Question 3
(a) Stateone workshop test each to identify the following metals:
(i) mild steel;
(ii) aluminium.
(b) Arrange the following metals from the most ductile to the least ductile:
(i) low carbon steel;
(ii) copper;
(iii) lead;
(iv) aluminium.
(c) Explain the following terms as used in foundry work:
(i) gating;
(ii) pouring.
(d) What is fettling in casting.
Observation
The candidates had difficulty in providing correct responses the questions. The required responses are as follows:
Stating one workshop test each to identify the following metals
Mild steel- hammering, scratching, cutting, dropping, bending.
Aluminium- bending, hammering, dropping, cutting, scratching.
Arranging metals from most ductile to least ductile
- copper
- aluminium
- low carbon steel
- lead
Explaining the following as used in foundry work
Gating: Creating a channel through which molten metal flows into the mould cavity.
Pouring is the process of filling mould with molten metal.
Defining fettling
Fettling is cutting away excess metals on castings.