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47 Cards in this Set
- Front
- Back
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Insufficient gas can cause what problem |
Double arcing |
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A damaged heat shield can cause |
The tip to overheat |
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Best cuts in thin material are produced with |
Low standoff distance |
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Which gas is often used as a secondary gas for cutting stainless |
Argon |
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Which type of plasma gas is used to cut carbon steel |
Compressed air |
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The cooling gas in an air cooled torch blows |
Between the heat shield and the cutting tip |
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Cutting nozzles are normally made of what material? |
Copper |
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Cutting nozzles are normally made of what material |
Copper |
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The purpose of the pilot arc is to what? |
Initiate the main arc |
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What polarity is used for PAC |
DCEN |
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The usual pac Lowe source is usually an invertor or what? |
High voltage transformer rectifier |
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What is the advantage of an inverter type power source for pac |
Small and lightweight |
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When too much molten metal sticks to the edge of the cut what is the usual cause? |
Air pressure too low |
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In which welding position should the carbon electrode be pointing almost parallel to the carbon electrode holder |
Overhead |
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What is the recommend stick out for CAC-A |
4-6” |
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If the air pressure is too low to blow the molten metal from the cut you should... |
Decrease travel speed |
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Which factor is most important in determining the width of the groove? |
Electrode diameter |
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What is one method to increase the depth of the groove being cut |
Decrease travel speed |
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A large travel angle of the electrode produces what kind of groove |
Wide groove |
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If you need a groove 3/8” wide what electrode size would you use? - 1/8 - 1/4 - 3/8 - 1-2 |
1/4” |
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What is the recommended current for a 1/4” electrode |
200-400 amps |
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An AC electrode with an AC welding power source produces a superior cut on what metal? |
Copper |
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Your carbon electrode burns away very quickly and starts to glow red. What do you do |
Reduce amperage settings |
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The carbon electrodes used in caca are actually made with what |
Graphite |
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What is the purpose of the copper coating on the electrode |
Reduces rate of burning |
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A caca carbon electrode that has graphite and arc stabilizers can be used with what |
DCEP, DCEN, and AC |
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Carbon build from the caca process left in the bottom of a groove can cause what |
Brittle weld |
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What is the main difference between a caca electrode holder and a smaw electrode holder |
The air jets |
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Before connecting two dc welding power sources in parallel you should make sure that the what |
Manufacturers representative has been consulted |
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Your connecting dc welding power sources in parallel which of the following statements about how to connect the terminals is correct |
Positive to positive and neg to neg to increase amperage |
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A welding power source for caca should have an open circuit voltage of what |
80 volts |
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Caca on carbon low alloy and stainless steels commonly uses what |
DCEP with a dc electrode |
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What is the air pressure required (in psi) for medium to heavy duty caca |
80-100psi |
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When using 6010 or 6011 electrodes for cutting which type of welding current is required |
DCEN |
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smac works best with what type of welding current |
DCEN |
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Which type of power source is required for smac |
Constant current |
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Smac electrodes produces a high velocity gas and particle stream by using a special coating that what |
Burns slowly |
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On which metal in particular is pac better than caca |
Aluminium |
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On carbon steel pac is mainly used for what |
Custom production cutting |
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Slag is removed from the kerf in pac by the what |
Plasma jet |
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What is the primary purpose of the secondary gas |
To cool the torch |
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Plasma is a gas that has been superheated to the point of where it becomes |
Ionized |
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Fully automatic caca machines offer what |
Greater accuracy |
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How do automatic and semi automatic caca machines differs |
Electrode feed mechanism |
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In foundries caca is commonly used to what |
Remove excess metal from castings |
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Caca should never be used in materials containing cadmium, lead and what |
Beryllium |
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Which type of welding power source is used with caca |
AC or DC |
