The viewing distance is determined by the ‘Assessment of faults’ table. If, for example, there is a catching mark on a surface that has been marked as surface 3, the viewer must move back until the top line can no longer be read. It must still be possible to read the bottom line at B3 on the Distance scale. Look at the surface of the extrusion for 5 seconds. If it is not possible to detect any deviations, the surface is acceptable.
MISCELLANEOUS
If there are other, customer-specific requirements concerning the appearance of surfaces, then surfaces must be checked using a gauge or similar. This may apply to brushed surfaces, for example.
| Class | Definition | Production | Usable alloys | Viewing distance and time |
|---|---|---|---|---|
| 1 | Scratches, catching marks or other physical damage must not be visible during inspection as per B1 – 5 seconds. | Individual handling at all stages. Only small parts of an extrusion may be classed as surface 1. The runout surface must have a lower surface requirement. Visible surfaces are to be protected by packaging. Die-lines are not acceptable. | EN AW-6060 EN AW-6063 EN AW-6101 | B1 – 5 seconds. |
| Welding zones and heating zones for anodised extrusions. | Individual handling at all stages. Only small parts of an extrusion may be classed as surface 1. The runout surface must have a lower surface requirement. Visible surfaces are to be protected by packaging. Die-lines are not acceptable. | EN AW-6060 EN AW-6063 EN AW-6101 | B2 – 5 seconds. | |
| 2 | Scratches, catching marks or other physical damage must not be visible during inspection as per B2-5 seconds. | Individual handling at all stages. The runout surface must have a lower surface requirement. Visible surfaces are to be protected by packaging. Die-lines are not acceptable. | EN AW-6060 EN AW-6063 EN AW-6101 | B2 – 5 seconds. |
| 3 | Scratches, catching marks or other physical damage must not be visible during inspection as per B3 – 5 seconds. | If production so requires, visible surfaces can be laid together. Visible surfaces are to be protected by packaging. Die-lines are generally not acceptable; assess on a case-by-case basis. | EN AW-6060 EN AW-6063 EN AW-6101 (EN AW-6005) | B3 – 5 seconds. |
| Welding zones and heating zones for anodised extrusions. | Visible surfaces can be laid together during packaging if they are anodised. Die-lines are generally not acceptable; assess on a case-by-case basis. | EN AW-6060 EN AW-6063 EN AW-6101 (EN AW-6005) | B4 – 5 seconds. | |
| 4 | Scratches, die-lines, catching marks or other physical damage must not be visible during inspection as per B4 – 5 seconds. | Extrusions can be laid together at all stages. Die-lines can occur. | EN AW-6060 EN AW-6063 EN AW-6101 EN AW-6005 EN AW-6351 EN AW-6082 | B4 – 5 seconds. |
| Welding zones and heating zones for anodised extrusions | Extrusions can be laid together at all stages. Die-lines can occur. | EN AW-6060 EN AW-6063 EN AW-6101 EN AW-6005 EN AW-6351 EN AW-6082 | B5 – 5 seconds. | |
| 5 | Only dimensional and strength requirements. | Here there are no requirements for surface appearance. However, any defects must not be such that they could cause personal injury. | EN AW-6060 EN AW-6063 EN AW-6101 EN AW-6005 EN AW-6351 EN AW-6082 | |
