: They ensure each layer is cleaned of slag before the next is added and look for visible cracks or cavities.

However, there is an important technical correction to make first:

: A minimum light intensity of 350 lux is required, though 500 lux is recommended for more detailed inspections.

| Source | Format | Cost | Notes | | :--- | :--- | :--- | :--- | | (bsigroup.com) | Secure PDF | £130-200 | Official, searchable, watermarked | | ISO 17637:2016 (iso.org) | PDF | ~150 CHF | Current standard – recommended instead | | Your company’s document control | Internal PDF | Free | Check if already purchased | | University library (Standards subscription) | PDF | Free for students | Access via ASTM/BSOL |

By adopting BS EN 970 visual inspection best practices and utilizing PDF resources, you can:

Note: While BS EN 970 was the standard for years, it has technically been superseded by . However, the technical requirements regarding inspection procedures and acceptance criteria remain largely consistent. This paper refers to the established practices defined in the EN 970 framework.