What type of appearance does a cold weld have?

A cold weld is the result of inadequate heat being applied during the welding process, leading to poor fusion of the materials. The appearance of a cold weld is characterized by a rough and irregular surface. This irregularity occurs because the materials have not properly melted and fused together, which prevents the formation of a strong and even joint. Instead, you see uneven textures and potentially some visible gaps or flaws where the surfaces did not adhere correctly. This contrasts with well-executed welds, which typically feature smooth, shiny, and more uniform surfaces due to proper melting and solidification processes.

The other appearances listed, such as shiny and smooth, smooth with feathered edges, and glossy and polished, are characteristics of good-quality welds that have been properly executed, indicating strong bonding and effective heat application.