1. Weld Joint Geometry and Welding Symbols
Basic Weld Joints
Welding Technology
Graphics compliments of AWS
And ESAB.com
Submitted by
Craig Herald
Welding Instructor
Lee County Area Technology Center
Graphics provided compliments of the American Welding Society Education Department

2. Six Basic Welded Joints
Butt Joint
Butt joint- a joint between two members aligned approximately in the same plane

3. Different Edge Shapes and Symbols for some Butt-Joints

4. Edge Preparation Square Butt joint Single (one side)
Double (both sides)
Bevel or Vee or J

5. Beveling

6. Controlling the molten puddle
There are five generally used ways
of supporting molten weld metal:
Non-fusible backing
Submerged arc flux backing
Root backing
Weld backing
Fusible metallic backing

7. Copper Backing Copper is a good heat conductor Controls molten puddle
Breaks off easily

8. Backing with Sub Arc Flux
The flux powder captures the weld pool
Excessive pressure could create a concave root

9. Backing Weld Not to be confused with a “Back Weld”
Which happens afterward

10. Fusible Metal backing
A tight fitup is optimum

11. Five Basic Welded Joints
Corner Joint
Corner joint - a joint between two members located at right angles to each other

12. Some Different Edge Shapes and Symbols for Corner Joints

13. Corner Joint

14. Five Basic Welded Joints
T- joint - a joint between two members located approximately at right angles to each other in the form of a T
Flat Position 1F

15. Some Different Edge Shapes and Symbols for T-Joint

16. Five Basic Welded Joints
Lap Joint
Lap Joint- a joint between two overlapping members

17. Some Different Edge Shapes and Symbols for Lap Joints

18. Lap Joint

19. Five Basic Welded Joints
Edge Joint
Edge joint- a joint between the edges of two or more parallel or nearly parallel members

20. Some Different Edge Shapes and Symbols for Edge Joints

21. Proper terminology is needed in everyday job communication
Joint design identifies, “the shape , dimensions, and configuration of the joint
The individual workpieces of a joint are called members .
Three types members nonbutting member, butting member , and splice member

22. A butting member is “a joint member that is prevented, by the other member from movement in one direction perpendicular to its thickness dimension”
A nonbutting member is “a joint member that is free to move in any direction perpendicular to its thickness dimension

23. A splice member is “ the work piece that spans the joint in a spliced joint
Single-spliced butt joint
Double-spliced butt joint with joint filler

24. Plug or Slot Weld

25. So what are the 6 joints again??
Butt
Corner
Tee
Lap
Splice
Plug