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CWB Welding Inspector Level 2, Chapter 2 Exam
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CWB Welding Inspector Level 2, Chapter 2 Exam 2024-2025Conductors, insulators, semiconductors and gases
What are the four classifications of materials in regarding their ability to conduct
electricity
Insulators
_____ do not readily conduct electrical current because they do not have free electrons
available.
semiconductor
_______ materials don't conduct electricity easily, but neither are they good insulators.
Diode
What is a simple example of a semiconductor?
Ionization
the process of stripping electrons from the atoms of a gas
Positive
What kind of charge does an ion possess?
Free electrons
What is carried by the movement of free electrons in matter?
Ionization potential
Energy necessary for removal of an electron from an atom; also referred to as
ionization.
Low ionization potential
,In metal arc processes, ___ ________ _______ additives are added in fluxes and coatings
to promote arc start and to yield improved arc stability.
Higher melting rate
What does an increase in current in of any welding process result in in the electrode?
u shaped
drive rolls used for aluminum or other soft wires in GMAW
V shaped
Drive rolls used for carbon and stainless steels in GMAW
Background amperage
The baseline level of current set to maintain the arc during low side of a pulse pattern
ohm's law
V=IR
voltage drop
As tip-to-work distance increases in GMAW, which of the following occurs in the the
electrode extension and ultimately reduces the actual voltage available for the arc? (The
power source is constant voltage)
increased voltage
As manually manipulated arc length increases in SMAW, what happens to the welding
circuit? (The power source is constant current)
Ballast resistance
When a resistance is added to a circuit to create a drooping characteristic, it is
sometimes called a ____ ____.
, long enough to be
short enough for good heat concentration, not so short as to short circuit
Optimal arc length
engine driven DC generator
These are the advantages of what type of power source?
Smooth DC rippled output
Voltage droop can be controlled
Portable
Transformer
What type of power source is deigned to increase or decrease voltage?
DC generator, rotating field alternator, brushless alternator
What are the 3 types of engine driven power source
Inductor
A coil of wire hat creates a magnetic field when current passes through it
Transformer Rectifier
An power source that uses diodes to rectify AC current waves to provide DC current
rectifier bridge
A series of 4 (single phase) or 6 (three phase) diodes used to rectify AC current waves
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