When using copper tubing, which joint method is not typically employed?

Flanging is not typically employed as a joint method for copper tubing because it is more common in processes involving mechanical assembly of piping systems, particularly with thicker materials or when using other types of metal. Copper tubing typically requires methods that create a durable, watertight seal, and while flanging can be used in some scenarios, it is not standard practice for copper.

Soldering is a widely utilized method for joining copper tubing, as it involves creating a joint by melting solder to connect the pieces. Compression fittings are also commonly employed, which provide a quick and effective way to join copper pipes without the need for soldering. Welding can sometimes be used, but it is less common for tubing due to the risk of distorting the thin walls of the copper. Therefore, flanging stands out as the least applicable method for copper tubing connections.