Identification of parts for galvanising
Every day, galvanising plants process large batches of steel from several clients that include all sorts of different parts. It often makes more sense to split up batches - small parts are hot-dip galvanised by the Rotocoat centrifuge galvanising plant - and to process material from different clients at the same time.
To prevent materials getting mixed up and to maintain production efficiency, materials have to be clearly labelled.
Immediately after the arrival of the materials, orders are entered into the system using the material specifications provided. The material is then labelled, stating the client name and the order number assigned to it for processing. If known, the project name and the project number can also be stated on the label.
These temporary labels are wired to the materials and they are left on the objects throughout the galvanising process. The labels are attached in such a way that they will not get stuck in the zinc layer during the galvanising process, and can be removed without difficulty later.
Steel constructors who mark their own materials should check with Rotocoat about which products, markers or chalks they should use.
When markings are also useful after galvanising, for example for assembly purposes, steel constructors will use approaches that involve permanent markings.
This usually means selecting one of three options:
- Deep letter punching. The letters should be high (10-15mm) and deep (≥ 1mm) enough to remain legible after galvanising.
- Welded markings. These markings remain clearly visible but their appearance is generally less pleasing. Furthermore, after the welding, the welding spray should be completely removed in order to guarantee the local quality of the zinc coating.
- Welding labels. Here also, the letters or labels should be large enough and the welding spray should be thoroughly removed.