Explain why the heat of the arc, which is much higher than the melting point of tungsten, does not actually melt the tungsten electrode.
What will be an ideal response?
The thermal conductivity of tungsten and the heat input are prime factors in the use of tungsten as an electrode. In general, tungsten is a good conductor of heat. This conductive property is what allows the tungsten electrode to withstand the arc temperature well above its melting temperature. The heat of the arc is conducted away from the electrode's end so fast that it does not reach its melting temperature. For example, a wooden match burns at approximately 3000°F (1647°C). Because aluminum melts at 1220°F (971°C), a match should easily melt an aluminum wire. However, a match will not even melt a 1/16-in. (2-mm) aluminum wire. The aluminum, like a tungsten electrode, conducts the heat away so quickly that it will not melt.
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Answer the following statement true (T) or false (F)
Refrigeration can be described as ____.
A. the process of making products cold B. the process of introducing heat to a location where it is not wanted C. the process of removing heat from a place where it is not wanted to a place where it makes little or no difference D. None of the above.
What is an alloy made for?
What will be an ideal response?
Motor starting components can be made up of:
A) Starting and running capacitors only. B) Internal and external centrifugal switches only. C) Internal centrifugal switches, relays, starting, and running capacitors. D) Toggle switches, external centrifugal switches, and relays.