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36 Cards in this Set
- Front
- Back
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Wire brush
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t
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ground clamp
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t
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electrode holder
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t
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crater
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t
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dc
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t
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ac
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alternating current
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working voltage
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v
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open circuit voltage
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arch welder is on, but there is no voltage available to strike
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volt
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force that causes current flow
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amps
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rate of flowing current
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base metal
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t
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elecrtode
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core wire coated with flux
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fusion
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melting base and filler metal
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reverse polarity
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electrode positive
work negative |
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straight polarity
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electrode negative
work positive |
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overlapping happens when the voltage is set too high
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false
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the root pass is intended to be on top
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false
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weaving the electrode is a technique used to increase the width and volume of the bead
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true
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a dc welder can run on straight or reverse polarity
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true
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as a rule, an electrode is never used that has a diameter thicker than the thickness of the metal to be welded
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true
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when doing vertical or overhead welds, 3/16 is the largest diameter electrode that should always be used
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true
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an ac welder can run on straight or reverse polarity
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false
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lens shade number 10 is adequate for welding 20p amps
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true
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an e7024 has a minimum tensel strength of 7000lbs per sq inch of deposited metal
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false
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too long an arch prevents the gaseous shield from preventing the puddle from contamination
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true
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electrode size is total diameter of the core wire and the coding
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false
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when welding current is too high, poor fusion accurs and beads pile up
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false
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an amp range of 250 to 300 is required for light to medium duty
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false
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a 7018 electrode is all position
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true
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arch welding is a process of fusing metal by heat in an electrical arch
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true
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5 essentials of arch welding
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electrode-correct
amps-correct electrode angle correct arch length correct travel speed |
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correct electrode angle involves two angles
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work- angle perpendicular to the weld...vertical
travel- angle in direction of travel...horizontal |
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the correct angle settings when welding in the horizontal position are...
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5 to 10 work
20 travel |
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list 4 reasons why welding is simplified by welding in the flat position
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better penetration
less fatigue molten metal has less tenancy to run welding speed is increased can use a bigger rod |
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overhead is difficult because...3 reasons
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molten puddle can drop
awkward stance and working against gravity harder to secure uniform beads fatigue |
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list 4 functions of the coding on shielded electrodes
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cleaning and dioxidizing agents
releases carbon dioxide forms slag for protection while metal cools easier arch starting gives better penetration |
