Explain how electron beam welding works.
What will be an ideal response?
Electron beam welding utilizes the energy from a fast moving beam of electrons focused on the base material. The electrons strike the metal surface, giving up their kinetic energy almost completely in the form of heat. Welds are made in a vacuum (10-3 mm Hg to 10-5 mm Hg), which practically eliminates contamination of the weld material by the gases left in the vacuum chamber. The high vacuum is necessary to produce and focus a stable, uniform electron beam. Welds produced by this process are coalesced from vacuum-melted material, which eliminates the usual fusion weld contaminants caused by water vapor, oxygen, nitrogen, hydrogen, and slag.
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Explain the difference between short-term and long-term driver expectancy, and provide an example of each.
What will be an ideal response?
A welding joint in which one flat part lies on top of another is a:
A. Butt joint B. Lap joint C. Edge joint
When an irregular shape is to be shown in a pictorial drawing, an ______________is the best.
A. isometric drawing B. orthographic drawing C. elevations D. section drawing
To prevent disease, proper disposal of _______ is essential.
Fill in the blank(s) with the appropriate word(s).