• Must have a shade10 lens, minimum.

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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.