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Question: question 5 a discuss the main advantages and disadvantages of...

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Question 5: (a) Discuss the main advantages and disadvantages of manual metal arc welding (MMAW). 4 Marks] (b) Describe the importance of heat input (HI) in MMAW process. Highlight the interrelationship between the cooling rate and HI towards achieving high quality welding. 4 Marks] (c) Two pieces of a mild steel specimen will be welded together using MMAW technique. The welding voltage used is 50 V, the current used is 100 A while the welding speed applied is 150 mm/min. Calculate the heat input (HI) and discuss the influence of Hl towards on the heat affected zone (HAZ). [8 Marks] (d) Describe the importance of pre-heating and post-weld heat treatment process in low carbon and low alloy steels. 4 Marks] Formula for Question 5 is as follows 60VI HI=- 1000S
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