Chapter 27

Question 1

I = current or _________

Answer 1

amperes

Question 2

cables

Answer 2

• allows both the ground clamp and the stinger to be mobile.
• should also be well insulated and protected from the heat during welding.

Question 3

coated metal electrode

Answer 3

An arc welding machine joins two metals together by generating an electric arc between a _____________________ and a base metal.

Question 4

I = amperes or _________

Answer 4

current

Question 5

electric arc

Answer 5

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.

Question 6

Electrode holder (or
stinger)

Answer 6

• 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.

Question 7

generators

Answer 7

 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.

Question 8

ground clamp

Answer 8

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.

Question 9

pitting

Answer 9

galling

Question 10

power supply

Answer 10

The power supply of the arc welding apparatus must maintain a relatively constant current with only a slight change in voltage.

Question 11

rectifiers

Answer 11

a more versatile arc welding power supply that can be run on either direct or alternating current.

Question 12

Slag

Answer 12

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 _______.

Question 13

slag hammer

Answer 13

is used to remove slag from the weld for proper cooling.

Question 14

transformers

Answer 14

These machines are generally the cheapest to purchase and run on an alternating current.

Question 15

ultraviolet and infrared rays

Answer 15

The brilliant light given off by the electric arc produces invisible __________________________________.

Question 16

voltage

Answer 16

Varying _______ and current will result in an uneven arc that creates splatters and uneven welds.

Question 17

wire brush

Answer 17

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.

Question 18

amperes

Answer 18

I = current or _________

Question 19

• allows both the ground clamp and the stinger to be mobile.
• should also be well insulated and protected from the heat during welding.

Answer 19

cables

Question 20

An arc welding machine joins two metals together by generating an electric arc between a _____________________ and a base metal.

Answer 20

coated metal electrode

Question 21

current

Answer 21

I = amperes or _________

Question 22

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.

Answer 22

electric arc

Question 23

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.

Answer 23

ground clamp

Question 24

galling

Answer 24

pitting

Question 25

The power supply of the arc welding apparatus must maintain a relatively constant current with only a slight change in voltage.

Answer 25

power supply

Question 26

a more versatile arc welding power supply that can be run on either direct or alternating current.

Answer 26

rectifiers

Question 27

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 _______.

Answer 27

Slag

Question 28

is used to remove slag from the weld for proper cooling.

Answer 28

slag hammer

Question 29

These machines are generally the cheapest to purchase and run on an alternating current.

Answer 29

transformers

Question 30

The brilliant light given off by the electric arc produces invisible __________________________________.

Answer 30

ultraviolet and infrared rays

Question 31

Varying _______ and current will result in an uneven arc that creates splatters and uneven welds.

Answer 31

voltage

Question 32

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.

Answer 32

wire brush