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Handling, storage and introductory quality control · Lesson 4 of 4

Handling, storage and introductory quality control: defects, verification and case study

Eight defects to recognize, the stop-and-report steps, who decides what is acceptable, a worked case study and a storage walk-round checklist.

You will be able to: Recognize eight common handling and storage defects, say what to do and not do when you find one, work a case study from evidence to cause to prevention, and run a storage walk-round.

12 min · 11 slides · 9 questions

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Slide 1 of 11

Spot it, name it, report it

This lesson covers eight common handling and storage defects: wet storage stain, water stain on aluminum, handprints, skin-oil marks, swarf rust, film left on, scratches and fretting.

The card diagram shows each one: the clue, the likely cause and what an apprentice does.

Spot it, name it, report it: eight handling and storage defectsEight cards, each with a drawn swatch on red metal, the defect name and its clue: wet storage stain, water stain, handprints, skin-oil marks, swarf rust, film left on, scratches and fretting. A bar below gives the same report steps for every card: stop, separate wet material, photograph, tag and hold, tell your supervisor, write it down, and never scrub or touch up a finish.Wet storage stainwhite powder,mirror imageWater stainirregular marks,aluminum sheetsHandprintsdark palm marks onbare galvanizedSkin-oil marksfingerprints onzinc and copperSwarf rustrust specks wherefilings landedFilm left ontorn film, stickyresidue at edgesScratchesparallel lines fromsliding or trafficFrettingblack marks, faintmirror on reverseStop. Separate wet material.Photograph. Tag and hold.Tell your supervisor. Write it down.Never scrub or touch up a finish.

Eight cards, each with a drawn swatch on red metal, the defect name and its clue: wet storage stain, water stain, handprints, skin-oil marks, swarf rust, film left on, scratches and fretting. A bar below gives the same report steps for every card: stop, separate wet material, photograph, tag and hold, tell your supervisor, write it down, and never scrub or touch up a finish.

Clues from U.S. Steel TBP 2005.16, GalvInfo 6.1, the Aluminum Association TR-3 and Sheffield Metals; the photograph, tag and hold steps are module advice. The swatches are drawings, not photographs, and a mark that looks like one defect may be another, so report it.

Sources

Glossary

Fretting
Permanent black spots, marks, lines or patches on galvanized sheet caused by load and repeated small movement, usually in transit. It has a fainter mirror image on the reverse side.
Swarf
Small metal filings from cutting or drilling. Left on a panel face, they rust and stain it, so debris is cleared at the end of each workday.
Mirror image
A stain pattern repeated on the face of the panel it was stacked against, a clue that moisture was trapped between them. Fretting also has a fainter mirror image, but on the reverse side of the same sheet.
Hold
Setting material aside, tagged, so it is not used until a supervisor decides whether it is acceptable.