CSWIP 3.0 fillet welded T joint
Part of the CSWIP 3.0 examination is to assess a fillet welded T joint for size and visual acceptance of the weld and joint.
Both fillet weld leg lengths are measured to find both maximum and minimum leg lengths in both vertical and horizontal legs. These values are entered in the boxes on the report sheet. Use the gauge as shown below:
The maximum and minimum throat thickness is measured and entered in the boxes on the report sheet. These values are measured as shown below:
Fillet weld leg length
The gauge measure fillet weld leg lengths up to 25mm, as shown on the left.
F 123
Fillet weld actual 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.
WIS1-40215
Appendix 1 A1-2 Copyright © TWI Ltd 2015
Having made all the above measurements they can be assessed to a set of values that can be calculated from the plate thickness:
a Minimum leg length is the plate thickness.
b Maximum leg length is the plate thickness + 3mm.
c Minimum throat thickness is the plate thickness x 0.7.
d Maximum throat thickness is the plate thickness + 0.5mm.
For example if the plate thickness is 6mm then the following will apply:
a Minimum leg length is 6mm (plate thickness).
b Maximum leg length is the 9mm (plate thickness + 3mm).
c Minimum throat thickness is the 4.2mm (plate thickness x 0.7).
d Maximum throat thickness is the 6.5mm (plate thickness + 0.5mm.
So the measurements taken must fall inside the two tolerances calculated, ie:
1 Leg lengths must be between 6 and 9mm.
2 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.
6mm
F 123
WIS1-40215
Appendix 1 A1-3 Copyright © TWI Ltd 2015
It is important to remember that any change in thickness will change the acceptance values calculated above.
When completing the report sheets from a sample it should appear as follows:
Example of practical exam
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 10mm min 5mm.
Design throat thickness ( “ “ ) = max 8mm min 4.5 mm.
2 Sentence the fillet weld dimensions using the following design criteria:
Minimum leg length: Material thickness (6mm).
Maximum leg length: Material thickness + 3mm (9mm).
Minimum throat thickness: Material thickness x 0.7 (4.2mm).
Maximum throat thickness: Material thickness + 0.5mm (6.5mm).
3 Answer the 14 multi choice questions and base your accept and reject on the acceptance criteria provided.
Actual throat thickness
WIS1-40215
Appendix 2 A2-1 Copyright © TWI Ltd 2015
Acceptance levels plate Acceptance
levels fillet
Remarks Maximum allowance Remarks
1 Excess weld metal
At no point shall the excess weld metal fall below the
outside surface of the parent material. All weld runs shall blend smoothly.
Excess weld metal will not exceed H = 2mm in any area on the parent material,
showing smooth transition at weld toes.
Throat thickness trapped in the weld metal or between the weld metal and
the parent material.
The length of the slag inclusion shall not exceed 50mm continuous or intermittent.
Accumulative totals shall not exceed 50mm
L = 12 mm Max Accumulative
3 Undercut
Undercut is defined as a groove melted into the parent metal, at the toes of the weld excess metal, root
or adjacent weld metal.
No sharp indications Smooth blend required. The length of any undercut shall
not exceed 50mm continuous or intermittent. Accumulative totals shall not
exceed 50mm. Max D = 1mm for the cap weld metal. Root undercut not permitted.
Depth 10% of t
Trapped gas, in weld metal, elongated, individual pores, cluster porosity, piping or
wormhole porosity.
Individual pores 1.5 max. Cluster porosity maximum 502mm total area. Elongated,
piping or wormholes 15mm max. L continuous or intermittent.
As for plate
5 Laminations Cracks or
Transverse, longitudinal,
star or crater cracks. Not permitted Not permitted
6 Lack of fusion Laps Cold lap
Incomplete fusion between the weld metal and base material, incomplete fusion
between weld metal. (lack of inter-run fusion)
Surface breaking lack of side wall fusion, lack of inter-run fusion continuous or
intermittent not to exceed 15mm.
Accumulative totals not to exceed 15mm over a 300mm length of weld.
As for plate
7 Arc strikes
Damage to the parent material or weld metal, from an unintentional touch down of the electrode or arcing from poor connections in the
welding circuit.
Not permitted Not permitted
8 Mechanical damage
Damage to the parent material or weld metal, internal or external resulting
from any activities.
No stray tack welds permitted Parent material must be smoothly blended General corrosion permitted. Max. D = 1.5mm. Only 1 location allowed
As for plate
9 Misalignment Mismatch between the
welded or unwelded joint. Max H = 1.5mm N/A
10 Penetration Excess weld metal, above the base material in the root
of the joint.
Max H ≤ 3mm N/A
11 Lack of root penetration
The absence of weld metal in the root both faces
showing. Not permitted N/A
12 Lack of root
fusion Inadequate cross
penetration of one root face. Lack of root fusion, not to exceed 50mm
total continuous or accumulative. N/A
13 Burn through Excessive penetration,
collapse of the weld root Not permitted N/A
14 distortion Angular Distortion due to weld
contraction 5mm max. Plate only N/A
15 concavity Root
Weld metal below the surface of both parent
materials
50mm maximum length
3mm maximum depth N/A
Table number Defect type