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Shielded Metal Arc Welding
Arc Welding? Uses electricity for heat
Arc Welding ? Electrodes (Rods) covered with flux
Arc Welding? Gas cloud (Shield) around the metal during welding
Arc Welding Heat for arc welding comes from electricity
Welder = machine used for welding that produces a current Arc Welding
Arc = discharge of electricity Weldor = a person who welds Arc Welding
Electrodes = flux coated metal rods Arc Welding
Electrode Holder = spring loaded device with insulated handles used to grip the electrode
Ground Clamp = spring loaded clamp that is attached to an electrical cable Arc Welding
Chipping Hammer = steel hammer with a sharp edge/point and a wire brush Arc Welding
Helmets = cover your head and neck region-- a # 10 shield is required
Safety Glasses = must be worn under the welding helmet Arc Welding
Welding Gloves = insulated gloves worn to protect hands from heat and sparks (not 100%) Arc Welding
W = Watts = measure of energy available W = V X A
V = Voltage = measure of electrical pressure W = V X A
A = Amp = rate of flow of current W = V X A
Temperature Arc can be up to 9000 degrees F.
Temperature Depends on: –Arc Length –Electrode type –Amp Setting –Base Metal
Duty Cycle The percentage of time that a welder can operate without overheating The number of minutes out of 60 that a welder can operate at full capacity
Duty Cycle The number of minutes out of 60 that a welder can operate at full capacity
AC/DC AC –Alternating Current –Rev. Direction
AC/DC AC -U.S. 60 Cycles per second
AC/DC AC –Use Transformers to step-down voltage and increase amps
AC/DC DC –Direct Current –Electricity flows in one direction
AC/DC DC –Straight vs. Reverse Polarity –Use Generators to produce the DC
Electrode Coding NEMA Uses color coding on the rods 3 areas on the rod
Electrode Coding AWS # coding system on the rods Each # stands for something
E6013 E = Electrode 60 = Tensile Strength 1 = Welding Position 3 = Welding Current
Flux Shields Outside gasses
Flux Combines with metal impurities
Flux Forms Slag Makes and Maintains Arc
What Affects a Weld Bead??? Temp of Base Metal –Adjust your Amps
What Affects a Weld Bead??? Electrode Diameter and Flux Type
What Affects a Weld Bead??? Amps –Select according to the thickness of your metal
What Affects a Weld Bead??? Arc Length –“Frying Bacon”
What Affects a Weld Bead??? Electrode Angle –10 to 15 degrees from vertical
What Affects a Weld Bead??? Speed of Travel –Even across the metal
Arc Welding Safety Weld on a proper surface Fire Exting./blanket nearby
Arc Welding Safety Surrounding area??? Wear all safety equipment/gear
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Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Unit 27 Arc Welding Mild Steel and GMAW/GTAW Welding.
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