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Questions and Answers
The feature that distinguishes fusion welding from solid-state welding is that melting of the faying surfaces occurs during fusion welding but not in solid-state welding.
The feature that distinguishes fusion welding from solid-state welding is that melting of the faying surfaces occurs during fusion welding but not in solid-state welding.
True (A)
Which of the following processes are classified as fusion welding? (Select three correct answers)
Which of the following processes are classified as fusion welding? (Select three correct answers)
- Ultrasonic welding
- Explosion welding
- Laser-beam welding (correct)
- Electrogas welding (correct)
- Forge welding
- Electron-beam welding (correct)
Which of the following processes are classified as solid-state welding? (Select three correct answers)
Which of the following processes are classified as solid-state welding? (Select three correct answers)
- Resistance seam welding
- Roll welding (correct)
- Friction welding (correct)
- Cross-wire welding
- Diffusion welding (correct)
- Pressure gas welding
- Stud welding
Filler metal is always added when consumable electrodes are used and never added when nonconsumable electrodes are used.
Filler metal is always added when consumable electrodes are used and never added when nonconsumable electrodes are used.
An electric arc is a discharge of current across a gap in an electrical circuit. The arc is sustained in arc welding processes by the transfer of molten metal across the gap between the electrode and the work.
An electric arc is a discharge of current across a gap in an electrical circuit. The arc is sustained in arc welding processes by the transfer of molten metal across the gap between the electrode and the work.
Which two of the following are common gases used for shielding in arc welding? (Select two correct answers)
Which two of the following are common gases used for shielding in arc welding? (Select two correct answers)
Which one of the following arc welding processes has the lowest heat transfer factor?
Which one of the following arc welding processes has the lowest heat transfer factor?
Which one of the following arc welding processes uses a nonconsumable electrode?
Which one of the following arc welding processes uses a nonconsumable electrode?
MIG welding is a term sometimes applied when referring to which one of the following processes?
MIG welding is a term sometimes applied when referring to which one of the following processes?
"Stick" welding is a term sometimes applied when referring to which one of the following processes?
"Stick" welding is a term sometimes applied when referring to which one of the following processes?
Which one of the following arc welding processes uses an electrode consisting of continuous consumable tubing containing flux and other ingredients in its core?
Which one of the following arc welding processes uses an electrode consisting of continuous consumable tubing containing flux and other ingredients in its core?
Which one of the following arc-welding processes produces the highest temperatures?
Which one of the following arc-welding processes produces the highest temperatures?
Resistance-welding processes make use of the heat generated by electrical resistance to achieve fusion of the two parts to be joined; no pressure is used in these processes, and no filler metal is added.
Resistance-welding processes make use of the heat generated by electrical resistance to achieve fusion of the two parts to be joined; no pressure is used in these processes, and no filler metal is added.
Metals that are easiest to weld in resistance welding are ones that have low resistivities since low resistivity assists in the flow of electrical current.
Metals that are easiest to weld in resistance welding are ones that have low resistivities since low resistivity assists in the flow of electrical current.
The rate of heat energy supplied in a resistance spot welding operation is determined by which one of the following equations?
The rate of heat energy supplied in a resistance spot welding operation is determined by which one of the following equations?
The fused zone between the two parts in a resistance spot welding operation is called which one of the following?
The fused zone between the two parts in a resistance spot welding operation is called which one of the following?
Oxyacetylene welding is the most widely used oxyfuel welding process because acetylene mixed with an equal volume of oxygen burns hotter than any other commercially available fuel.
Oxyacetylene welding is the most widely used oxyfuel welding process because acetylene mixed with an equal volume of oxygen burns hotter than any other commercially available fuel.
The term "laser" stands for "light actuated system for effective reflection."
The term "laser" stands for "light actuated system for effective reflection."
Thermite used in thermit welding is a mixture of which two of the following powder ingredients? (Select two correct answers)
Thermite used in thermit welding is a mixture of which two of the following powder ingredients? (Select two correct answers)
Friction stir welding is a fusion welding process in which a rotating tool is fed along the joint line between two workpieces, generating friction heat and mechanically stirring the metal to form the weld seam.
