Exam Question
With reference to electric arc 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
📅 Mar 2025
Reference Answer
### (a) Labeled Sectional Sketch of a Satisfactory Butt Weld
A satisfactory butt weld is one that achieves complete fusion between the parent metals while meeting specific geometrical and metallurgical standards, ensuring the joint is free from defects and possesses the required mechanical strength. The key features, as would be shown in a labeled sectional sketch, are as follows:
* **Parent Metal:** The two pieces of metal being joined.
* **Weld Zone / Fusion Zone:** The area where the parent metal has been melted and fused together with the filler metal.
A satisfactory butt weld is one that achieves complete fusion between the parent metals while meeting specific geometrical and metallurgical standards, ensuring the joint is free from defects and possesses the required mechanical strength. The key features, as would be shown in a labeled sectional sketch, are as follows:
* **Parent Metal:** The two pieces of metal being joined.
* **Weld Zone / Fusion Zone:** The area where the parent metal has been melted and fused together with the filler metal.
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