Class 4 (4th Engineer) MEP 📅 Mar 2023

Exam Question

(a) Using a diagrammatic sketch, describe a good welded joint (4)

(b) By diagrammatic sketches describe defects in welded joint and the causes

(i) Porosity (2)

(ii) Inclusions (2)

(iii) Undercut (2)

(iv) Lack of fusion (2)

(v) Crack (2)

(vi) Distortion (2)

Reference Answer

### (a) Good Welded Joint
A good welded joint is one that effectively transfers load between the joined members and meets the design requirements for strength, ductility, and service life without premature failure. It is characterized by specific visual and metallurgical properties that indicate sound workmanship and correct procedure.
**Characteristics of a Good Welded Joint:**
* **Uniform Appearance:** The weld bead should have a consistent width and height (reinforcement) along its entire length. The surface should be smooth with a fine, even ripple pattern.

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