WELD JOINT GEOMETERY AND WELDING SYMBOLS Terminology Definitions

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 = 6 mm Design Throat = 6 mm x 0. 7 Design Throat = 4. 2 mm 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 / 1 G: Flat PA / 1 F Horizontal vertical: PB / 2 F: Horizontal overhead PD / 4 F Vertical upwards PF / 3 G Horizontal vertical: PC / 2 G: Overhead PE / 4 G Vertical downwards PG / 3 G

Welding Positions Weld: Flat Pipe: rotated Axis: Horizontal PG / 5 G PF / 5 G PA / 1 G Weld: Vertical upwards Pipe: Fixed Axis: Horizontal Weld: Vertical Downwards Pipe: Fixed Axis: Horizontal 45 o PC / 2 G Weld: Horizontal vertical Pipe: Fixed Axis: Vertical H-LO 45 / 6 G Weld: Upwards Pipe: Fixed Axis: Inclined