16. what does \fcaw\ stand for?
17. what is the correct arc length for fcaw?
18. why do welders clean mill scale or rust before welding?
19. what is a \stringer bead\?
20. what is amperage?

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Accepted Answer

### Question 16:
# Brief Explanations:
FCAW is an acronym in the field of welding, which falls under Engineering (a subfield of Natural Science). FCAW stands for Flux - Cored Arc Welding. It is a welding process that uses a continuously fed flux - cored electrode.
# Answer:
Flux - Cored Arc Welding

### Question 17:
# Brief Explanations:
In FCAW (Flux - Cored Arc Welding), the correct arc length is typically about 1/8 to 3/8 of an inch (or approximately 3 to 10 millimeters). This range is important as it affects the quality of the weld, including penetration, bead appearance, and the stability of the arc. If the arc length is too short, it can cause the electrode to stick to the workpiece and create a poor - quality weld. If it's too long, the arc becomes unstable, leading to spatter and a weak weld.
# Answer:
Typically about 1/8 to 3/8 of an inch (or 3 - 10 mm)

### Question 18:
# Brief Explanations:
Welders clean mill scale or rust before welding because these substances (mill scale is a layer of iron oxide that forms on the surface of hot - rolled steel, and rust is also an oxide of iron) can prevent proper fusion between the base metal and the weld metal. They can also introduce impurities into the weld, which may lead to defects such as porosity, cracks, and reduced strength of the weld joint. Removing them ensures a clean surface for the weld to adhere to and form a strong, high - quality joint.
# Answer:
To ensure proper fusion, avoid impurities and weld defects, and create a strong weld joint.

### Question 19:
# Brief Explanations:
A "stringer bead" is a type of weld bead in welding (related to Engineering). It is formed when the welding electrode moves in a straight line along the joint without significant side - to - side movement. Stringer beads are often used for thinner materials or when a narrow, single - pass weld is desired. They result in a relatively narrow and uniform weld bead appearance.
# Answer:
A weld bead formed by moving the electrode in a straight line along the joint (no significant side - to - side movement), used for thinner materials or narrow, single - pass welds.

### Question 20:
# Brief Explanations:
Amperage (or current) in the context of welding (and in electrical engineering in general) refers to the measure of the rate of flow of electric charge (in amperes, symbol: A). In welding, the amperage setting on the welding machine controls the amount of current flowing through the electrode and the workpiece. It has a significant impact on the heat input during welding, which in turn affects the penetration of the weld, the size of the weld bead, and the overall welding process. Higher amperage generally means more heat and deeper penetration, while lower amperage means less heat and shallower penetration.
# Answer:
The rate of electric charge flow (measured in amperes), controlling heat input and weld characteristics in welding.

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