Podcast
Questions and Answers
Electrons flow through a conductor ___.
Electrons flow through a conductor ___.
____ controls the maximum gap the electrons can jump to form the arc.
____ controls the maximum gap the electrons can jump to form the arc.
____ controls the size of the arc.
____ controls the size of the arc.
____ is a measurement of the amount of electrical energy or power in the arc.
____ is a measurement of the amount of electrical energy or power in the arc.
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The temperature of a welding arc is dependent on the ____.
The temperature of a welding arc is dependent on the ____.
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The amount of heat produced by a welding arc is determined by the ____.
The amount of heat produced by a welding arc is determined by the ____.
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Open circuit voltage ____.
Open circuit voltage ____.
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____ can cause an arc to move during a weld.
____ can cause an arc to move during a weld.
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The major classifications of welding machines are ____.
The major classifications of welding machines are ____.
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____ machines are adjusted by turning a handwheel that moves the internal parts closer together or farther apart.
____ machines are adjusted by turning a handwheel that moves the internal parts closer together or farther apart.
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A(n) ____ produces AC, and a(n) ____ produces DC.
A(n) ____ produces AC, and a(n) ____ produces DC.
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A work clamp ____.
A work clamp ____.
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Welding cables should ____.
Welding cables should ____.
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SMAW is a widely used welding process because of its ___________________.
SMAW is a widely used welding process because of its ___________________.
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The unit of measure of electrical pressure is ______________.
The unit of measure of electrical pressure is ______________.
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A 60% duty cycle means that the machine can be used a total of ____ minutes out of every ten minutes at the maximum rated current.
A 60% duty cycle means that the machine can be used a total of ____ minutes out of every ten minutes at the maximum rated current.
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The quantity of heat in a material is a function of both ________ and ________.
The quantity of heat in a material is a function of both ________ and ________.
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Portable welders often have _____ or ______ plug outlets.
Portable welders often have _____ or ______ plug outlets.
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Why is it important to keep portable welders properly tuned?
Why is it important to keep portable welders properly tuned?
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The unit of measure of electrical power is ____________.
The unit of measure of electrical power is ____________.
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The negative side of an electrode arc is called a(n) ____.
The negative side of an electrode arc is called a(n) ____.
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In a(n) ____ welding machine the incoming power is changed from 60 cycles per second to several thousand cycles per second.
In a(n) ____ welding machine the incoming power is changed from 60 cycles per second to several thousand cycles per second.
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The ____ is the percentage of time a welding machine can be used continuously.
The ____ is the percentage of time a welding machine can be used continuously.
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The terms welding cables and ____ mean the same thing.
The terms welding cables and ____ mean the same thing.
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The positive side of an electrode arc is called a(n) ____.
The positive side of an electrode arc is called a(n) ____.
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_________ is a measure of electric pressure.
_________ is a measure of electric pressure.
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A(n) ____ allows a current to flow in one direction only.
A(n) ____ allows a current to flow in one direction only.
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An electric current is the flow of ____.
An electric current is the flow of ____.
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__________________ is the measurement of the amount of electrical energy or power in the arc.
__________________ is the measurement of the amount of electrical energy or power in the arc.
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__________________ is the measurement of the total number of electrons flowing.
__________________ is the measurement of the total number of electrons flowing.
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Study Notes
Electrical Concepts in Welding
- Electrons flow from negative to positive through a conductor.
- Voltage controls the maximum gap electrons can jump to form an arc.
- Amperage is responsible for controlling the size of the arc.
- Wattage measures the electrical energy or power produced by the arc.
Welding Arc Characteristics
- The temperature of a welding arc is influenced by voltage, arc length, and atmospheric conditions.
- The heat produced by a welding arc is primarily determined by the amperage.
- Open circuit voltage is defined as the voltage at the electrode before striking an arc, typically ranging from 10V to 45V.
Equipment and Techniques
- Arcing can move due to uneven flux lines, air currents, and imperfections in the welding material.
- Major classifications of welding machines include multiple coil, movable coil, movable core, and inverter types.
- Movable coil machines are adjusted using a handwheel to change internal configurations.
Power Sources in Welding
- An alternator produces AC, while a generator produces DC.
- Care should be taken with work clamps to avoid overheating and power loss.
- Welding cables should be sufficiently long to reach the work station and should not be placed overhead or in walkways.
SMAW Process and Efficiency
- Stick welding (SMAW) is popular for its low cost, flexibility, and portability.
- The unit of electrical pressure is measured in volts, while the unit of electrical power is measured in watts.
- A machine with a 60% duty cycle can operate for six minutes at maximum rated current within a ten-minute timeframe.
Thermal Properties
- The quantity of heat in a material is based on its temperature and mass.
- Portable welders typically feature 110-volt or 220-volt outlets to accommodate different electrical supplies.
Maintenance and Performance
- Proper tuning of portable welders is necessary to minimize air pollution, reduce noise, and ensure smoother welding current.
- The negative side of an electrode in welding is referred to as the cathode, while the positive side is called the anode.
Key Terminology
- Voltage represents electric pressure.
- A rectifier allows current to flow in one direction only.
- Electric current is the flow of electrons, and amperage measures the total number of electrons flowing.
- Wattage is the measurement of electrical energy or power in the arc, while welding leads and welding cables are interchangeable terms.
Understanding these concepts and terminologies is critical for effective welding performance and machine operation.
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Description
Test your knowledge of key concepts from Chapter 3 of welding. This quiz includes fundamental questions about electron flow, voltage, and arc characteristics. Perfect for reinforcing your understanding of welding principles.
