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Second Year Welding > Smaw Fillet Welds On Mild Steel > Flashcards

Smaw Fillet Welds On Mild Steel Flashcards

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Welding Inspection Basics flashcards
1
Q

Cover pass / cap / wash coat

A

.

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2
Q

AIT
Hot pass = first fill

A

.

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3
Q

Electrode angle
Fillet welds
Butt joints

A

One half the included joint angle
45 degrees material surface
Perpendicular to surface

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4
Q

If undercut becomes a problem

A

Point heat source towards undercut, this forces area to become hotter, molten metal flows to the hottest point

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5
Q

Welding parameters should not exceed heat sink capabilities of base metal

A

Hotter is not always better

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6
Q

Electrode inclination
Backhand - forehand

A

Backhand has the electrode pointed back of puddle

Forehand electrode pointed in direction of travel

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7
Q

Smaw electrode inclination

A

5-30 degrees
Forehand or backhand

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8
Q

Forehand

A

Flatter, wider, smooth metal flow, less penetration

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9
Q

Backhand

A

Arc force holds the molten metal back from crater, deeper pen, narrow bead with more build up

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10
Q

Root and hot pass

A

Exaggerate backhand to get deeper penetration to dig out impurities

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11
Q

Inclination : flat

A

5 forehand 15 backhand

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12
Q

Inclination : vertical

A

0 - 10 forehand

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13
Q

Inclination : overhand

A

5 forehand - 15 backhand

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14
Q

Inclination : uphill pipe

A

5 backhand in over head
5 forehand inclination other positions
Rule of thumb: always point to centre of pipe

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15
Q

AIT
Manipulative welding technique

A

Whipping action (6010)

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16
Q

Root face is

A

The land

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17
Q

Stringer padding

A

Stringer beads to uniformly build up a surface, over lap previous bead by 1/3

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18
Q

Stringer fill

A

Planned to blend into a finished contour and made with a series of overlapping stringer beads

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19
Q

Short arc - choked arc

A

Excessive penetration, poor metal flow, narrow high crowned beads

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20
Q

Too fast cooling rate =

A

Hardness

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21
Q

Weave bead should not exceed …

A

2/3 times electrode diameter

Too wide can make slag entrapment at the toes (edges) of the bead

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22
Q

AIT
Herringbone weave variation eliminates …

A

Undercut

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23
Q

Crescent weave can lead too…

A

Undercut

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24
Q

Lazy L weave

A

Cover pass
Horizontal position

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25
Q

Sawtooth weave

A

Acts as a gravitational correction particularly along the top edge of the weld

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26
Q

E4310 (E6010)

A

1/8 - DC-EP - 80-140 amps

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27
Q

E4918(E7018)

A

3/32 - AC - DC - EP - 70-100
1/8 - AC - DC - EP - 80 - 175

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28
Q

E7014

A

AC - DC - EN / EP

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29
Q

Polarity check rod

A

6010

30
Q

Puddle is smooth, crisp sounds of bacon with 6010

A

Electrode positive

31
Q

Puddle is violent with appearance of longer arc, higher fume emissions, hissing sound with 6010

A

Machine is electrode negative

32
Q

AIT
Starting arc two methods

A

Tapping method
Scratch method
(Never start arc outside weld zone)

33
Q

Arc length
Normal arc length is …

A

Considered to be same as the diameter of the core wire of the electrode

34
Q

Short arc (choked arc)

A

Deeper penetration, higher rate of weld metal deposition, narrow, less fluid puddle that tends to build up

35
Q

Long arc

A

Shallow penetration, lower deposition rate, wider more fluid puddle that blends well at the edge of bead

36
Q

Crucible cup (inverted cup)

A

Helps stabilize electrode maintains consistent arc length

Electrodes with high iron powder = contact electrodes
7024, 7014

37
Q

1F

A

Flat fillet
Joint surface approximately 45 degrees to horizontal plane

38
Q

2F

A

5 - 30 backhand root
0 - 30 backhand for all other passes
More backhand = more penetration
More straight on = better blending

