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3rd Year Welding > 3rd Metalurgy > Flashcards

3rd Metalurgy Flashcards

1
Q

What type of stainless steel contains the most nickle

A

Austenitic

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2
Q

Which 2 alloying elements in martensitic stainless steels are responsible for its high hardenability

A

Carbon and chromium

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3
Q

Ansi 200 and 300 series stainless steel are

A

Austenitic

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4
Q

What series of stainless steels can be either ferritic or martensitic

A

400 series

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5
Q

Stainless smaw rod with suffix 15 polarity

A

Used with dcrp only

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6
Q

Coating on e308-16

A

Titanic for use with ac

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7
Q

How should you store stainless rods when removed from thier sealed packaging

A

In a heated rod oven

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8
Q

For stainless What should you do to ensure a high quality weld joint

A

Remove moisture by heating with dry air

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9
Q

2×× stainless steel :
Type,
Alloy elements
Hardenable

A

Austenitic
Chromium, nickle, manganese
Non hardenable

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10
Q

3xx stainless
Type
Alloys
Hardenable

A

Austenitic
Chromium, nickle
Non hardenable

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11
Q

4×× stainless steel
Type
Alloys
Hardenable

A

Ferritic or martensitic
Chromium chromium
Non hardenable hardenable

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12
Q

5xx stainless steel
Type
Alloys
Hardenable

A

Martensitic
Chromium
Air hardenable

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13
Q

E Ni Cu -7 is for

A

E :electrode
Ni: nickle
Cu: other chemicals
-7 : separate one composition from another within a group

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14
Q

2 advantages of nickle and its alloys

A

1) excellent corrosion resistance especially at high temps
2) increase in equipment service life

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15
Q

What mechanical effects does alloying nickle, upto 4 %, have on steel

A

Increase strength by 6000psi per percent and low temp impact properties

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16
Q

5 types of metals used for cryogenic applications

A
  • copper
  • aluminum
  • monel
  • 300 series stainless
  • 9% nickle steel
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17
Q

Smaw arc length on most nickle alloys

A

Short

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18
Q

What thickness range is most often welded with clad alloy filler metal

A

1/2 “ or less

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19
Q

Is the same as grain growth

A

Crystal

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20
Q

These are ___ ____ and are a source of

A

-Grain boundries
-weakness

21
Q

A dendrite is

A

A tree like branching structure made frome molten metals solidifying

22
Q

Def alloy:

A

An engineering material with metallic properties containing 2 or more elements, at least 1 must be a metal

23
Q

This is a

A

Body centered cubic structure.
BCC, 8 atoms on tho outside and 1 in the center

24
Q

This is a

A

Face centered cubic structure
FCC, no atoms in dead center, only center of all 6 sides

25
Q

This is a

A

Body centered tetragonal
BCT
Very hard/brittle. From cooling to fast

26
Q

Allotrophy def:

A

The ability of a material to exist in 2 or more atomic forms without any change in atomic composition
Ie iron BCC to FCC at high temp and back to BCC when cooled

27
Q

Ferrite is:

A

Softest structure of iron

28
Q

Cementite def:

A

A hard and brittle compound of iron and carbon, a component of pearlite

29
Q

Curie point def:

A

When it becomes non magnetic, about 1415 degrees f

30
Q

Difference between annealing and normalizing?

A

Annealing is cooling in a furnace
Normalizing is in still air with a finer grain structure

31
Q

Steel is made of

A
  • iron
  • carbon
    (Also
  • manganese
  • silicon)
32
Q

Arc strikes can cause

A

Cracking

33
Q

The higher the carbon content the ____ to weld

A

Harder

34
Q

Max carbon content for pipe/pressure vessels

A

.35

35
Q

Def crystal

A

The symmetrical arrangement of atoms in s solid. With metals its the grain structure

36
Q

An element def:

A

A pure substance that can’t break down into other substances

37
Q

Lower critical temp of steel

A

1333

38
Q

Upper critical range?
Why a range?

A

1333 - 2000
- because of the percentage of carbon

39
Q

Martensite is formed when

A

Steel heats above upper critical then is quenched

40
Q

Why do you preheat some metals

A

It prevents rapid cooling, specially on thick sections

41
Q

Which holds more carbon FCC or BCC

A

FCC

42
Q

How much carbon can a BCC lattice contain

A

. 025 %

43
Q

Metallurgy :Why is a multiples weld better

A

Each pass refines the grains to be finer

44
Q

Perlite consists of alternating layers of

A

Ferrite and cementite

45
Q

What grain structure does low carbon steel have if it cools slowly

A

Ferrite and pearlite

46
Q

Standard charpy impact sample size

A

10 x10 x55 mm

47
Q

Impact tester force

A

300 ft/lbs (400 joules)

48
Q

100 % brittle appearance

A

Light crystalline appearance

49
Q

100 % ductile appearance

A

Darker , fibrous

3rd Year Welding (6 decks)

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