Explain the resistance projection welding process.
What will be an ideal response?
To make a projection weld, projections are formed on at least one of the workpieces at the points where welds are desired. The projections-small, raised areas-can be any shape, such as round, oval, circular, oblong, or diamond. They can be formed by embossing, casting, stamping, or machining.
The workpieces that have the projections and the other workpiece are placed between plain, large-area electrodes in the welding machine. The current is turned on, and pressure is applied. Since nearly all of the resistance is in the projections, most of the heating occurs at the points where welds are desired. The heat causes the projections and the opposing metal to soften. The pressure from the electrodes causes the softened projections to flatten, resulting in fusion of the workpieces.
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What will be an ideal response?
Police dogs that worked at the 2001 New York City World Trade Center disaster included
A. Search and rescue dogs B. USDA Beagle Brigade dogs C. Personal protection dogs D. A and C above E. None of the above
In a series circuit:
A) The resistance stays the same throughout the circuit. B) The voltage stays the same throughout the circuit. C) The wattage stays the same throughout the circuit. D) The current stays the same throughout the circuit.
A gable roof is not as common as other types of roofs used in residential construction.
Answer the following statement true (T) or false (F)