Exam Question
With reference to electric are welding:
(a) Draw a labeled sectional sketch of a satisfactory butt weld (8)
(b) Discuss the advantages and disadvantages of using alternating current and direct current in this type of welding (8)
Class 4 (4th Engineer)
MEKG
📅 May 2024
Reference Answer
### (a) Satisfactory Butt Weld Sketch
A satisfactory single V-butt weld joins two plates in the same plane. A sectional sketch would reveal the following key features, ensuring the weld meets stringent quality and strength standards:
* **Parent Metal:** The two plates to be joined, showing the prepared V-groove angle (typically 60-75 degrees).
* **Root Face & Root Gap:** A small vertical face at the bottom of the V (root face) and a specified gap between the plates (root gap) are crucial for achieving full penetration.
A satisfactory single V-butt weld joins two plates in the same plane. A sectional sketch would reveal the following key features, ensuring the weld meets stringent quality and strength standards:
* **Parent Metal:** The two plates to be joined, showing the prepared V-groove angle (typically 60-75 degrees).
* **Root Face & Root Gap:** A small vertical face at the bottom of the V (root face) and a specified gap between the plates (root gap) are crucial for achieving full penetration.
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