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

Smaw Fillet Welds On Mild Steel 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
Sawtooth weave
Acts as a gravitational correction particularly along the top edge of the weld
26
E4310 (E6010)
1/8 - DC-EP - 80-140 amps
27
E4918(E7018)
3/32 - AC - DC - EP - 70-100 1/8 - AC - DC - EP - 80 - 175
28
E7014
AC - DC - EN / EP
29
Polarity check rod
6010
30
Puddle is smooth, crisp sounds of bacon with 6010
Electrode positive
31
Puddle is violent with appearance of longer arc, higher fume emissions, hissing sound with 6010
Machine is electrode negative
32
AIT Starting arc two methods
Tapping method Scratch method (Never start arc outside weld zone)
33
Arc length Normal arc length is …
Considered to be same as the diameter of the core wire of the electrode
34
Short arc (choked arc)
Deeper penetration, higher rate of weld metal deposition, narrow, less fluid puddle that tends to build up
35
Long arc
Shallow penetration, lower deposition rate, wider more fluid puddle that blends well at the edge of bead
36
Crucible cup (inverted cup)
Helps stabilize electrode maintains consistent arc length Electrodes with high iron powder = contact electrodes 7024, 7014
37
1F
Flat fillet Joint surface approximately 45 degrees to horizontal plane
38
2F
5 - 30 backhand root 0 - 30 backhand for all other passes More backhand = more penetration More straight on = better blending
39
3F
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
4F
Over head fillet 1-7 passes
41
Stringer padding means that the base metal surfaces are to be
Built up uniformly using stringer beads
42
A root pass is produced when the
First penetrating bead is at the root of the joint
43
Weave beads are deposited when the electrode is
Moved forward and side to side while welding
44
A cover pass is a
Thin weave or a series of passes used as the final layer of weld metal
45
What is the main purpose of pausing on the edges of a weave bead
To obtain a blend to eliminate undercut at the toes of the weld bead
46
Electrode angle is …
Normally one half of the angle of the joint
47
When the arc length is increased during welding, what happens to these characteristics - penetration - puddle fluidity
Penetration decreases Puddle is more fluid
48
What are two commonly used methods for striking the arc with Smaw
Tapping method and scratch start
49
Where would you strike the arc on a stop:restart
Start the arc within the weld zone where the arc marks are to be remelted with the weld progression
50
Excessive current settings for Smaw are indicated by
Excessive spatter
51
A normal arc length is considered equivalent to the
Diameter of the core wire of the electrode
52
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) long arc B) short arc C) short arc D) long arc
53
What is the best method for determining the current setting for an electrode
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
What should you do to maintain a normal arc length with electrodes that have a high iron powder coating
Keep the flux coating in contact with the metal surface
55
When you deliberately shorten the arc length what are you expecting to achieve
Deeper penetration with decreased puddle fluidity
56
What electrode inclination is recommended for the first pass of a 2F weld on 10 mm material using 3.2 mm E4310(6010) electrode
5-30 backhand
57
What type of bead is usually used for the cover pass on a 2F weld on 10 mm material
Stringer bead
58
What procedure is recommended to complete a 3F weld using E4310 ( 6010) electrodes on a 10 mm material
Use one root bead followed by a weave full and weave cover pass
59
What action would you take to avoid excessive build up at the center of the cover pass of a 3F weld
Travel faster across the center with a slight increase in arc length
60
What polarity is recommended for these electrodes A) E4310 (6010) B) E4914 (7014) C) E4918 (7018)
A) DCEP only B) AC or DCEN C) AC or DCEP
61
A quick test for polarity can be done using which electrode
E4310 (6010)
62
Changing the inclination of the electrode in relation to the direction of travel
Affect the depth of penetration
63
The number and letter combinations 3F and 2G for example represent
The required position and type of weld
64
Why is it important to remove the slag between passes on a multi pass weld
To help prevent slag inclusions between passed
65
How should you position yourself relative to the weld
So that your body is supported and you are able to see the weld zone clearly
66
Which electrode normally requires a manipulative welding technique when doing stringer beads in the flat position
E4310 (6010)
67
Which electrode normally uses a drag technique when doing stringer beads
E4914 (7014)
68
A filler weld placed on the underside of the joint with one vertical leg and one horizontal leg is ..
A horizontal overhead fillet weld
69
Inclination Moving up or down Forehand backhand
.
70
Angle Moving the electrode side to side To change the degree of where the electrode is on the metal
.

Second Year Welding (13 decks)

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