Final answer:
Friction Stir Welding (FSW) is a welding process that does not require a filler wire and is commonly used for small welds. Arc welding (option c) is suitable for larger welds. FSW was invented for long continuous welds in aluminum (option b) extrusions and is also used for welding dissimilar metals(option c).
Step-by-step explanation:
FSW stands for Friction Stir Welding. In Friction Stir Welding, heat is generated by the friction between the rotating tool and the workpieces. The filler used in Friction Stir Welding is the parent material itself, without the need for additional filler wire. Therefore, the correct answer to the first question is (a) No.
For small welds, Friction Stir Welding can be used, but for larger welds, dedicated equipment is needed. Arc welding, which uses an electric arc to melt and join the metals, is commonly used for larger welds. Hence, the correct answer to the second question is (b) Arc welding.
Friction Stir Welding was invented specifically for making long continuous welds in aluminum extrusions. Aluminum is a lightweight metal commonly used in various industries, and Friction Stir Welding allows for efficient and high-quality welding of aluminum extrusions. Therefore, the correct answer to the third question is (b) Aluminum.
Friction Stir Welding is also a common choice for welding dissimilar metals. Dissimilar metals refer to two or more metals with different properties or compositions. Friction Stir Welding can effectively join dissimilar metals, making it suitable for various applications. Hence, the correct answer to the fourth question is (c) Dissimilar metals.