In this chapter, student are expose to welding design

1. Weld Joint Geometry and
Welding Symbols

2. ADVANTAGES & DISADVANTAGES
OF WELDING JOINTS
ADVANTAGES DISADVANTAGES
• Welded joints have low initial cost • Welded joint cannot be used for
• The process is noiseless. impact load and vibrations
• welded joints are greater in strength • Being permanent joint the welded
• Less machining is required after joint cannot be assembled and
welding. reassembled like screwed joints
• Easy to inspect i.e. by x-rays without
destroying the piece.
• Welded joint can easily be repaired.

3. GENERAL WELDING SYMBOL

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

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

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

7. Some Different Edge
Shapes and Symbols for
Corner Joints

8. Five Basic Welded Joints
T-Joint
T- joint - a joint between
two members located
approximately at right
angles to each other in
the form of a T

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

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

11. Some Different Edge
Shapes and Symbols for
Lap Joints

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

13. Some Different Edge
Shapes and Symbols for
Edge Joints

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

15. 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

16. 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

17. LOAD REACTS IN WELDING JOINTS
F
F
STRESS FOR HORIZONTAL LOAD, σ = F/A

18. ACTIVITY 1