Joint Welding Symbol

WELD JOINT GEOMETERY AND WELDING SYMBOLS

A Joint:

A configuration of members

A Weld:

A union between materials caused by heat, and or pressure

Terminology & DefinitionsTerminology & Definitions

Edge Open & Closed Corner Lap

TeeCruciform

Butt

Joint TerminologyJoint Terminology

Compound Fillet Butt

Edge Spot Plug

Welded Joint TerminologyWelded Joint Terminology

Butt WeldsButt Welds

Single Bevel VeeSingle

Single J Single U

Single sided preparations are normally made on thinner materials, or when access form both sides is restricted

Single sided Butt PreparationsSingle sided Butt Preparations

Double sided preparations are normally made on thicker materials, or when access form both sides is unrestricted

VeeDoubleBevelDouble

JDouble UDouble

Double sided Butt PreparationsDouble sided Butt Preparations

Weld Zone TermsWeld Zone Terms

Weld Junction

C

A B

D

Weld zone

Heat Affected Zone

Root

Weld metal

A, B, C & D = Weld Toes

Fusion zone

Face

Butt Weld FeaturesButt Weld FeaturesWeld cap width

Excess Root Penetration

ExcessCap heightor Weld Reinforcement

Root bead width

Fillet WeldsFillet Welds

b

b. = Horizontal leg length

a

a. = Vertical leg length

Fillet Weld Leg LengthsFillet Weld Leg Lengths

Fillet Weld Throat ThicknessFillet Weld Throat Thickness

ba

b. = Actual Throat Thickness

a. = Design Throat Thickness

Deep Penetration Fillet Weld FeaturesDeep Penetration Fillet Weld Features

ba

b. = Depth of Penetration

a. = Design Throat Thickness

a

a = Design / Theoretical throat thickness

s

s = Actual throat thickness

b

b = Horizontal leg lengthcc = Vertical leg length

The leg length should be approximately equal to the material thicknessThe design throat thickness is 0.7 of the leg length

e.gLeg length = 6mmDesign Throat = 6mm x 0.7Design Throat = 4.2mm

Fillet Weld DimensionsFillet Weld Dimensions

Mitre fillet Convex fillet

Concave fillet

A concave profile is preferred for joints subjected to fatigue loading

Fillet Weld ProfilesFillet Weld Profiles

Welding PositionsWelding Positions

Flat: PA / 1G: Flat PA / 1F

Horizontal vertical: PC / 2G:

Horizontal vertical: PB / 2F:

Horizontal overhead PD / 4F

OverheadPE / 4G

Vertical downwards PG / 3G

Vertical upwardsPF / 3G


Weld: FlatPipe: rotatedAxis: Horizontal

PA / 1G Weld: Vertical DownwardsPipe: FixedAxis: Horizontal

PG / 5G

Weld: Vertical upwardsPipe: FixedAxis: Horizontal

PF / 5G

H-LO 45 / 6G Weld: Upwards Pipe: FixedAxis: Inclined

Weld: Horizontal vertical Pipe: FixedAxis: Vertical

PC / 2G

45o


IWE WELDING DESIGN PRE-COURSE

TYPE OF JOINTS


TYPE OF JOINTS


TYPE OF JOINTS


TYPE OF JOINTS PREPRATION















TYPES OF WELDS


TYPE OF WELDS






BUTT WELDS


BUTT WELDS

FULL PENETRATION

PARTIAL PENETRATION



FULL PENETRATION


PARTIAL PENETRATION


FILLET WELDS


FILLET WELDS

FULL PENETRATION

PARTIAL PENETRATION










WELDING SYMBOLS




















GEOMETRICAL CHARACHTRESTICS

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Documents

Joint Welding Symbol