week 1

Question 1

What do we call a mixture of two or more elements in a metal?

Answer 1

Alloy

Question 2

What element determines the basic properties of steel?

Answer 2

Iron

Question 3

Stainless steels are defined by the presence of

Answer 3

Chromium

Question 4

The ability of a metal to resist penetration is called

Answer 4

Hardness

Question 5

The ability of a metal to be stretched into thin wire is called

Answer 5

Ductility

Question 6

ATSM specification for steel products starts with the letter “A” means what

Answer 6

Ferrous metals

Question 7

What does metal do when its heated

Answer 7

Expands

Question 8

List the different ways to identify a metal bar

Answer 8

Appearance test, hardness test, magnetic test, chisel test, fracture test, flame or torch test, spark test

Question 9

Name the five basic weld joints

Answer 9

Butt, corner, lap, tee, edge

Question 10

One of the major differences between gas fusion welding and brazing is, that in brazing

Answer 10

The base metal is not melted

Question 11

Which of the following are distinguishing features of a carburizing flame

Answer 11

Two inner flame cones and an outer blue envelope

Question 12

identify the oxygen-acetylene flame in order from the coldest temperature to the hottest temperature

Answer 12

Carburizing, neutral, oxidizing

Question 13

when the edges of two pieces of metal are heated until they flow together it is called

Answer 13

Fusion welding

Question 14

To safely move a pressurized cylinder short distances it can be

Answer 14

placed on a cylinder cart designed for this purpose

Question 15

What serious condition is indicated when a torch emits a loud and shrill squeal or hissing sound

Answer 15

flashback

Question 16

what are bits of slag, flux, oxides, or dirt trapped inside a weld called

Answer 16

inclusions

Question 17

when torch welding, what metal would produce the most hazardous fumes

Answer 17

galvanized

Question 18

to what group of metals is oxygen - acetylene cutting confined to

Answer 18

ferrous metals

Question 19

When storing oxygen and acetylene cylinders they can

Answer 19

not be stored together at all

Question 20

if you believe that you have a problem with an oxygen regulator you

Answer 20

should replace it or have it repaired by a qualified repair person

Question 21

The thicker the metal the smaller the tip orifice required for welding

Answer 21

false

Question 22

Use of grease or oil on an oxygen - acetylene unit can cause an explosion

Answer 22

true

Question 23

the higher the carbon content in steel the lower the melting point

Answer 23

true

Question 24

when installing a regulator on a gas cylinder cracking means

Answer 24

opening the valve on the cylinder slightly then closing before installing regulator

Question 25

in a welding shop you should assume that all work and or tools are hot

Answer 25

true

Question 26

acetylene fittings have special right hand threads

Answer 26

false

Question 27

you may use a flame to check for leaks on a regulator and hoses

Answer 27

false

Question 28

quenching is the process of cooling metal slowly

Answer 28

false

Question 29

an edge point is considered on of the strongest welded joints

Answer 29

false

Question 30

the standards for proper ventilation for welding areas are set by cal fed

Answer 30

false

Question 31

the cooling rate of metal is a factor in heat treatment of steel

Answer 31

True

Question 32

the last two numbers of the AISI number system for steels indicate chemical properties

Answer 32

false

Question 33

what is the basic principle of oxygen-acetylene flame cutting

Answer 33

a chemical reaction process called oxidation aided by heat

Question 34

The point where the weld face meets the base metal is called the

Answer 34

toe

Question 35

oxygen with a regulator can be use in or with

Answer 35

none of the above

Question 36

in any oxygen-acetylene cutting operation one of the major safety hazards is the

Answer 36

all of the above

Question 37

low carbon steel is harder that high-carbon steel

Answer 37

false

Question 38

The metallurgical composition of the filler and the ___ ___ should be close to the same metals

Answer 38

base metal

Question 39

a metal that is harder than a file has a Brinell hardness number of what

Answer 39

600+ BHN

Question 40

Welding equipment should be operated in a well ___ area

Answer 40

ventilated

Question 41

how is density of a metal measure

Answer 41

weight

Question 42

When oxygen-acetylene cutting is performed excessive slag is a indication of

Answer 42

cutting speed is to slow

Question 43

the cutting action takes place when ___ comes in contact with the red molten metal

Answer 43

oxygen

Question 44

what shade lens is used for oxygen-acetylene welding of mild steel

Answer 44

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