A metal piece that is CHASED is cleaned (ground, filed or sanded) to eliminate the slight imperfections that may result from the casting or shell building process. For example, on larger metal sculptures, where assembly of cast sections is required, chasing is essential to take down weld line formed by the joining of two planes.

Metal chasing usually starts with large electric or pneumatic grinders to remove the bulk of the unwanted metal. Then, more refined and smaller tools such as die and pencil grinders are used to re-create the artist’s subtle surface texture.

See Internet sites below.

I think this works in the context of what you have provided.

Hope this helps.

Also: www.meganationalgallery.com/metal_chasing.htm