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EME50 > Joining > Flashcards

Joining Flashcards

1
Q

Reasons for joining

A

Uneconomical/impossible to manufacture in one piece
Less cost to join together, including transportation of parts
Product may need to be taken apart for maintenance etc

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2
Q

Oxyfuel gas welding

A

Flame produced using fuel gas and oxygen
Filler used to provide extra material at weld zone
Flux generates gas shield around weld zone to prevent oxidation

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3
Q

Thermite welding

A

Metal melted by an oxidation reaction (usually iron power reacting with aluminum oxide)

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4
Q

Friction welding

A

Workpieces joined through inertial, linear, or stir friction

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5
Q

Arc welding

A

Heat generated by electrode arcing to workpiece

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6
Q

Shielded metal arc welding (SMAW/stick welding)

A

Oldest and simplest welding method
Flux-coated electrode hand-fed towards piece
Good for remote work and thicker materials

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7
Q

Gas metal arc welding (GMAW/MIG)

A

External source of gas shields weld to prevent oxidation (no flux)
Can be automated, electrode fed via “glue gun”

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8
Q

Flux-core arc welding

A

Similar to MIG but electrode is flux rod coated in filler metal

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9
Q

Gas tungsten arc welding (GTAW/TIG)

A

Gas is fed around reusable tungsten electrode
Filler metal is hand-fed towards weld area
Good for precise welds on thin materials

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10
Q

What is the weakest point of a weld?

A

The area right next to the weld zone, also called the heat-affected area

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11
Q

Plasma arc welding (PAW)

A

Plasma is concentrated at weld area
Filler is hand-fed like TIG
Good for precise welds

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12
Q

Electron beam welding (EBW)

A

Fast, concentrated beam of electrons used as heat source
Must be done in near vacuum

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13
Q

Laser beam welding (LBW)

A

Laser is used as heat source

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14
Q

What kinds of welding are used in space?

A

Induction and laser welding

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15
Q

Induction welding

A

Heat generated through resistance created on conductive, magnetic workpiece

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16
Q

Resistance welding

A

Heat is supplied by electrical resistance between two members
No electrodes, shielding gas, or flux

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17
Q

Zones of a fusion welded joint

A

Base metal
Heat-affected zone
Fusion zone

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18
Q

Weld defects

A

Porosity
Slag inclusions
Incomplete fusion
Incomplete penetration
Weld profile
Underfilling
Undercutting
Overlap
Cracks
Distortion

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19
Q

Cold welding

A

Dies/rolls apply pressure to mating interfaces
Uses plastic deformation to join surfaces

20
Q

Ultrasonic welding

A

Static force and oscillating shears applied to mating surfaces

21
Q

Diffusion bonding welding

A

Creates strong joints that maintain the properties of the base material

22
Q

Explosion welding

A

Layered explosives create high-pressure
Causes mechanical interlocking of the surfaces
Useful for large plates of dissimilar metals

23
Q

Brazing

A

Filler metal is melted between mating surfaces but the surfaces themselves remain solid

24
Q

Soldering

A

Similar to brazing but at lower temperatures
Results in weaker joints
Filler/flux can be in paste form

25
Q

Adhesive advantages

A

Load distribution is even, no localized stresses
Thin/fragile components and porous materials w/ different sizes/properties can be bonded
Does not reach very high temps

26
Q

Adhesive disadvantages

A

Can be time-consuming
Surface preparation is critical
Hard to test nondestructively, reliability can be a concern

27
Q

Riveting

A

Permanent/semipermanent joint created by deforming rivet into hole

28
Q

Stapling/Clinching/Stitching

A

Very fast
Good for thin materials

29
Q

Seaming

A

Two thin pieces folded together

30
Q

Crimping

A

Done with tubular/flat parts
Squishes things into place

31
Q

Snap-in fasteners

A

Cheap
Easy
Good for rapid assembly and disassembly

32
Q

Advantages of mechanical fastening

A

Easy disassembly
Can allow for movable/adjustable joints
Cheaper

33
Q

To create a brazed joint of the same strength as a similar welded joint a larger ____ is required.

A

weld area

34
Q

Welding techniques for dissimilar materials

A

TIG
MIG

35
Q

Filler rod characteristics for dissimilar materials

A

Strength of weaker metal
Melting point between materials

36
Q

Don’t weld these material combinations

A

Titanium and steel
Aluminum and copper
Aluminum and stainless steel

37
Q

Aluminum welding processes

A

TIG
MIG

38
Q

Cast iron welding processes

A

Stick
Note: must pretreat before welding

39
Q

Copper, brass, and alloys welding processes

A

TIG

40
Q

Stainless steel welding processes

A

TIG
MIG
Stick

41
Q

Steel welding processes

A

Any

42
Q

Nickel welding processes

A

TIG

43
Q

Titanium welding processes

A

TIG
Laser

44
Q

Magnesium welding processes

A

Laser
Friction stir
Resistance spot

45
Q

Thermoplastic welding processes

A

Hot gas
Ultrasonic

EME50 (9 decks)

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