A simple square wave follows a pattern similar to that of a sine wave, a series of alternating high and low voltages. The difference is that a sine wave’s magnitude changes continuously, whereas a square wave’s magnitude switches instantaneously between its maximum voltage and zero volts. A square wave is useful for many welding applications.
The economics of worker retention - by Dan Davis It's not unusual for a metal fabricating worker to leave one company and go to work for another for a small increase in pay. This, however, may not be in the best interest of the worker, and it sure hurts the company that loses quality talent.
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