7.8 Riveting

Question 1

What is the most common countersunk angle

Answer 1

100 degrees

Question 2

What are different rivet sizes available in

Answer 2

1/16 increments

Question 3

What is the most common material for a rivet

Answer 3

Aluminium alloy

Question 4

What is likewise for 2017D and 2024DD rivets

Answer 4

They need to be heat treated before use

Question 5

What are the two phases of heat treating

Answer 5

Heating and soaking
Quenching

Question 6

How long should the action of taking the rivet out of the oven and into the quench take

Answer 6

No more than 15 seconds

Question 7

What must you do with a heat treated rivet to prevent its natural age hardening process if not uses straight away

Answer 7

Freeze them

Question 8

At -18 degree C how long can you keep the rivets in a freezer for

Answer 8

7 days

Question 9

At -20 degree C how long can you keep the rivets in a freezer for

Answer 9

20 days

Question 10

How many heat treatment cycles are allowed in the same rivet

Answer 10

No more than 2

Question 11

Need to get m6 rivet AD DD etc

Question 12

What is a rivet pitch

Answer 12

From the centre of one fastener hole to the centre of the next fastener hole in a row

Question 13

What is the edge margin/land edge distance

Answer 13

The distance from the centre of the fastener hole to the nearest edge of a sheet

Question 14

What is the edge margin used for

Answer 14

To guide for the installation of fastener holes along the edge of the material.

(Rule of thumb is 2D to 2.5D times the diameter of the rivet)

Question 15

What is spacing

Answer 15

The distance between fastener rows, taken from the hole centres.

(Rule of thumb - 4 to 5D)

Question 16

What is it meant by the sphere of influence

Answer 16

The area of sheet metal over which a rivet will achieve a water tight joint.

Question 17

What is it meant by the allowance

Answer 17

The amount of protrusion of the rivet shank that is sufficient to form the shop head (tail)

Question 18

How do you prevent skin plates buckling

Answer 18

The maximum rivet spacing of a pressurised rivet is 6D or 18t(whichever is smaller)

Question 19

What is the maximum spacing on a wing structure

Answer 19

3.75D (solid rivet ) or 4.5D(10t) for a hi-lok rivet

Question 20

Why do we dimple skins

Answer 20

If the skin is too thin to countersink

Question 21

What is dimpling

Answer 21

The skin is shaped (dented) to accept the head of the countersunk rivet

Question 22

What are the three different methods of dimpling

Answer 22

Coin dimpling
Radius dimpling
Hot dimpling

Question 23

What are the three ways that you can solid rivet

Answer 23

Pneumatic gun
Hand hammer
Continuous squeeze riveting

Question 24

What is coin dimpling

Answer 24

A male die fits through a rivet hole and the coining ram in the female exerts a controlled pressure on the underside of the hole whilst the male is forced into the upper side.
This gives the hole sharply-defined edges. The top and bottom of the dimple are formed to a 100° angle, enabling dimpled skins to be stacked (or nested).

Question 25

What is radius dimpling

Answer 25

The pilot on the male die passes through the hole and presses into the female die. The dimple formed does not have parallel sides as the lower side has an angle greater than 100°, therefore these dimples cannot be nested.

Question 26

What type of dimpling is better for tight locations

Answer 26

Radius dimpling Because the equipment is smaller

Question 27

What is hot dimpling

Answer 27

To prevent this cracking, the material is heated during the process. The equipment is similar to other ways expect the die is heated

Question 28

What materials require hot dimpling

Answer 28

Magnesium and some of the harder aluminium alloys (such as 7075) cannot be successfully cold-dimpled, as the material is so brittle that cracks will form during the process.

