Question

Exit-hole occurrence is common in:

• A. Electron Beam Welding
• B. Submerged Arc Welding
• C. Friction Welding
• D. Friction Stir Welding

Hint:

Friction stir welding is a solid-state joining process where heat is generated by friction. The occurrence of exit holes is characteristic of this process due to the way the material is stirred and displaced.

Answer 1

The Correct Option is D

Exit holes are a common feature in some welding processes, especially where there is significant material flow or mechanical forces at play. In friction stir welding (FSW), exit holes typically occur due to the nature of the material movement during the welding process. This process involves the stirring of the material in a solid-state using a rotating tool, and as the material is forced through the tool, an exit hole often forms at the back of the weld joint due to the material flow. Why not the other processes?
- Electron Beam Welding is a precision welding process that uses a focused electron beam to melt the material. This process does not commonly result in exit holes, as the material typically melts and solidifies without significant material flow behind the weld.
- Submerged Arc Welding is used primarily for deep penetration welding, and although it does involve high heat input, it does not result in the formation of exit holes as a typical feature.
- Friction Welding involves the generation of heat through friction between two workpieces, and while it creates a solid-state bond, exit holes do not commonly occur in this process either.
Thus, Friction Stir Welding is the process where exit holes are most commonly observed. This occurs due to the way the material is displaced and manipulated during the welding process, making option (D) the correct answer.