39
Q

3F

A

Position lap joint
Vertical
Angle to the sides to reduce undercut
3 passes, 1/2 included angle
0-10 backhand or forehand for each pass

40
Q

4F

A

Over head fillet
1-7 passes

41
Q

Stringer padding means that the base metal surfaces are to be

A

Built up uniformly using stringer beads

42
Q

A root pass is produced when the

A

First penetrating bead is at the root of the joint

43
Q

Weave beads are deposited when the electrode is

A

Moved forward and side to side while welding

44
Q

A cover pass is a

A

Thin weave or a series of passes used as the final layer of weld metal

45
Q

What is the main purpose of pausing on the edges of a weave bead

A

To obtain a blend to eliminate undercut at the toes of the weld bead

46
Q

Electrode angle is …

A

Normally one half of the angle of the joint

47
Q

When the arc length is increased during welding, what happens to these characteristics
- penetration
- puddle fluidity

A

Penetration decreases

Puddle is more fluid

48
Q

What are two commonly used methods for striking the arc with Smaw

A

Tapping method and scratch start

49
Q

Where would you strike the arc on a stop:restart

A

Start the arc within the weld zone where the arc marks are to be remelted with the weld progression

50
Q

Excessive current settings for Smaw are indicated by

A

Excessive spatter

51
Q

A normal arc length is considered equivalent to the

A

Diameter of the core wire of the electrode

52
Q

What arc length gives the following characteristics

A) best blend into the edges of a weld bead
B) deepest penetration
C) highest rate of metal deposit
D) widest bead

A

A) long arc
B) short arc
C) short arc
D) long arc

53
Q

What is the best method for determining the current setting for an electrode

A

Set current according to the manufacturer recommendations and then test on a piece of scrap approximately the same thickness as the metal needed for the weld project

54
Q

What should you do to maintain a normal arc length with electrodes that have a high iron powder coating

A

Keep the flux coating in contact with the metal surface

55
Q

When you deliberately shorten the arc length what are you expecting to achieve

A

Deeper penetration with decreased puddle fluidity

56
Q

What electrode inclination is recommended for the first pass of a 2F weld on 10 mm material using 3.2 mm E4310(6010) electrode

A

5-30 backhand

57
Q

What type of bead is usually used for the cover pass on a 2F weld on 10 mm material

A

Stringer bead

58
Q

What procedure is recommended to complete a 3F weld using E4310 ( 6010) electrodes on a 10 mm material

A

Use one root bead followed by a weave full and weave cover pass

59
Q

What action would you take to avoid excessive build up at the center of the cover pass of a 3F weld

A

Travel faster across the center with a slight increase in arc length

60
Q

What polarity is recommended for these electrodes
A) E4310 (6010)
B) E4914 (7014)
C) E4918 (7018)

A

A) DCEP only
B) AC or DCEN
C) AC or DCEP

61
Q

A quick test for polarity can be done using which electrode

A

E4310 (6010)

62
Q

Changing the inclination of the electrode in relation to the direction of travel

A

Affect the depth of penetration

63
Q

The number and letter combinations 3F and 2G for example represent

A

The required position and type of weld

64
Q

Why is it important to remove the slag between passes on a multi pass weld

A

To help prevent slag inclusions between passed

65
Q

How should you position yourself relative to the weld

A

So that your body is supported and you are able to see the weld zone clearly

66
Q

Which electrode normally requires a manipulative welding technique when doing stringer beads in the flat position

A

E4310 (6010)

67
Q

Which electrode normally uses a drag technique when doing stringer beads

A

E4914 (7014)

68
Q

A filler weld placed on the underside of the joint with one vertical leg and one horizontal leg is ..

A

A horizontal overhead fillet weld

69
Q

Inclination
Moving up or down
Forehand backhand

A

.

70
Q

Angle
Moving the electrode side to side
To change the degree of where the electrode is on the metal

A

.

Second Year Welding (13 decks)

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