418

Question 1

In torch brazing, the filler metal is distributed in the joint as a result of

Answer 1

capillary action

Question 2

The oxyfuel process in which the base metal is not melted and the filler metal is drawn into a thin joint by capillary action is called

Answer 2

brazing

Question 3

When brazing and braze welding, which of the following safety precautions must you observe?

Answer 3

Avold skin contact with the flux

Question 4

The purpose of scarfing is to

Answer 4

remove a surface defect from unfinished steel

Question 5

To make the best possible welds using oxyfuel equipment, you should

Answer 5

know what metals you are joining

Question 6

A special concern when brazing ____ is that the filler metal melts at a temperature very near the melting point of the base metal.

Answer 6

Aluminum

Question 7

Which of the following is a common surfacing material?

Answer 7

Ceramics

Question 8

Soldering differs from brazing in that soldering

Answer 8

Occurs at lower temperatures

Question 9

Which of the following must be worn during an oxygen cutting operation?

Answer 9

Goggles with dark lenses

Question 10

In torch hard facing, the new material melts ______ the surface. In flame spraying, the new material melts _______ the surface

Answer 10

before it reaches; before it reaches

Question 11

When welding aluminum, you need to remember that aluminum

Answer 11

conducts heat away from the weld site rapidly

Question 12

When piercing a steel plate with an oxygen cutting torch, which step should be performed first?

Answer 12

Heat the spot to a bright red

Question 13

When using thermal spraying for shaft repair, which step should be performed first?

Answer 13

Machining

Question 14

The purpose of postheating is to

Answer 14

reduce stresses in the welded structure

Question 15

When you weld low-carbon steel, you should

Answer 15

dip the filler rod into the weld puddle

Question 16

When welding brass, you should use a

Answer 16

Flux

Question 17

The purpose of using a flux in brazing is to

Answer 17

eliminate oxides from the metal surfaces

Question 18

Oxyfuel welding and oxygen cutting are alike in that both processes

Answer 18

require lighting the torch with a sparklighter

Question 19

Electric arc spraying operations require eye protection with a lens shade number of

Answer 19

9 to 12

Question 20

In oxyfuel weiding, you can control the rate of heat input to the base metal by varying the

Answer 20

speed of the torch

Question 21

What kind of flame should be used when welding lead? _____ Nickel?_____ Magnesium? ______

Answer 21

Neutral; Carburizing; Carburizing

Question 22

What is the purpose of hard face welding? _________ What is the purpose of thermal spraying? ______

Answer 22

Rebuild worn areas; Apply a surface coating

Question 23

The purpose of using a flux in welding and brazing is to

Answer 23

clean the base metal

Question 24

If you need to cut a metal other than mild steel or medium-carbon steel, you might make a difficult job easier if you

Answer 24

lay a bead of low-carbon steel along the cut line

Question 25

In preparing aluminum parts for welding, you should _______ the surfaces to be welded.

Answer 25

scrape or file