weld- design -symbols r01
TRANSCRIPT
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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 SYMBOLS
Fillet Weld
Plug / Slot Weld
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ELEMENTARY WELD SYMBOLS
Spot 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 SYMBOLS
Tail 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 APPLICATION
Method of representation
Weld Joint
Arrow Line
Reference Line (Continuous)
Reference Line (Dashed)
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EXAMPLES OF APPLICATION
Welding on the Arrow Side
Arrow Side
Other Side
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EXAMPLES OF APPLICATION
Welding 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 APPLICATION
Which 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 APPLICATION
Symmetric Welding on both Sides
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EXAMPLES OF APPLICATION
Pointing of Arrows for Bevel and J Joints
OR
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EXAMPLES OF APPLICATION
Pointing of Arrows for Bevel and J Joints
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DIMENSIONING OF WELDS
Butt 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 WELDS
Fillet Welds
a a a
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DIMENSIONING OF WELDS
Intermittent Fillet Welds
l (e) l (e)
z n x l (e)
z n x l (e)
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DIMENSIONING OF WELDS
Staggered 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 WELDS
Spot Weld
d n (e)
d
e e
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DIMENSIONING OF WELDS
Seam Weld
d n x l (e)
d
l e
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DIMENSIONING OF WELDS
Plug Weld
d n (e)
d
e e
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DIMENSIONING OF WELDS
Slot 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 Preparation
Factors 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 Types
Groove welds
Fillet weldPlug / slot weld
Spot / seam weld
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Applicable Welds for Butt joint
Square 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 weldSpot / 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
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 grooveBevel 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 throat
Actual 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 – Groove
1 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°