NDT methods/weld defects Flashcards Preview

Welding Week 4 > NDT methods/weld defects > Flashcards

Flashcards in NDT methods/weld defects Deck (50)
Loading flashcards...
1

Inspection, testing and qualification are growing part of _______ in manufacturing and maintenance.

quality control

2

The ______ is the person who begins quality control by being satisfied only with quality welding.

welder

3

The welder starts the inspection in the process of welding, making immediate adjustment in response to what is being observed in the ______.

weld pool

4

Factors that affect quality of weld bead include....

Changing amperage, travel speed, or arc length

5

Finally, the welder give the completed weld a final _____ to look for any defects that could not be seen while welding.

visual inspection

6

What are the common methods used in NDE?

VT, MT, Liquid Dye PT, UT, LT (air/water pressure testing)

7

What is VT?

Visual inspection, a NDT process, examination with the eye. Only able to detect surface discontinuities.

8

What is the advantage of VT?

Inexpensive equipment and wage, no power required, portable

9

What is the disadvantage of VT?

requires training/experience, good eye sight, can't detect subsurface defects, no permanent records, human error

10

What are the 5 steps of VT?

1. Definite procedure
2. Inspection prior to welding
3. Inspection during welding
4. Inspection after welding
5. Mark/make repairs

11

What are the 7 VT equipment for welding?

Flashlight, magnifying glass, protective lenses, weld gage, hammer/chisel, temperature indicating devices, magnet

12

What is inspected with VT before welding?

Drawing, position of welds, welding symbols, welding procedure

Specifically paying attention to root face, root gap, bevel angle, and joint/fitup

13

Proper ____ will prevent discontinuities from occurring.

Fit up

14

______ will be used to slow the cooling rate and prevent distortion.

Pre-heat

15

What is inspected with VT during welding?

Electrodes, root pass, subsequent passes, crater formation, weld size/sequence

16

What is inspected with VT after welding?

Compare weld to standard, weld size, contour/finish, cracks, overlap, undercut, spatter

17

Testing companies provide an important service because they _____

help manufacturers produce safe and durable goods/structures that consumers can live with.

18

What are two methods of testing?

Non-destructive and destructive

19

What are the 4 common NDT methods?

MT, PT, UT, RT

20

What are the 6 steps of PT?

1 .surface prep
2. penetrant application
3. excess penetrant removal
4. developer application
5. inspection/ evaluation
6. post cleaning

21

If dye color of defect is deep and not never red, defect is ______.

shallow

22

What is referred to as magnaflux?

MT

23

Magnetic particle test begins when _____ electric charges is passed between two poles. Force line up until there is a break in these magnetic lines of force.

Direct Current (DC)

24

In MT, defects appear as a ___ in the lines of force.

break

25

The magnetic particles become attracted to the defect, which develops ______ at the edge of the defect, outlining the defect.

north and south poles

26

What defects are detected with MT?

surface discontinuities, cracks, porosity, slag inclusions, incomplete fusion

27

What are the disadvantage of MT?

Magnetic materials only, surface roughness may distort field, no permanent record

28

To enable the formation of a proper magnetic particle pattern for defect indications, the _____ of the defect and magnetic field must be taken into account.

orientation

29

What are the 2 methods of magnetizing the weld zone?

Yoke method, prode method

30

What does the yoke method use?

An electromagnet