Question 3
(a) Name the two types of blowpipe used for welding.
(b) Sketch the following types of welding flame:
(i) oxidizing flame;
(ii) carburizing flame;
(iii) neutral flame.
(c) Explain the term polarity, as applied to arc welding.
Most of the candidates attempted this question and their responses were very satisfactory in all but 3(b).
The solution of the poorly attempted part of the question is as given below.
