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.
True
Which of the following processes are classified as fusion welding? (Select three correct answers)
Which of the following processes are classified as solid-state welding? (Select three correct answers)
Filler metal is always added when consumable electrodes are used and never added when nonconsumable electrodes are used.
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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.
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Which two of the following are common gases used for shielding in arc welding? (Select two correct answers)
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Which one of the following arc welding processes has the lowest heat transfer factor?
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Which one of the following arc welding processes uses a nonconsumable electrode?
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MIG welding is a term sometimes applied when referring to which one of the following processes?
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"Stick" welding is a term sometimes applied when referring to which one of the following processes?
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Which one of the following arc welding processes uses an electrode consisting of continuous consumable tubing containing flux and other ingredients in its core?
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Which one of the following arc-welding processes produces the highest temperatures?
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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.
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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.
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The rate of heat energy supplied in a resistance spot welding operation is determined by which one of the following equations?
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The fused zone between the two parts in a resistance spot welding operation is called which one of the following?
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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.
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The term "laser" stands for "light actuated system for effective reflection."
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Thermite used in thermit welding is a mixture of which two of the following powder ingredients? (Select two correct answers)
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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.
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Which of the following solid-state welding processes applies heat from an external source? (Select two best answers)
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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.
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Copper is a relatively easy metal to weld because its thermal conductivity is high.
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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!
