I need 8 problems solved with the work shown. ThanksDocument Preview:1 1. A welding heat source is capable of transferring 150 Btu/min to the surface of a metal part. (6) The heated area is approximately circular, and the heat intensity decreases with increasing radius as follows: 50% of the power is transferred within a circle of diameter = 0.1 inch and 75% is transferred within a concentric circle of diameter = 0.25 in. What are the power densities in (a) the 0.1-inch diameter inner circle and (b) the 0.25-inch diameter ring that lies around the inner circle? (c) Are these power densities sufficient for melting metal? 2. In a controlled experiment, it takes 3700 J to melt the amount of metal that is in a weld bead (6) with a cross-sectional area of 6.0 mm2 that is 150.0 mm long. (a) Using Table, what is the most likely metal? (b) If the heat transfer factor is 0.85 and the melting factor is 0.55 for a welding process, how much heat must be generated at the welding source to accomplish the weld? [K = 3.33?10-6 ] 2 3. A GTAW operation is performed on low carbon steel, whose unit melting energy is 10.3 J/mm3. (7) The welding voltage is 22 volts and the current is 135 amps. The heat transfer factor is 0.7 and the melting factor is 0.65. 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) cross-sectional area of the weld bead, and (b) the feed rate (mm/sec) at which the filler wire must be supplied. 3 4. An electron-beam welding operation will join two pieces of steel plate together. The plates (6) are 1.00 in thick. The unit melting energy is 125 Btu/in3. The diameter of the work area focus of the beam is 0.060 in, hence the width of the weld will be 0.060 in. The accelerating voltage is 30 kV and the beam current is 35 milliamp. The heat transfer factor is 0.70 and the melting factor is 0.55. If the beam moves at a speed of 50 in/min, will the beam penetrate the full Attachments: manufacturing.pdf