During a food machinery factory audit, which welding and surface treatment items must be checked for food-grade acceptance?
• Verify continuous full-penetration welds with no porosity or undercut; food-contact surfaces ground to Ra≤0.8μm.
• Confirm passivation records and blue-point test showing no free iron.
• Use borescope on pipes; weld misalignment ≤0.5mm with no pooling depressions.
• Cross-check 304/316L mill certificates against spectrometer re-test.
• Require cleaning validation with ATP swab results RLU≤30.
• Confirm passivation records and blue-point test showing no free iron.
• Use borescope on pipes; weld misalignment ≤0.5mm with no pooling depressions.
• Cross-check 304/316L mill certificates against spectrometer re-test.
• Require cleaning validation with ATP swab results RLU≤30.