TWI CSWIP 3.0 Inspection of Fillet Welds

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TWI CSWIP 3.0

INSPECTION OF FILLET WELDS

TWI CSWIP 3.0

INSPECTION OF FILLET WELDS


Fillet Weld InspectionFillet Weld Inspection

CSWIP 3.0 Fillet Welded T Joint

Part of the CSWIP 3.0 examination is to inspect & assess a Fillet welded Tee for it’s size & visual acceptance to the applicable code.

F 123


1. The plate reference number must be recorded in the top left hand corner of the report sheet, then the thickness of the plate must be measured and entered in the top right hand corner of the report sheet in the boxes provided.

Specimen Number F123 Material thickness: 6mm



2) Both the Vertical and Horizontal fillet weld leg lengths must be measured to find the minimum and maximum size’s. These values are entered in the boxes provided on the report sheet.

Use the gauge as shown below:


Fillet Weld Leg Length:

The gauge may be used to measure fillet weld leg lengths up to a maximum of 25mm, as shown on left.


3) The minimum and maximum throat thickness are measured and entered in the boxes provided on the report sheet.

These values are measured as shown below:


Fillet Weld Throat Thickness:

The small sliding pointer reads up to 20mm, or ¾ inch.

When measuring the throat it is supposed that the fillet weld has a nominal throat thickness, as an effective throat thickness cannot be measured in this manner.


Having made all the above measurements they can be assessed to a set of values that may be simply calculated from the plate thickness.


a) The minimum leg length size is the plate thickness

b) The maximum leg length size is:The plate thickness + 3mm

c) The minimum throat thickness is:The plate thickness x 0.7

d) The maximum throat thickness is:The plate thickness + 0.5mm


For example if the plate thickness is 6mm then the following will apply:


6mmF 123

a) The minimum leg length size is 6mm (Plate thickness)

b) The maximum leg length size is 9mm(Plate thickness + 3mm)

c) The minimum throat thickness is 4.2mm(Plate thickness x 0.7)

d) The maximum throat thickness is 6.5mm (Plate thickness + 0.5mm


This means that the measurements taken must fall inside BOTH the tolerances calculated i.e.

Leg lengths must be between 6mm – 9mm

Throat thickness must be between 4.2 and 6.5mm

If all the values are within these tolerances they are acceptable. If any of the values fall outside of the calculated tolerances then it becomes unacceptable.

It is important to remember that any change in thickness will change the acceptance values calculated above.



Vertical Leg LengthLowest leg measurement 7mmHighest leg measurement 8mm

Actual Throat ThicknessLowest throat measurement 4.5mmHighest throat measurement 8mm

Horizontal Leg LengthLowest leg measurement 5mmHighest leg measurement 10mm



Practical Exam Report Sheet

Specimen Number F123 Material thickness: 6mm 1) Measure and record the following details: VERTICAL LEG LENGTH (Max & Min) = Max 8mm Min 7mm

HORIZONTAL LEG LENGTH (Max & Min) = Max 10mm Min 5mm

DESIGN THROAT THICKNESS (Max & Min) = Max 8mm Min 4.5mm



2) Sentence the fillet weld dimensions using the following design criteria: MINIMUM LEG LENGTH: Material thickness (6mm)MAXIMUM LEG LENGTH: Material thickness + 3mm (9 mm) MINIMUM THROAT THICKNESS: Material thickness x 0.7 (4.2 mm)MAXIMUM THROAT THICKNESS: Material thickness + 0.5mm (6.5 mm)

The VERTICAL LEG LENGTH Please state: ACCEPT ACCEPT or REJECT?

The HORIZONTAL LEG LENGTH Please state: REJECT ACCEPT or

REJECT? The THROAT THICKNESSPlease state: REJECT ACCEPT or REJECT?



Having assessed the weld for its size an inspection can then be made on the surface to locate any imperfections. Firstly; the report sheet requests the inspector to indicate the number of locations that the following imperfections occur, if any? 3) The number of places that they occur should now be entered in the box as follows: UNDERCUT APPEAR? 3 placesOVERLAP APPEAR? None LACK OF FUSION APPEAR? NoneCRACKS APPEAR? None POROSITY APPEAR? 2 AreasSOLID INCULSIONS? 1 Slag InclusionMISC: [ARC STRIKES etc] Spatter



4) For the defects recorded state: MAXIMUM length (and DEPTH if applicable) of each defect

UNDERCUT: Length: 15 mm Depth:

Smooth 1.0mm OVERLAP: Length: -------- Depth: --------- LACK OF FUSION:Length: -------- Depth: --------- CRACKS: Length: -------- Depth: ---------

POROSITY: Length: 6mm Depth: Maximum Ø SOLID INCLUSIONS: Length: 4mm Depth: ---------

MISC:[ ARC STRIKES] Length: Spatter Depth: ---------



5) Then, assess the levels of imperfections allowed by the applicable code which is provided:

UNDERCUT: ACCEPT (Accept or

Reject?)OVERLAP: ACCEPT (Accept or

Reject?)LACK OF FUSION: ACCEPT (Accept or

Reject?)CRACKS: ACCEPT (Accept or Reject?)POROSITY: REJECT (Accept or Reject?)SOLID INCLUSION: REJECT (Accept or Reject?)MISC: [ARC STRIKES] REJECT* (Accept or Reject?)

* All spatters should have been removed prior to submission for inspection



6) Finally accept or reject the weld used for your visual inspection as follows:

IS THE WELD ACCEPTABLE? NO YES/NO?

Signature: I C Plenty

Name: I C Plenty

Date: 01-01-04

This now completes the Fillet Welded T Joint Inspection Assessment.


TWI CSWIP 3.0 Inspection of Fillet Welds

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