Hammering and shaping a hot steel block on an anvil is an example of: a) Open-die...

Hammering and shaping a hot steel block on an anvil is an example of: a) Open-die forging. b) Closed-die forging. c) Flashless forging. d) Impression die forging.

Resistance spot welding can be used to join sheets of _______ and_______. a) Rubber, steel. b) PVC plastics, copper. c) Stainless steel, leather. d) None of the above.

An advantage of forward extrusion over backward extrusion is: a) Lower pressure. b) Lower force. c) All of the above. d) None of the above.

In a rolling process, if both roller diameters reduce by 25%, then the required power to rotate the rollers would: a) Increase 25%. b) Decrease 25%. c) Increase 50%. d) Decrease 50%.

Which of the following bulk deformation processes are involved in the production of nails for lumber construction? a) Wire drawing, flashless forging, and impression die forging. b) Wire drawing, flashless forging, and rolling. c) Flashless forging, impression die forging, and upsetting. d) Extrusion, flashless forging, and wire drawing

The thickness of each of the two sheets to be resistance spot welded is 3.5 mm. It is desired to form a weld nugget that is 5.5 mm in diameter and 5.0 mm thick after 0.3 sec welding time. The unit melting energy for a certain sheet metal is 9.5 J/mm3 . The electrical resistance between the surfaces is 140 micro ohms, and only one third of the electrical energy generated will be used to form the weld nugget (the rest being dissipated), determine the minimum current level required.

A GTAW operation is performed on low carbon steel, whose unit melting energy is 10.3 J/mm3 . The welding voltage is 22 volts and the current is 135 amps. The heat transfer factor is 0.7 (convection heat loss of 30%) and the melting factor is 0.65 (conduction heat loss of 35%). If filler metal wire of 3.5 mm diameter is added to the operation, the final weld bead is composed of 60% volume of filler and 40% volume base metal. If the travel speed in the operation is 5 mm/sec, determine:

(a) The cross sectional area of the weld bead

(b) The feed rate (mm/sec) at which the filler wire must be supplied.

Expert Solution

samet mamat answered 2 years ago

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