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Welding-3.1 > General > Flashcards

General Flashcards

1
Q

Slag inclusions may be present in

A

Mma welds

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2
Q

Main cause of undercut

A

Excessive amps

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3
Q

What Characteristic is typical for manual work

A

Constant current

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4
Q

Uk and Us it’s normal practice to measure what in welds

A

Leg lengths

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5
Q

Toes of all welds should be blended too?

A

Increase fatigue life

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6
Q

Silicon is added too steel and covering of electrodes too ?

A

Provide de oxidation

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7
Q

Low hydrogen electrode usually has a what covering

A

Basic

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8
Q

A high hydrogen electrode usually has what covering

A

Cellulosic

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9
Q

Fusible inserts in tig welding help what

A

Root pen

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10
Q

Typical welding angle for mma full pen

A

70°

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11
Q

Which test is used too measure toughness of the parent metal, Haz and the weld metal

A

Charley impact- v notch

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12
Q

Fillet fracture and Nick break are used for assessing

A

Weld quality

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13
Q

Mig/mag has a constant

A

Constant voltage

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14
Q

Fcaw

A

Constant voltage

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15
Q

Saw

A

<1000A flat
Constant Voltage
>1000A
Constant current

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16
Q

Tig has a

A

Dropping constant current

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17
Q

MMA

A

Dropping
Constant current

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18
Q

Mig/mag/fcaw as ctwd increases

A

Amperage decreases

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19
Q

Mig/mag/fcaw as ctwd decreases

A

Amperage increases

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20
Q

MMA/tig voltage reduces as arc

A

Decreases

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21
Q

MMA/tig voltage increases as arc

A

Increases

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22
Q

Non planar defects are

A

Inclusions or porosity

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23
Q

En 288

A

Procedure qualification

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24
Q

Z =

A

Through thickness ductility

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25
Q

Yoke is a term in

A

M.p.i

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26
Q

Element too improve toughness

A

Manganese

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27
Q

111=

A

MMA

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28
Q

131=

A

TIG

29
Q

141=

A

MIG

30
Q

Throat thickness = multiply by

A

1.4

31
Q

Leg length = multiply by

A

0.7

32
Q

Where does the other side symbol go

A

Above the line

33
Q

What is the upper critical temp of changing characteristics

A

723°

34
Q

Heat input calculation is work out by

A

Voltage, current, travel speed, thermal efficiency

35
Q

Residual stresses are the consequence of what

A

Material not yielding

36
Q

Necking is

A

The point of failure

37
Q

Transition range is

A

Temp it can take before it becomes brittle

38
Q

Single sided but joints and root bead pen is mainly influenced by

A

Root gap

39
Q

When Visually inspecting a weld what flaw is considered the most serious

A

Arc strikes

40
Q

Burn through may occur if

A

Voltage is too high

41
Q

Leg length multiply by

A

0.7

42
Q

Throat thickness multiply by

A

1.4

43
Q

The fusion boundary of a fillet weld is

A

Between the weld metal and the haz

44
Q

Bs en 17637 allows magnification of

A

2 too 5x

45
Q

Magnetic forces affecting the arc is known as

A

Arc blow

46
Q

An example of a classified electrode is E 38 3 R

A
47
Q

Max Weave width may be applied too a wps standard for

A

A reduction in haz toughness

48
Q

Lamellar tearing is a crack type that occurs

A

In the parent material due too welding strains acting in a short transverse direction

49
Q

Gas 20% carbon and 80% argon is a

A

Mechanised mag process

50
Q

When welding thin plate - distortion can be minimised by

A

Back step welding

51
Q

What is a penetrameter used for

A

Quality of radiographic technique

52
Q

Typical temp for normalising

A

723°

53
Q

STRA test determine

A

Through thickness ductility

54
Q

Non magnetic steel example

A

18%Cr 8%Ni

55
Q

When arc lenght is shortened in mma the voltage

A

Decreases

56
Q

What process is suitable too welding over 25 MM

A

Spray transfer

57
Q

Crater pipe is a

A

Shrinkage defect

58
Q

A tensile test result of 24% elongation this is a measure of

A

Ductility

59
Q

A bend test is done too determine

A

Freedom from defects

60
Q

The use of pre heat in CMn steels is too primarily too

A

Delay the cooling rate

61
Q

Lowest level of hydrogen process is

A

Tig

62
Q

Solidification cracking happens when

A

Weld metal has a high carbon or impurity (sulphur)

63
Q

Where do hydrogen induced cracks normally form

A

Through the haz

64
Q

Where do solidification cracks normally take place

A

Through the centre of the weld metal

65
Q

Apply pwht too reduce

A

Residual stresses and eliminate susceptible microstructures

66
Q

Basic electrode deposits how much weld metal

A

5ml per 100g

67
Q

Rutile electrodes deposit how much weld metal

A

25/30ml per 100g

68
Q

Cellulosic electrode deposit how much weld metal

A

80/90ml per 100g

Welding-3.1 (4 decks)

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