Be careful of plate lamination defects

Ultrasonic testing

One of the most serious defects you can find in metal plates is lamination. It can create a long, thin, flat discontinuity within the plate. This can compromise the strength and performance. It is a good idea to check plates before you use them. This can ensure that there are no serious defects like this. Ultrasonic testing (UT) is one of the best methods to use here. It can find and measure the extent of the lamination.

Why does it happen?

Plates are made by running slabs of metal through a series of rollers to gradually reduce the thickness. The process can be hot or cold depending on the metal and requirements. It can involve several passes to create the final plate.

The lamination can occur because of a small discontinuity such as porosity or an inclusion in the slab. When the rolling compresses the metal to reduce the thickness, it can also elongate the flaw. This will follow the direction of the rollers.

Lamination can also happen when folds or layers of plate are rolled together to create a single thickness. It occurs because the rolling does not make the layers bond together. As a result, when you work them, they can separate.

Loss of strength

The lamination, whether it is at the edge of a plate or in the body, can dramatically reduce the strength. When they are significant, laminations can impair the structural and loading performance of the plates. This can allow things like buckling or even full failure.

A lamination defect at the edge of a plate can cause even more issues. For example it can compromise any connections here, including welds. They will have much less integrity because of the discontinuity.

Using ultrasonic testing (UT) to find lamination

Format NDT Ltd can arrange non-destructive testing for many different metal plates, including carbon steels. Our team have the best equipment and a wealth of experience. Most importantly, they can accurately prepare for tests and interpret the results. As a result, we give each client the clearest idea of the number of discontinuities in the metals and their locations.

So, if you want to test metal plates for lamination and other flaws, contact us. We can provide ultrasonic testing (UT) on site or take materials to our lab. With our service you can have confidence that there isn’t a serious defect in your metals.