MFGE 337.HW#5.Joining.W16 (1)

MFGE 337.HW#5.Joining.W16 (1) - Assignment#5 MFGE 337...

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Assignment #5 Joining Processes (61 points total) MFGE 337 Materials & Manufacturing Processes Multiple Choice (1 point for each question = 21 points): 28.1 For metallurgical reasons, it is desirable to melt the weld metal with minimum energy input. Which one of the following heat sources is most consistent with this objective: (a) high power, (b) high power density, (c) low power, or (d) low power density? 28.2 An autogenous weld is best described as which one of the following: (a) a fusion- welding operation in which filler metal is added, (b) a fusion-welding operation in which no filler metal is added, (c) a fusion-welding operation in which no heat is applied, or (d) a solid-state welding operation in which no heat or pressure are applied? 28.3 The amount of heat required to melt a given volume of metal depends strongly on which of the following properties (three best answers): (a) coefficient of thermal expansion, (b) heat of fusion, (c) melting temperature, (d) modulus of elasticity, (e) specific heat, (f) thermal conductivity, and (g) thermal diffusivity? 28.4 The heat transfer factor in welding is correctly defined by which one of the following descriptions: (a) the proportion of the heat received at the work surface that is used for melting, (b) the proportion of the total heat generated at the source that is received at the work surface, (c) the proportion of the total heat generated at the source that is used for melting, or (d) the proportion of the total heat generated at the source that is used for welding? 28.5 The melting factor in welding is correctly defined by which one of the following descriptions: (a) the proportion of the heat received at the work surface that is used for melting, (b) the proportion of the total heat generated at the source that is received at the work surface, (c) the proportion of the total heat generated at the source that is used for melting, or (d) the proportion of the total heat generated at the source that is used for welding?
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