Question 29

What prince of equipment do you use with a rivet gun for reaction riveting

Answer 29

Back up dolly or a bucking bar

Question 30

What is another word for hand riveting

Answer 30

Percussion riveting

Question 31

Why when hand riveting do you want to do a minimal blows as possible

Answer 31

Because If you do a lot then you might work harden the rivet

Question 32

What is the preferred method of riveting

Answer 32

Squeezing method

Question 33

What is the squeezing rivet method

Answer 33

Makes the upset head in a single continuous action. A viable in hydraulic or pneumatic

Question 34

When using a mircrostop countersink tool what must you prevent it from doing

Answer 34

Rotating else it may cause surface damage

Question 35

What are the optimum and maximum timing to form an upset head

Answer 35

3-4 seconds optimum time 7 seconds maximum

Question 36

What tool can be used to flush countersunk rivets down by shaving them

Answer 36

A mircroshaver

Question 37

Cracks in certain rivet heads are not allowed - what material is this

Answer 37

Monel and titanium

Question 38

What is the main source of structural fatigue and failure

Answer 38

Fastener holes

Question 39

What is grip length

Answer 39

When determining the length of a fastener for installation, the combined thickness of the material to be joined must be known. This is the grip length

Question 40

How do you work out the grip length

Answer 40

You use a grip length - put the grip scale in the hole -hook the gauge onto the rear face of the material - then read the material thickness on the front of the gauge

Question 41

What is a Jo-bolt

Answer 41

A high tensile steel blind rivet which is installed with a ratchet hand tool

Question 42

What is another way to describe the installation of a jo bolt

Answer 42

To set it

Question 43

When using a Jo bolt do you have to mill down the excess to make it flush

Answer 43

No, with a jo built the bolt breaks at the waisted part when at a set torque. The spring loaded plumber in the tool ejects the unwanted bit.

Question 44

Which way is the torque for a jo bolt applied

Answer 44

In a counter clockwise direction

Question 45

How do you remove a jo bolt

Answer 45

By a drill

Question 46

What does an additional drive nut on a flush fastener head allow

Answer 46

Have small recesses to allow seating torque to be checked in installed fasteners

Question 47

How does visu lok II prevent FOD

Answer 47

The drive nut stays on the discarded pintail after installation (Also steel nut is magnetic so easier retrieval)

Question 48

What are the two parts of a hi-lok and hi-lite fastener

Answer 48

- A threaded pin with a head (universal or countersunk) - A collar with an internal thread and an external groove

Question 49

What process is use to harden solid rivets after solution heat treatment

Answer 49

Age hardening

Question 50

Solid rivets may be solution treated as many time to save wasting them - true or false

Answer 50

False only twice

Question 51

What angle countersinks are available and which is the most common

Answer 51

82,100, 120 Most common 100

Question 52

Which rivets require heat treatment and how many times can they be treated?

Answer 52

2017 D-, 2024 DD- and 7050 E are brittle and hard so need heat treating One further cook is allowed before installation but after that rivets have to be discarded

Question 53

If rivets are not used after heat treatment how long can they be kept for and how can this be extended

Question 54

What dimpling process provides sharply defined edges

Answer 54

Coin dimpling, allows for stacking or nesting of skins

Question 55

How is depth adjusted on a microstop countersink tool

Answer 55

By pulling the sleeve back and turning the stop to increase or declares the cut. Then dropped back into its original position.

Question 56

Is cracking around the tail of an AD rivet acceptable when installing solid rivets

Answer 56

No, but is allowed with 2017 and 2024 rivets within limits of SRM

Question 57

Are cracks in the head of a Monel and titanium rivet permitted

Answer 57

No.

Question 58

What is an advantage of a hi- lite

Answer 58

Reduced weight, shorter

Question 59

Where do you use cherrymax rivets

Answer 59

High vibration areas

Question 60

Where do you use cherry lock rivets

Answer 60

Both thick and thin job items

Question 61

Before you install a blind rivet what hole prep must you do

Answer 61

Clean No burrs Not damaged

Question 62

What hole prep must you do before inserting a blind rivet

Answer 62

Clean No burrs Not damaged