.....wird vom Mitarbeiter der Zertifizierungsstelle an jedem Prüfstück der äußere Befund entsprechend den Festlegungen der zutreffenden Regelwerke festgestellt

this is to do with welder qualification testing and is the bit about checking how the welder has welded his test specimen piece

the employee of the certification body determines/identifies/checks der äußere Befund of each test specimen in accordance with the specifications of the applicable regulations

This surely isn't "the external findings" - is it more like "the external condition"?

Grateful as ever for any assistance :)