Category 5
| 5.W.1 | Welding and/or brazing (n.e.s.). |
Category 4
| 4.W.1 | Manual welding on pre-prepared structural steel and/or pipework parts and components, in all positions, including: |
| 4.W.1.1 | Butt welding carbon steel pipe joints and/or structural joints, in all positions, subject to non-statutory radiographic and/or ultrasonic tests. |
| 4.W.1.2 | Fillet welding carbon steel pipe joints and/or structural joints, in all positions, subject to non-statutory radiographic and/or ultrasonic tests. |
| 4.W.2 | Manual fillet welding of non-pressure parts attached to boilertubes, in all positions, where mandatory coding requirements must be met. |
Category 3
| 3.W.1 | Semi-automatic welding, including pressure vessels where mandatory coding requirements are to be met, including: |
| 3.W.1.1 | Semi-automatic flux cored wire arc welding. |
| 3.W.1.2 | Semi-automatic gas-shielded wire arc welding. |
| 3.W.1.3 | Semi-automatic submerged arc welding. |
| 3.W.2 | Manual ferrous welding in down hand position, including: |
| 3.W.2.1 | Butt welding steel pipe joints and/or structural steel joints in down hand position. |
| 3.W.2.2 | Fillet welding steel pipe joints and/or structural steel joints in down hand position. |
Category 2
| 2.W.1 | Pre-set automatic welding, including pressure vessels where mandatory coding requirements are to be met, including: |
| 2.W.1.1 | Operating pre-set automatic submerged arc welding machines. |
| 2.W.1.2 | Operating pre-set automatic flux cored wire arc welding machines. |
| 2.W.1.3 | Operating pre-set automatic gas shielded wire arc welding machines. |
| 2.W.1.4 | Operating automatic butt and/or flash and/or projection and/or spot and/or arc spot and/or stud welding machines. |
| 2.W.1.5 | Repetition brazing by pre-set automatic machines not involving the use of filler rods. |
| 2.W.2 | Preliminary welding of runs not exceeding 50 mm in length for positioning of jobs prior to welding, riveting or bolting up. |
Category 1
Category 1(a)
1.W.1(a) Basic labouring during first nine months’ service.
