Transcript Welding Symbols

WELD JOINT GEOMETERY
AND WELDING SYMBOLS
Terminology & Definitions
A Weld:
A union between materials caused by heat,
and or pressure
A Joint:
A configuration of members
Joint Terminology
Edge
Open & Closed Corner
Lap
Butt
Tee
Cruciform
Welded Joint Terminology
Compound
Edge
Fillet
Spot
Butt
Plug
Butt Welds
Single sided Butt Preparations
Single sided preparations are normally made on thinner
materials, or when access form both sides is restricted
Single Bevel
Single Vee
Single J
Single U
Double sided Butt Preparations
Double sided preparations are normally made on thicker
materials, or when access form both sides is unrestricted
Double Bevel
Double Vee
Double J
Double U
Weld Zone Terms
Weld zone
Face
A
B
Weld
metal
Fusion
zone
Heat
Affected
Zone
Weld
Junction
C
D
Root
A, B, C & D = Weld Toes
Butt Weld Features
Weld cap width
Excess
Cap height
or Weld
Reinforcement
Excess Root
Penetration
Root bead width
Fillet Welds
Fillet Weld Leg Lengths
a
b
a. = Vertical leg length
b. = Horizontal leg length
Fillet Weld Throat Thickness
a
b
a. = Design Throat Thickness
b. = Actual Throat Thickness
Deep Penetration Fillet Weld Features
a
b
a. = Design Throat Thickness
b. = Depth of Penetration
Fillet Weld Dimensions
a = Design / Theoretical
throat thickness
s = Actual throat
thickness
b = Horizontal leg length
c
c = Vertical leg length
a
b
s
e.g
Leg length = 6mm
Design Throat = 6mm x 0.7
Design Throat = 4.2mm
The leg length should be approximately equal to the
material thickness
The design throat thickness is 0.7 of the leg length
Fillet Weld Profiles
Mitre fillet
Convex fillet
Concave fillet
A concave profile is
preferred for joints
subjected to fatigue loading
Welding Positions
Welding Positions
Flat: PA / 1G:
Flat PA / 1F
Vertical upwards
PF / 3G
Horizontal vertical:
PB / 2F:
Horizontal overhead
PD / 4F
Horizontal vertical:
PC / 2G:
Overhead
PE / 4G
Vertical downwards
PG / 3G
Welding Positions
Weld: Flat
Pipe: rotated
Axis: Horizontal
PG / 5G
PF / 5G
PA / 1G
Weld: Vertical upwards
Pipe: Fixed
Axis: Horizontal
Weld: Vertical Downwards
Pipe: Fixed
Axis: Horizontal
45o
PC / 2G
Weld: Horizontal vertical
Pipe: Fixed
Axis: Vertical
H-LO 45 / 6G
Weld: Upwards
Pipe: Fixed
Axis: Inclined
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TYPE OF JOINTS
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TYPES OF WELDS
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BUTT WELDS
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FULL PENETRATION
BUTT WELDS
PARTIAL PENETRATION
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FILLET WELDS
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FILLET WELDS
PARTIAL PENETRATION
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WELDING SYMBOLS
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GEOMETRICAL
CHARACHTRESTICS
REVIEW EXCERSICES
Any Questions