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A resistance seam-welding operation is performed on two pieces of 2.5-mm-thick austenitic stainless steel to fabricate a container. The weld current in the operation is 10,000 A, the weld duration = 0.3 sec, and the resistance at the interface is 75 micro-V. Continuous motion welding is used, with 200-mmdiameter electrode wheels. The individual weld nuggets formed in this RSEW operation have diameter = 6 mm and thickness = 3 mm (assume the weld nuggets are disc-shaped). These weld nuggets must be contiguous to form a sealed seam. The power unit driving the process requires an off-time between spot welds of 1.0 s. Given these conditions, determine
(a) the unit melting energy of stainless steel using the methods of the previous chapter,
(b) the proportion of energy generated that goes into the formation of each weld nugget, and
(c) the rotational speed of the electrode wheels.
You can produce a parking token by two alternative methods. First, cut a 10 mm diameter billet to a length of 10 mm, and then closed-die forge it to the final size and shape (25 mm diameter). Second, you could start with a sheet of material, and stam..
calculate the number of one-liter gas cylinders required to store 1.0 kg of ethylene gas at room temperature. the gas
1. Briefly explain what determines the characteristic color of (a) a metal and (b) a transparent nonmetal. 2. Briefly explain why some transparent materials appear colored while others are color- less.
the allowable shearing stress is 15ksi in a steel rod ab and 8ksi in a brass rod bc. knowing that a torque of magnitude
Find a 95% confidence interval for the model's slope parameter (β1). What does this confidence interval tell you about the relationship between Y and X for these data?
an air-hockey puck has a mass of 0.01 kg and a diameter of 90 mm. when it is placed on the air table an air film of
Determine the steady-state amplitude of the absorber mass.
Database solutions today must be able to adapt and integrate among various computing applications. Determine at least three forms of database connectivity methods that can be used as an interface between applications. For each method you have c..
Refrigerant 22 enters the valve of a refrigeration system with a pressure of 14 bars and a temperature of 32 C and exits at a pressure of 4 bars. Neglecting heat transfer and any changes in potential and kinetic energy, determine the quality of the r..
Coal discharged from a dump truck with an initial velocity (v)= 1.8m/s at 50 degrees falls on conveyor belt B. Determine the required velocity v(B) of the belt if the relative velocity with which the coal hits the belt is to be vertical.
An air-standard dual cycle has a compression ratio of 18.2 and a cut off ratio of 1.31. The pressure ratio during constant volume heat addition process is 1.5. At the beginning of the compression, P1=80 kPa, T1 = 20°C at the beginning of the cycle. U..
A new cylindrical tank is being designed for SeaWorld, where the 3m high Plexiglass wall will be supported using I-beams spaced 2m apart. The beams are to be constructed from 13mm steel plate (t=b) having a yield strength of 250MPa. This design shoul..
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