Terms & DefinitionsHeat Affected Zone
What do I look for?
What equipment do I need?
How do I interpret the code or standard requirements?
What is the nature of the product?
What operating conditions will be present?
What is the quality of welding required?
Is there a code or standard available to inspect the welds against
Visual Inspection Procedures
Interpass temperature
Consumable control
During Welding
Excess weld metal
Actual throat thickness
Design throat thickness
4mm
6mm
8mm
4mm
(a)
(b)
4mm
4mm
6mm
6mm
(a)
(b)
2
The volume of (b) is over double the volume of (a)
Without the extra reinforcement being added
4mm
4mm
6mm
6mm
(a)
(b)
The Leg length is 14mm what is the Throat?
10mm
14mm
Fillet welds connecting parts with fusion faces with an angle more than 1200 or less than 600 should not use the above calculations
Copyright © 2004, TWI Ltd
Features to Consider
The design throat thickness of a flat or convex fillet weld connecting parts with the fusion faces which form an angle between 600 and 1200 may be calculated by multiplying the leg length by the appropriate factors as given below
Angle between fusion faces in degrees
Factor
60 to 90 91 to 100 101 to 106 107 to 113 114 to 120
0.7 0.65 0.6 0.55 0.5
Copyright © 2004, TWI Ltd
Features to Consider