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Q3 (a) Sketch and explain any two methods used to prevent the distortion of ships plates and frames during major welded hull repairs in dry dock.

(b). Explain how EACH of the following hull defects should be dealt with;

(i). A cracked weld;

(ii). A severe indentation in way of a frame;

(iii). Surfaces suffering from general corrosion although the extent of wastage does not warrant plate replacement;

(iv). A bilge head fractured at the forward end.