Question 4
(a) List three tools suitable for cutting sheet metal in the workshop.
(b) (i) Sketch an example of a component made from sheet metal with a beaded edge.
- State one purpose of the beaded edge.
(c) (i) State one reason why high carbon steel can be hardened by heating and quenching.
(ii) State one reason why mild steel cannot be hardened by heating and quenching.
(d)List three forging tools.
Observation
Parts (b) and (c) posed some difficulties to the candidates. The expected responses are as given below:
(b)
(i) Sketching an example of a component made from sheet metal with a beaded edge
(ii) one purpose of beaded edge
A beaded edge is used where sharp edges may be dangerous and unsafe.
(c)
(i) why high carbon steel can be hardened by heating and quenching
Hardening is possible because of its comparatively high carbon content.
(ii) why mild steel cannot be hardened by heating and quenching
Mild steel cannot be hardened by heating and quenching because of its low carbon content.