Friction stir welding is a fusion welding process in which a rotating tool is fed along the joint line between two workpieces, generating friction heat and mechanically stirring the metal to form the weld seam.
Which of the following solid-state welding processes applies heat from an external source? (Select two best answers)
Which of the following solid-state welding processes applies heat from an external source? (Select two best answers)
The term weldability takes into account not only the ease with which a welding operation can be performed, but also the quality of the resulting weld.
The term weldability takes into account not only the ease with which a welding operation can be performed, but also the quality of the resulting weld.
Copper is a relatively easy metal to weld because its thermal conductivity is high.
Copper is a relatively easy metal to weld because its thermal conductivity is high.
Flashcards
Fusion welding
Fusion welding
A welding process where the faying surfaces of the materials are melted together.
Solid-state welding
Solid-state welding
Welding processes that do not involve melting the materials being joined. These processes rely on other mechanisms like pressure or diffusion.
Consumable electrode
Consumable electrode
An electrode used in arc welding that consumes itself during the welding process, adding filler metal to the weld joint.
Nonconsumable electrode
Nonconsumable electrode
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Electric arc
Electric arc
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Shielding gases
Shielding gases
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Heat transfer factor
Heat transfer factor
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Weldability
Weldability
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GMAW (Gas Metal Arc Welding)
GMAW (Gas Metal Arc Welding)
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GTAW (Gas Tungsten Arc Welding)
GTAW (Gas Tungsten Arc Welding)
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SMAW (Shielded Metal Arc Welding)
SMAW (Shielded Metal Arc Welding)
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FCAW (Flux-Cored Arc Welding)
FCAW (Flux-Cored Arc Welding)
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Resistance welding
Resistance welding
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Resistance spot welding
Resistance spot welding
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Electrical resistivity
Electrical resistivity
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Oxyacetylene welding
Oxyacetylene welding
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Laser welding
Laser welding
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Thermite welding
Thermite welding
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Friction stir welding
Friction stir welding
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Rate of heat energy in resistance spot welding
Rate of heat energy in resistance spot welding
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Weld quality
Weld quality
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Copper weldability
Copper weldability
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Study Notes
Fusion vs. Solid-State Welding
- Fusion welding involves melting of faying surfaces, while solid-state welding does not.
- Examples of fusion welding processes include electrogas, electron-beam, and laser-beam welding.
Solid-State Welding Processes
- Solid-state welding does not require melting of base materials.
- Key processes include diffusion welding, friction welding, and stud welding.
Electrodes in Arc Welding
- Electrodes can be consumable (filler metal added) or nonconsumable (no filler metal).
- Nonconsumable electrodes are used in processes like GTAW (TIG welding).
Electrical Arc and Shielding Gases
- An electric arc sustains current across a gap in the electrode and work.
- Common shielding gases in arc welding include argon and helium.
Heat Transfer in Arc Welding
- GTAW has the lowest heat transfer factor among common arc welding processes.
- The heat generated in welding affects the quality and integrity of the weld.
Welding Terms and Processes
- MIG welding often refers to GMAW, while "stick" welding refers to SMAW.
- FCAW uses continuous consumable tubing for the electrode containing flux.
Resistance Welding Dynamics
- Resistance welding utilizes electrical resistance to generate heat for fusion.
- Easiest metals to weld have low resistivities, facilitating current flow.
Rate of Heat Energy in Resistance Spot Welding
- Rate of heat energy is calculated using RH = I²Rt, where I is current, R is resistance, and t is time.
Oxyacetylene and Laser Welding
- Oxyacetylene welding is recognized for its high temperature due to acetylene and oxygen.
- The term "laser" does not correspond to "light actuated system for effective reflection."
Thermite and Friction Stir Welding
- Thermite welding utilizes aluminum and iron oxide as its key components.
- Friction stir welding generates heat through mechanical stirring via a rotating tool.
Weldability and Materials
- Weldability assesses both the ease of performing a welding operation and the weld quality.
- Copper is easier to weld despite having high thermal conductivity.
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Description
Test your knowledge on the key differences between fusion welding and solid-state welding as well as various welding processes. This quiz will cover essential concepts and processes related to welding techniques. Dive in to see how well you understand welding classifications!
