welding symbols
DESCRIPTION
all type of welding preparation and symbol with colour drawingsTRANSCRIPT
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Welding Symbols(ISO 2553)
and Weld Joint Design
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ELEMENTARY WELD SYMBOLSSquare Groove Weld
Single V Groove Weld
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ELEMENTARY WELD SYMBOLSSingle Bevel Groove Weld
Single V Groove Weld with Broad Root Face
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ELEMENTARY WELD SYMBOLSSingle Bevel Groove Weld with Broad Root Face
Single U Groove Weld
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ELEMENTARY WELD SYMBOLSSingle J Groove Weld
Backing Weld
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ELEMENTARY WELD SYMBOLSFillet Weld
Plug / Slot Weld
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ELEMENTARY WELD SYMBOLSSpot Weld
Seam Weld
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ELEMENTARY WELD SYMBOLSEdge Weld
Surfacing
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SUPPLEMENTARY SYMBOLS
FlatConvex Concave
Weld Profile
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SUPPLEMENTARY SYMBOLS
Toes blended smoothly
Permanent Backing Strip
M
Removable Backing Strip
MR
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SUPPLEMENTARY SYMBOLSPeripheral Welds
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SUPPLEMENTARY SYMBOLS
Site welds
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SUPPLEMENTARY SYMBOLSTail Optional)
Sequence of Information in the Tail
Process (as per ISO 4063)
Acceptance Level (as per ISO 5817 or ISO 10042)
Working Position (as per ISO 6947)
Filler Materials (as per ISO 544 or ISO 2560 or ISO 3581)
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EXAMPLES OF APPLICATIONMethod of representation
Weld Joint
Arrow Line
Reference Line (Continuous)
Reference Line (Dashed)
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EXAMPLES OF APPLICATIONWelding on the Arrow Side
Arrow Side
Other Side
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EXAMPLES OF APPLICATIONWelding on the Other Side
Arrow Side
Other Side
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EXAMPLES OF APPLICATIONWelding on the Other Side
Other Side
Arrow Side
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EXAMPLES OF APPLICATIONWelding on the Arrow Side
Other Side
Arrow Side
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EXAMPLES OF APPLICATIONWhich is the Other Side in this case?
Side A
Side C
Side B
Side D
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EXAMPLES OF APPLICATIONWelding on both Sides
Other Side
Arrow Side
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EXAMPLES OF APPLICATIONSymmetric Welding on both Sides
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EXAMPLES OF APPLICATIONPointing of Arrows for Bevel and J Joints
OR
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EXAMPLES OF APPLICATIONPointing of Arrows for Bevel and J Joints
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DIMENSIONING OF WELDSButt Joints
l
s l s
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DIMENSIONING OF WELDSFillet Welds
z5 l5
5
a5 l
5
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DIMENSIONING OF WELDSFillet Welds
a a a
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DIMENSIONING OF WELDSIntermittent Fillet Welds
l (e) l (e)
z n x l (e)
z n x l (e)
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DIMENSIONING OF WELDSStaggered Intermittent Fillet Welds
z n x l (e)
z n x l (e)
l (e) l (e)
l (e) l (e)
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DIMENSIONING OF WELDSSpot Weld
d n (e)
d
e e
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DIMENSIONING OF WELDSSeam Weld
d n x l (e)
d
l e
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DIMENSIONING OF WELDSPlug Weld
d n (e)
d
e e
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DIMENSIONING OF WELDSSlot Weld
d n x l (e)
d
l e
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WELD JOINT DESIGN
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Edge Preparation - Need
Poor penetration
Poor strength
Good penetration
Good strength (100% joint efficiency)
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Edge PreparationFactors which influence choice of edge preparation
- Thickness- Material- Welding process- Extent of penetration required- Welding distortion- Cost
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Basic Joint Types
butt
teelap
corneredge
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Basic Weld TypesGroove welds
Fillet weldPlug / slot weld
Spot / seam weld
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Applicable Welds for Butt jointSquare Groove weld V Groove weld
U Groove weldBevel Groove weld
J Groove weld
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Applicable Welds for Butt joint
Double V Groove weld
Double U Groove weld
Double Bevel Groove weld
Double J Groove weld
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Applicable Welds for Tee joint
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Applicable Welds for Lap joint
Plug / slot weld Spot / seam weld
Fillet weld
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Applicable Welds for Corner Joint
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Applicable Welds for Edge Joint
Edge weld
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Butt joint
Square Groove weld
Root gap
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Butt jointSingle V Groove weld
Groove angle a
Root face
Root gap
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Weld Reinforcement
Correct reinforcement
Minimum cost
Good joint strength
Excess reinforcement
High cost
Poor joint strength
Under reinforcement
Poor joint strength
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Butt joint Complete Joint penetration
Weld from face side
Back gouging
Back weld
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Butt joint Complete Joint penetration
Backing weld
Back gouging
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Butt joint Complete Joint penetration (welding from one side)
TIG / SMAW welding
Consumable guide
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Butt Joint Double V grooveLess weld metal
Less distortion
Higher edge preparation cost
Better for thickness > 20 mm
More weld metal
More distortion
Lower edge preparation cost
Better for thickness < 20 mm
Double V groove
Single V groove
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Butt Joint U groove
Good access at the root
Less weld metal
Higher edge preparation cost
Better for thickness > 40 mm
Groove angle
Root faceRoot gap
Root radius
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Butt Joint Bevel groove
Double bevel groove
Single bevel groove Bevel angle 40 to 50
Difficult to approach the root
Weld defects
Back gouging to remove root defects
Good weld quality
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Butt Joint J groove
Good access at the root
Back gouging and back welding to get good weld quality
Less weld metal
Higher edge preparation cost
Better for thickness > 40 mm
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Tee Joint Full strength joint
leg
leg throat
throat = 0.707 x leg
leg = 1.414 x throat
In a full strength joint, leg = 0.75 x thickness
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Tee Joint Full penetration joint
leg = throat leg = throat
45 or 60
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Tee Joint
Theoretical throatActual throat
AWS D 1.1 recommendation when gap > 1.6 mm to increase leg size of fillet by the amount of gap
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Lap Joint
AWS D 1.1 recommendation
Overlap = 5 x thickness (1 inch minimum)
Gap between mating faces = 1.6 mm max
overlap
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Welding Position Groove1 G
2 G
3 G
4 G
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Welding Position Groove
1 G 2 G
5 G 6 G
45
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Welding Position Fillet
1F
2F3F
4F
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Welding Position Fillet1F
2F
5F
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Welding Positions Groove
Position Inclination of axis Rotation of face
Flat 0 to 15 150 to 210
Horizontal 0 to 15 80 to 150
210 to 280
Overhead 0 to 80 0 to 80
280 to 360
Vertical 15 to 80 80 to 280
80 to 90 0 to 360
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Welding Positions Fillet
Position Inclination of axis Rotation of face
Flat 0 to 15 150 to 210
Horizontal 0 to 15 125 to 150
210 to 235
Overhead 0 to 80 0 to 125
235 to 360
Vertical 15 to 80 125 to 235
80 to 90 0 to 360