Composite profile

With mounting plates or comparable objects, a corner should be cut out before welding so that there is a good flow hole. When this is not practical, a hole should be drilled in the corner where the recess was drawn. All the corners in the hollow profiles welded on to the plate should include holes.

Complex objects require careful study to ensure good galvanisation quality. Once again, the simple rule is that air should be allowed to escape and that zinc should be allowed to flow in and out freely. Because the balance of the object cannot be determined before galvanisation takes place, it is not clear what the top and bottom will be. So it is important to drill holes in all corners.

The holes should be drilled in the corners as much as possible.

With this slightly unusual object, air pockets need to be prevented as well and excess zinc has to be allowed to flow out quickly.