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FIGURE 5-1
Types of joints. © Cengage Learning 2012
Welding Joint Design & Welding Symbols – Chapter #5
FIGURE 5-2 Two ways of fitting up an outside corner joint. © Cengage Learning 2012
FIGURE 5-3 Edge joints. © Cengage Learning 2012
Open Corner Closed Corner
Welding Joint Design & Welding Symbols – Chapter #5
NOTE: "fillet weld" = a triangular shaped weld in a corner
Name three types of joints that use fillet welds?
Welding Joint Design & Welding Symbols – Chapter #5
NOTE:
While Leg Size is the usual
method to specify and
measure weld size, the
Effective Throat is a more
accurate measure of fillet
weld strength!
Effective
Throat
Actual ThroatLeg Size2
Leg Size1
Theoretical
Throat
Convexity
¼
How is the size of a fillet determined?
Welding Joint Design & Welding Symbols – Chapter #5
Accessibility for welding
Strength requirements
Cyclic or static loading
Material thickness
Welding process to be used
Material type
Code Requirements
Cost
Side Note: some considerations in selecting a type of joint to
use on a fabrication.
Welding Joint Design & Welding Symbols – Chapter #5
Bevel Groove Vee Groove
J Groove
U GrooveSquare Groove
Name two edge preparations used with butt joints.
Welding Joint Design & Welding Symbols – Chapter #5
Edge preparations used with butt joints.
Welding Joint Design & Welding Symbols – Chapter #5
1
2
1 2 3
4
Single V Groove
Double V Groove
Welding Joint Design & Welding Symbols – Chapter #5
Cost◦ A number of items affect weld cost
FIGURE 5-14 Even a slight change in groove angle can save time and money. © Cengage Learning 2012
Welding Joint Design & Welding Symbols – Chapter #5
Welding Symbols (cont’d.)
3 parts of the welding symbol body:
Arrow
Reference Line
Tail
Welding Joint Design & Welding Symbols – Chapter #5
Welds on drawings ČSN EN ISO 2553
A Z n x L Z(e)
T
A - size
Z – weld sign
n – number of welds
L - length
e – distance
Z – intermittent weld
T – technology information
a7 10 x 300 (200)
a z
z = a . 2
a = 0,5-0,7t
Kde: t= BM thickness
Circumferential weld
Field weld
a7 10 x 300 (200)
111 ČSN EN 05 0705
C (ČSN 5817)
PC (ČSN EN ISO 6947)
OK 12.51
UPPER VIEW
Intermittent weld Opposing weld
Elementary welding symbols
Elementary welding symbols
Dual
Ref.Line
To be welded on the other
side
To be welded on the arrow
side
Examples:
Combination of elementary symbols
Combination of elementary symbols
Dimensioning the weld
Dimensioning
PA
PC
PE
PF
PG
Welding positionsČSN EN ISO 6947
Angled axis
L=45°
L=60°
CIRCLE
Top edge
Top edge
FRAMES -Civil engineering structures - Buildings,
bridges
Mechanical engineering-frames, coverings, shafts
Energy generation and transfer
PRESSURE VESSELS (shells) Processing industry
, Tubular frames-sea platforms
Types of Welded structure
Material
Function of welds
Static, dynamic loaded structure
Loading conditions
Fully loaded welds?
Working environment
Precision of the part - Distortion, inner tension
Productivity, Costs
On site, jobshop welding
On following figures answer
Material
Function of welds
Static, dynamic loaded structure
Loading conditions
Fully loaded welds?
Working environment
Precision of the part - Distortion, inner tension
Productivity, Costs
On site, jobshop welding
On following figures answer
Material
Function of welds
Static, dynamic loaded structure
Loading conditions
Fully loaded welds?
Working environment
Precision of the part - Distortion, inner tension
Productivity, Costs
On site, jobshop welding
On following figures answer
Function of welds - Static, dynamic loaded structure
Loading conditions
Working environment
Precision of the part
Productivity, Costs
Accessibility for welding-On site, jobshop welding
Welding process to be used
Material type
Code Requirements
Cost
To consider for design of Welded structure
Good force transfer
High load capacity
Dynamic loading – full penetration weld
Difficult edge preparation
Load carrying in bending
Easy execution
a increase difficult
Risk of weld quench
For thin sheets
Good smooth look
Easy assembly
No weld is best
Smaller better than big
Humidity = Enemy
Think how the stress pass through structure
Simple rules for design of Welded structure
