Answer :
Final answer:
The welding process that does not use pressure is submerged arc welding. This method utilizes heat to join materials beneath a layer of flux without applying external pressure. Other processes mentioned do involve some form of pressure during the welding operation.
Explanation:
Welding Processes Overview
Welding is a fundamental fabrication process that joins metal materials using heat and various forms of energy, such as gas, electricity, or lasers. Each welding process has its characteristics, and there are various methods that employ different techniques.
Understanding Non-Pressure Welding
Among the options provided, the answer to the question of which welding process does not use pressure is:
- C. Submerged arc welding
Submerged arc welding is characterized by the formation of an arc between a continuously fed electrode and the workpiece. The process occurs beneath a blanket of granular flux, which keeps the arc shielded from the atmosphere without applying significant pressure to the materials being joined. In contrast, techniques such as flash welding, projection welding, and upset welding all involve the application of pressure to join materials together effectively.
Conclusion
Understanding different welding processes is crucial for engineers and technicians to select the right method for specific applications. Each process varies in terms of technique, efficiency, and suitability for different materials and thicknesses.
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