Arc Welder Power Sources Flashcards
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Questions and Answers

What does AC stand for?

Alternating Current

What is alternating current?

Current that regularly reverses the direction of its flow.

What measurement indicates the amount of current flowing in a circuit?

Amperage

An electrical terminal that usually carries a positive charge is known as an ______.

<p>anode</p> Signup and view all the answers

A condition that occurs when the arc does not follow its intended path from the electrode to the workpiece is called ______ ____.

<p>arc blow</p> Signup and view all the answers

The distance the arc stretches from the electrode to the workpiece is known as arc ______.

<p>length</p> Signup and view all the answers

A device found in generators that has many separate coils wound around it is called an ______.

<p>armature</p> Signup and view all the answers

What is a CC welder?

<p>Constant Current Welder</p> Signup and view all the answers

What does the term 'duty cycle' refer to?

<p>The amount of time in a ten-minute period that a welder can perform work without overheating.</p> Signup and view all the answers

What is the definition of electricity?

<p>The energy created by the movement of electrons.</p> Signup and view all the answers

What is the purpose of a rectifier?

<p>An electrical device that converts AC power to DC power.</p> Signup and view all the answers

What type of electrode is used for welding specialized materials that are susceptible to cracking?

<p>Low-hydrogen Electrode</p> Signup and view all the answers

What does SCR stand for in welding technology?

<p>Silicon-Controlled Rectifier</p> Signup and view all the answers

The relationship between the amount of power a welder draws from the power company and the amount of power it returns is known as ______ ______.

<p>power factor</p> Signup and view all the answers

A type of transformer that converts high-voltage, low-amperage industrial power to low-voltage, high-amperage power is called a - transformer.

<p>step-down</p> Signup and view all the answers

A magnet formed from electric current is known as an _______.

<p>electromagnet</p> Signup and view all the answers

Study Notes

Welding Electrical Terms and Concepts

  • AC (Alternating Current): Current that reverses direction regularly; used in processes like GTAW.
  • Direct Current (DC): Flow of current in one direction; essential for GMAW and FCAW.
  • Amperage: Measurement of current in a circuit, quantified in amperes.
  • Voltage: The electrical pressure driving current flow, measured in volts.

Welding Components and Operation

  • Anode: Positive electrical terminal; crucial for SCR operation when negative.
  • Cathode: Negative electrical terminal; must be positive for SCR activation.
  • Arc Length: Distance between electrode and workpiece; longer lengths necessitate higher voltage.
  • Electric Arc: Area where electrical discharge occurs, generating heat for melting metals.

Welding Processes

  • Gas Tungsten Arc Welding (GTAW): Precise welding using a nonconsumable tungsten electrode.
  • Gas Metal Arc Welding (GMAW): Involves a bare wire electrode and shielding gas, also known as MIG welding.
  • Flux-Cored Arc Welding (FCAW): Uses a consumable electrode with a flux center.
  • Shielded Metal Arc Welding (SMAW): Involves flux-coated rods, often called stick welding.

Power Sources and Electromagnetic Components

  • Power Factor: Ratio of power drawn versus returned; optimal is 1 or 100%.
  • Inverter: Welding power source using high frequency, improving energy efficiency.
  • SCR (Silicon-controlled rectifier): Controls current direction in output, allowing for efficient power management.
  • Transformer: Device that adjusts voltage levels through primary and secondary windings.

Electrical Measurements and Behavior

  • Duty Cycle: Time duration a welder can operate in a given period without overheating; higher preferences are better.
  • Resistance: Opposition to current flow; electricity prefers the path of least resistance.
  • Output: Represents produced power types, including AC, DC, CC, and CV.

Safety and Operational Features

  • Primary Voltage Shock: Risks from high voltage exposure during operation; safety precautions necessary.
  • Hot Start: Feature that enables high initial settings to reduce sticking of electrodes.
  • Reverse Polarity: Current flows from a negative workpiece to positive electrode; alters welding characteristics.

Specialized Electrodes and Techniques

  • Low-Hydrogen Electrode: For welding materials prone to cracking.
  • High-Deposition Electrode: Designed to deposit a larger filler metal amount.
  • Pulse Welding: A method creating one droplet of metal at a time, requiring high welder settings.

Miscellaneous Concepts

  • Inductance Coil/Choke: Smoothens DC power from rectifiers and affects amperage.
  • Static Volt-Ampere Curve: Graphical representation of a welder's voltage versus amperage output.
  • Energy Efficient: Devices using less electricity, reducing overall costs.

Miscellaneous Electrical and Magnetism

  • Electromagnet: Formed by current, often used in devices requiring magnetic fields.
  • Magnetic Field: Regions affected by magnetic forces, essential for electric motor functions.
  • Field Winding: Electromagnet wire generating the magnetic field within generators.

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Test your knowledge on key terms related to arc welding power sources with these flashcards. From definitions of alternating current to the concept of amperage, this quiz will help reinforce important concepts in welding technology. Perfect for students and professionals alike.

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