Arc Arc WeldingWelding

EquipmentEquipmentPrepared byPrepared by

Dr. Dale Carpentier andDr. Dale Carpentier and

Mr. Barry BrazeltonMr. Barry Brazelton

Monroe Area High SchoolMonroe Area High SchoolModified by Georgia Agriculture Education Curriculum Office

June 2007

Miller Dialarc Miller Dialarc 250/250P AC/DC Arc 250/250P AC/DC Arc

Welder and Welder and equipmentequipment

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

Power SwitchPower Switch

Used to turn Used to turn welder on and offwelder on and off

Range Selector SwitchRange Selector Switch Use switch to select Use switch to select

ac or dc welding ac or dc welding amperage.amperage.

High and Low rangeHigh and Low range If amperage is in If amperage is in

overlapping range use overlapping range use lower range for better lower range for better amperage control.amperage control.

Do not change Do not change position of switch position of switch while welding.while welding.

Amperage Adjustment Amperage Adjustment ControlControl

Use control to Use control to adjust amperage.adjust amperage.

Inside dial is ac Inside dial is ac low and high low and high range. range.

Outside ring is dc Outside ring is dc low and high low and high range.range.

Do not adjust when Do not adjust when circuit is closed.circuit is closed.

Circuit Breaker, CB1Circuit Breaker, CB1

If CB1 opens, weld If CB1 opens, weld output drops to the output drops to the minimum of the minimum of the range selected, and range selected, and cannot be adjusted cannot be adjusted by the Amperage by the Amperage Adjustment control.Adjustment control.

Press button to Press button to reset breaker.reset breaker.

Duty CycleDuty Cycle Duty Cycle is the Duty Cycle is the

percentage of 10 percentage of 10 minutes that unit minutes that unit can weld at rated can weld at rated load without load without overheating.overheating.

100% duty cycle @ 100% duty cycle @ 100 amps or less.100 amps or less.

Exceeding duty Exceeding duty cycle can damage cycle can damage unit by overheating.unit by overheating.

Cable attachments for Cable attachments for AC & DCAC & DC

Cables are Cables are attached for AC attached for AC welding.welding.

Do not walk on Do not walk on cables.cables.

Do not change to Do not change to DC welding DC welding without instructor without instructor approval.approval.

Ground ClampGround Clamp

Must be attached Must be attached to welding table or to welding table or metal to be welded metal to be welded in order to in order to complete welding complete welding circuit.circuit.

You must clean You must clean painted, dirty, or painted, dirty, or rusted metal to get rusted metal to get a good ground.a good ground.

Electrode HolderElectrode Holder

Insulated.Insulated. Holds electrodes Holds electrodes

while welding.while welding. Do not burn Do not burn

electrodes shorter electrodes shorter than 1 inch.than 1 inch.

Welding TableWelding Table

Must be made of Must be made of metal.metal.

Hang cables on Hang cables on hooks rather than hooks rather than laying on floor.laying on floor.

Position exhaust Position exhaust vent near welding vent near welding base metal.base metal.

Welding ElectrodesWelding Electrodes Standard diameter sizes Standard diameter sizes

are 3/32”, 1/8”, and 5/32”.are 3/32”, 1/8”, and 5/32”. 6013 rod is for new metal. 6013 rod is for new metal.

Attractive bead. Easy to Attractive bead. Easy to weld with.weld with.

6011 rod is for used and 6011 rod is for used and dirty metal. Deep dirty metal. Deep penetration. Most penetration. Most utilitarian rod for farm and utilitarian rod for farm and ranch use.ranch use.

7014 rod is a fast fill rod 7014 rod is a fast fill rod that produces attractive that produces attractive welds.welds.

7018 is a low hydrogen 7018 is a low hydrogen rod. Best with DCRP.rod. Best with DCRP.

Welding Helmet or Welding Helmet or ShieldShield

Used to protect Used to protect face and eyes.face and eyes.

Must have a Must have a shade10 lens, shade10 lens, minimum.minimum.

Other EquipmentOther Equipment

Chipping hammerChipping hammer Used to remove slag.Used to remove slag.

Welding gloves.Welding gloves.

Used to protect Used to protect hands.hands.

Wire brush and file.Wire brush and file.

Used to clean metal.Used to clean metal.

Tongs Tongs

Used to carry hot Used to carry hot metal.metal.