Class 4 (4th Engineer) MEKG 📅 Jul 2024

Exam Question

With reference to electric arc welding:

(a) Draw a labeled sectional sketch of a satisfactory butt weld. (4)

(b) Briefly define the following defects that may occur and how they may have been caused: (12)

(i) Under cut

(ii) Splatter

(iii) Inclusion

(iv) Blow hole

(v) Incomplete root penetration

(vi) Lack of fusion

Reference Answer

### (a) Labeled Sectional Sketch of a Satisfactory Butt Weld
A satisfactory butt weld exhibits complete fusion between the parent metal and the filler metal, with proper penetration to the root of the joint. The sketch should illustrate the following key features clearly labeled:
* **Parent Metal**: The original plates being joined.
* **Weld Metal**: The solidified filler material forming the joint.

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