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Welding > week 1 > Flashcards

week 1 Flashcards

1
Q

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

A

Alloy

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2
Q

What element determines the basic properties of steel?

A

Iron

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3
Q

Stainless steels are defined by the presence of

A

Chromium

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4
Q

The ability of a metal to resist penetration is called

A

Hardness

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5
Q

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

A

Ductility

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6
Q

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

A

Ferrous metals

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7
Q

What does metal do when its heated

A

Expands

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8
Q

List the different ways to identify a metal bar

A

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

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9
Q

Name the five basic weld joints

A

Butt, corner, lap, tee, edge

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10
Q

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

A

The base metal is not melted

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11
Q

Which of the following are distinguishing features of a carburizing flame

A

Two inner flame cones and an outer blue envelope

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12
Q

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

A

Carburizing, neutral, oxidizing

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13
Q

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

A

Fusion welding

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14
Q

To safely move a pressurized cylinder short distances it can be

A

placed on a cylinder cart designed for this purpose

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15
Q

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

A

flashback

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16
Q

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

A

inclusions

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17
Q

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

A

galvanized

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18
Q

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

A

ferrous metals

19
Q

When storing oxygen and acetylene cylinders they can

A

not be stored together at all

20
Q

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

A

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

21
Q

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

A

false

22
Q

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

A

true

23
Q

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

A

true

24
Q

when installing a regulator on a gas cylinder cracking means

A

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

25
Q

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

A

true

26
Q

acetylene fittings have special right hand threads

A

false

27
Q

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

A

false

28
Q

quenching is the process of cooling metal slowly

A

false

29
Q

an edge point is considered on of the strongest welded joints

A

false

30
Q

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

A

false

31
Q

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

A

True

32
Q

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

A

false

33
Q

what is the basic principle of oxygen-acetylene flame cutting

A

a chemical reaction process called oxidation aided by heat

34
Q

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

A

toe

35
Q

oxygen with a regulator can be use in or with

A

none of the above

36
Q

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

A

all of the above

37
Q

low carbon steel is harder that high-carbon steel

A

false

38
Q

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

A

base metal

39
Q

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

A

600+ BHN

40
Q

Welding equipment should be operated in a well ___ area

A

ventilated

41
Q

how is density of a metal measure

A

weight

42
Q

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

A

cutting speed is to slow

43
Q

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

A

oxygen

44
Q

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

A

5

Welding (2 decks)

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