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1 Period Sheet Metal > Materials > Flashcards

Materials Flashcards

1
Q

metal such as,——–,———-,———– can be in their pure form and when they are known as Metallic elements?

A

1.gold
2.sliver
3.copper
4.aluminum

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2
Q

when a metal contains a combination of two or more metals,it is then considered an ———?

A

alloy.

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3
Q

expanded metal it can be used ?

A

for security purposes, saftey guards for moving parts on equipment and machinery.

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4
Q

what is commonly used in the sheet metal trade for sound attenuation.

A

perforated metal.

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5
Q

perforated metal the holes can be ?

A

round , square, hexagonal, oblong, and many others.

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6
Q

hardware cloth or bird screen it comes some common sizes is ?

A

1/4’’ by 1/4
1/2’’ by 1/2’’
1’’ by1’’

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7
Q

hardware cloth used for?

A

extensively to cover openings of hoods and vents prevent the entry of unwanted pests.

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8
Q

what is brittleness?

A

is in a metal is the ability to withstand distortion.

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9
Q

materials such as glass, cast, iron, and very hard steel [files] are considered?

A

brittle.

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10
Q

conductivity may refer to either ?

A

heat conductivity or electrical conductivity.

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11
Q

what is an excellent conductor of both heat and electricity and used extensively as a cable in electrical systems?

A

copper.

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12
Q

what is the ability to withstand stretching ,bending orn twisting past ?

A

ductile.

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13
Q

what is elasticity?

A

the tendency of metal to return to it’s original shape after forces have caused the metal to become deformed.

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14
Q

what is the ability to withstand mechanical processing such as rolling , forging and hammering without cracking or braking ?

A

mealleable

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15
Q

what is strength ?

A

is the amount of high ,steady stress a metal can withstand before it yields.

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16
Q

What is toughness?

A

Is the ability of a metal to withstand an impact load.

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17
Q

Example of tough metal?

A

Titanium.

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18
Q

What is the combination of operations involving the heating and cooling of metal?

A

Heat treatment.

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19
Q

Heat treatment falls into three categories?

A

Annealing
Quenching
Tempering

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20
Q

Annealing is

A

A process used to release internal stresses in hardened metal.

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21
Q

What is that cooling of metal that is heated by immersion in a medium such us water and oil ?

A

Quenching

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22
Q

Tempering is ?

A

The increasing the toughness and decreasing hardness.

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23
Q

Practically all the work that is done to metal in shop is ?

A

Cold work.

24
Q

What is the result of when the metal is exposed to the oxygen in the atmosphere?

A

Oxidation.

25
Q

Stainless steels have the addition of ?

A

Chromium.

26
Q

What is a corresive process that results when dissimilar metals come in contact with an electrolyte such as moisture?

A

Galvanic action.

27
Q

One way to prevent this galvanic action from happening is to provide a barrier between the two metals such barriers include?

A

Strips of lead between the metal
Heavy tinning of the ferrous metal
Good quality
Heavy coat.

28
Q

Ferrous metal or metal using?

A

The us standard gauge.

29
Q

Non ferrous also known as the brown sharpe using?

A

American standard wire gauge.

30
Q

Metals are broken into two basic groups?

A

Ferrous and Non ferrous.

31
Q

Steel is an alloy primarily composed of iron with a carbon content between——— and———— by weight depending on the grade?

A

0.02 percent and
1.7 percent.

32
Q

Black iron may?

A

Either hot rolled or cold rolled.

33
Q

Black iron that measures more than 1/8” is called?

A

Steel plate.

34
Q

When welding zinc coated sheets, ventilation of the zinc oxide fumes is crucial to prevent an illness known as?

A

The zinc chills or metal fume fever.

35
Q

Another disadvantage of zinc coated metal is not to used on any food ?

A

Because the zinc and its compounds are poisonous.

36
Q

What are produced by electroplating zinc onto steel in continuous process?

A

Electrogalvanizing

37
Q

Steel sheets that have zinc added to them electrogalvanzing go by the trade name of ?

A

Satincoat
Paintlock And
Wipecoat.

38
Q

26 gauge sheets of galvanized iron will be thicker than a 26 gauge sheet of black iron?
True or false

A

True

39
Q

Gal alime is zinc aluminum alloy coating with superior corrosion resistance used for?

A

The outer wall B- vent an L-vent chimney and fittings.

40
Q

One of the most common types of stainless steel used in the sheet metal trade is ?

A

304 of the basic 18-8 group which contains 18’/‘ chromium, 8 percent nickel,0.08 percent carbon (max) and the rest of steel

41
Q

Stainless steel comes in various finishes?

A

1 finish - where finish is not important.
2d finish a dull finish.
2B finish plan finish.
4 finish a stain finish on one side used restaurant, kitchen.

42
Q

When working with stainless steel?

A

All work areas should be iron free to prevent contamination and possible corrosion of the metal.

43
Q

Non ferrous metal consists elements are ?

A

Copper, and aluminum or alloys such as brass.

44
Q

Aluminum is obtained from an ore called?

A

Bauxite , which is found mainly the tropics and sub tropics with some deposits in Europe

45
Q

Aluminum is lightweight weighing about ?

A

One theird the weight of steel.

46
Q

To avoid fracturing,aluminum should be bent using a bend radius of ?

A

3 times the material thickness.

47
Q

Aluminum has many uses?

A

Automotive
Aerospace and
Marine industries.

48
Q

Aluminum is gauged in ?

A

Decimal parts of an inch or the brown and sharpe gauge.

49
Q

What is reddish brown metal that is considered an element?

A

Copper

50
Q

What is the advantage of copper?

A

Excellent conductor of heat and electricity.

51
Q

When copper oxidizes it forms a greenish coating that is called?

A

Patina

52
Q

Copper is gauged by weight in ?

A

Ounces per square foot.

53
Q

Brass is?

A

The common name used for all copper zinc alloys.

54
Q

What is the advantage of brasses?

A

Are highly malleable and are easily cast ,forged, rolled and pressed.

55
Q

There are two basic categories of plastics?

A

Thermosetting and
Thermoplastic.

1 Period Sheet Metal (10 decks)

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