Engineering

The stresses and strains in metal forming are of which type? elastic O plastic ultimate O fracture none of these The applied stresses in most bulk deformation processes are shear tensile O compressive O bending none of these What is the difference between the physical shape of bulk deformation and sheet metalworking manufacturing processes? In bulk deformation, the work parts have a _ area-to-volume ratio, whereas in sheet metalworking, the area-to-volume ratio is O low, high O high , low O high, high O low, low _ is a bulk deformation process in which a workpiece is compressed between two opposing dies, so that the die shapes are imparted to the work O rolling O forging O drawing extrusions O none of these _ is a compression bulk deformation process in which the work material is forced to flow through a die orifice, thereby forcing its cross section to assume the profile of the orifice O forging extrusion O drawing O extending O rolling none of these is a bulk deformation process in which the diameter of a round wire is reduced by pulling it through a die opening of smaller diameter than the wire O forging O rolling O ring rolling O ring piercing O wire lifting extrusion none of these

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A resistance spot-welding operation performed on two pieces of 2.5 mm thick sheet steel uses 12,000 amps for a 0.20 s duration. The electrodes are 6 mm in diameter at the contacting surfaces. Resistance is assumed to be 0.0001  and the resulting weld nugget is 6 mm in diameter and averages 3 mm in thickness. The unit melting energy for the metal Um = 12.0 J/mm3. What portion of the heat generated was used to form the weld nugget, and what portion was dissipated into the work metal, electrodes, and surrounding air?

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A resistance spot-welding operation performed on two pieces of 2.5 mm thick sheet steel uses 12,000 amps for a 0.20 s duration. The electrodes are 6 mm in diameter at the contacting surfaces. Resistance is assumed to be 0.0001  and the resulting weld nugget is 6 mm in diameter and averages 3 mm in …

A resistance spot-welding operation performed on two pieces of 2.5 mm thick sheet steel uses 12,000 amps for a 0.20 s duration. The electrodes are 6 mm in diameter at the contacting surfaces. Resistance is assumed to be 0.0001  and the resulting weld nugget is 6 mm in diameter and averages 3 mm in thickness. The unit melting energy for the metal Um = 12.0 J/mm3. What portion of the heat generated was used to form the weld nugget, and what portion was dissipated into the work metal, electrodes, and surrounding air? Read More »

3 (a) Discuss the advantages and disadvantages of welding compared to other types of assembly operations? ​​​​​​​3 (b) Explain the three main Rapid Prototyping Process. Discuss the advantage and limitation of each process.

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3 (a) Discuss the advantages and disadvantages of welding compared to other types of assembly operations?​​​​​​​3(b) Explain the three main Rapid Prototyping Process. Discuss the advantage and limitation of each process. EXPERT ANSWER 3. a) Merits and demerits of welding Merits As no hole is required for welding, hence no reduction of area. So structural …

3 (a) Discuss the advantages and disadvantages of welding compared to other types of assembly operations? ​​​​​​​3 (b) Explain the three main Rapid Prototyping Process. Discuss the advantage and limitation of each process. Read More »

152. Why is a surfacing weld different from the other weld types? 153. Why is it desirable to use energy sources for welding that have high heat densities? 154. What is the unit melting energy in welding, and what are the factors on which it depends? 155. Define and distinguish the two terms heat transfer factor and melting factor in welding. 156. What is the heat-affected zone in a fusion weld? 157. How do brazing and soldering differ from the fusion-welding processes? 158. How do brazing and soldering differ from the solid-state welding processes? 159. What is the technical difference between brazing and soldering? 160. Under what circumstances would brazing or soldering be preferred over welding? 161. What are the two joint types most commonly used in brazing?

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EXPERT ANSWER 152. Why is a surfacing weld different from the other weld types? A surfacing weld is done to place the filler materials onto the surface of the base metal in the form of weld beads. It is different from other weld types because it is not made to join parts, only to add …

152. Why is a surfacing weld different from the other weld types? 153. Why is it desirable to use energy sources for welding that have high heat densities? 154. What is the unit melting energy in welding, and what are the factors on which it depends? 155. Define and distinguish the two terms heat transfer factor and melting factor in welding. 156. What is the heat-affected zone in a fusion weld? 157. How do brazing and soldering differ from the fusion-welding processes? 158. How do brazing and soldering differ from the solid-state welding processes? 159. What is the technical difference between brazing and soldering? 160. Under what circumstances would brazing or soldering be preferred over welding? 161. What are the two joint types most commonly used in brazing? Read More »

The welding process in this image is 1 point Solid wire electrode Shielding gas Current conductor Travel Wire guide and contact tube Nozzle Solidified weld metal Shielding gas Arc Base metal Molten weld metal SMAW GMAW O TIG O Oxy-Acetylene

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EXPERT ANSWER 1.In Tig welding, external wire is used to feed or weld since Tungsten elecrtrode is non – consumable . So this is not TIG welding. 2. This is not oxy-acetylene welding, because in oxy-acetylene welding two cylinder is used for carrying oxygen and acetylene. 3. In SMAW, arc submerged in granular flux of …

The welding process in this image is 1 point Solid wire electrode Shielding gas Current conductor Travel Wire guide and contact tube Nozzle Solidified weld metal Shielding gas Arc Base metal Molten weld metal SMAW GMAW O TIG O Oxy-Acetylene Read More »

26.20 What is friction stir welding (FSW), and how is it different from friction welding?

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26.20 What is friction stir welding (FSW), and how is it different from friction welding? EXPERT ANSWER Friction stir welding is fusion welding process in this friction stir tool is used to join the metals. The tool has a small probe projecting out from the shoulderd tool which sits at the joint line of two …

26.20 What is friction stir welding (FSW), and how is it different from friction welding? Read More »