Class 4 (4th Engineer) MEKG 📅 Oct 2023

Exam Question

With reference to electric arc welding:

(a) Draw a labeled sectional sketch of a satisfactory butt weld. (5)

(b) Briefly describe the cause of the following defects in welding:

(i) Under cut (1)

(i) Splatter (1)

(iii) Inclusion (1)

(iv) Blow hole (1)

(v) Incomplete root penetration (1)

(vi) Lack of fusion (1)

Reference Answer

### (a) Satisfactory Butt Weld
A satisfactory butt weld is a joint between two pieces of metal lying in the same plane. A sectional view reveals the internal structure and quality of the weld, which must exhibit specific characteristics to be considered acceptable for marine applications.
**Key Features of a Satisfactory Butt Weld:**
* **Complete Fusion:** The weld metal must be thoroughly fused with the parent metal on both sides of the joint and between successive weld runs. There should be no signs of lack of fusion.

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