What does the term 'forge-welding' describe?

The term 'forge-welding' specifically refers to the process of joining two pieces of metal through the application of heat and mechanical force, typically achieved by hammering or pressing the heated metal together. This technique involves heating the metals to a point where they become malleable, allowing them to bond at the molecular level when force is applied. Forge-welding is one of the oldest methods of welding and is particularly effective for creating strong and durable joints in metalwork.

Other options, although related to metalworking, describe different processes. For instance, cutting metal is a distinct operation that does not involve joining and does not encompass the heating and hammering techniques involved in forge-welding. Additionally, applying a coating to metal surfaces refers to processes like plating or painting, which aim to enhance appearance or protect against corrosion, rather than physically joining materials. Lastly, while metal recycling involves the processing and repurposing of metal materials, it does not pertain to the process of forging or welding. Thus, the focus on the heating and hammering aspect directly identifies forge-welding as a unique method of joining metals.