Chapter 27 Flashcards
I = current or _________
amperes
cables
- allows both the ground clamp and the stinger to be mobile.
- should also be well insulated and protected from the heat during welding.
coated metal electrode
An arc welding machine joins two metals together by generating an electric arc between a _____________________ and a base metal.
I = amperes or _________
current
electric arc
An arc welding machine joins two metals together by generating an this between a coated metal electrode and a base metal. The heat of this melts the metal which mixes with the molten deposits of the coated electrode.
Electrode holder (or
stinger)
- The stinger receives the amperage and directs it through the electrode to form the arc.
- The electrode holder should be well insulated, have a strong spring to firmly grasp the electrode, and a release lever to exchange the electrodes easily.
generators
Generator powered arc welding machines run on direct current.
These welding machines are commonly used in industry and are noisy, expensive to purchase, and costly to operate.
ground clamp
completes the full electrical circuit so that enough heat will be available for the welding job.
must be securely fastened to the metal being welded or to an adjoining workbench or piece of metal.
pitting
galling
power supply
The power supply of the arc welding apparatus must maintain a relatively constant current with only a slight change in voltage.
rectifiers
a more versatile arc welding power supply that can be run on either direct or alternating current.
Slag
The coating of the electrode produces a gas which shields the weld from the atmosphere and helps to maintain the weld shape. This coating is later removed in the form of _______.
slag hammer
is used to remove slag from the weld for proper cooling.
transformers
These machines are generally the cheapest to purchase and run on an alternating current.
ultraviolet and infrared rays
The brilliant light given off by the electric arc produces invisible __________________________________.
voltage
Varying _______ and current will result in an uneven arc that creates splatters and uneven welds.
wire brush
If a second pass is to be made with the arc, this must be used to remove all slag fragments from the welding area. If not removed, the weld will not be solid and residual stresses will result.
amperes
I = current or _________
- allows both the ground clamp and the stinger to be mobile.
- should also be well insulated and protected from the heat during welding.
cables
An arc welding machine joins two metals together by generating an electric arc between a _____________________ and a base metal.
coated metal electrode
current
I = amperes or _________
An arc welding machine joins two metals together by generating an this between a coated metal electrode and a base metal. The heat of this melts the metal which mixes with the molten deposits of the coated electrode.
electric arc
completes the full electrical circuit so that enough heat will be available for the welding job.
must be securely fastened to the metal being welded or to an adjoining workbench or piece of metal.
ground clamp
galling
pitting
The power supply of the arc welding apparatus must maintain a relatively constant current with only a slight change in voltage.
power supply
a more versatile arc welding power supply that can be run on either direct or alternating current.
rectifiers
The coating of the electrode produces a gas which shields the weld from the atmosphere and helps to maintain the weld shape. This coating is later removed in the form of _______.
Slag
is used to remove slag from the weld for proper cooling.
slag hammer
These machines are generally the cheapest to purchase and run on an alternating current.
transformers
The brilliant light given off by the electric arc produces invisible __________________________________.
ultraviolet and infrared rays
Varying _______ and current will result in an uneven arc that creates splatters and uneven welds.
voltage
If a second pass is to be made with the arc, this must be used to remove all slag fragments from the welding area. If not removed, the weld will not be solid and residual stresses will result.
wire brush
