What type of fittings are typically used to connect copper pipes?

Soldered fittings are the correct choice for connecting copper pipes due to the nature of copper as a material and the traditional plumbing techniques employed. Soldering involves the use of heat to melt a filler metal, which bonds the joint and creates a strong, leak-proof seal. This method is particularly effective for copper systems because it allows the pipes to be joined without expanding or deforming them, leading to reliable and durable connections.

In plumbing, soldering is commonly used for both water supply lines and in situations where a permanent joint is preferred. The process requires specific techniques to ensure that optimal heat is applied without overheating the copper or corrupting the solder joint. This technique also has the advantage of being less prone to leaks compared to some other methods when done properly.

While other types of fittings, such as compression fittings and welded fittings, have their applications, they do not serve as the traditional standard for joining copper pipes. Compression fittings, while convenient and effective for temporary or removable connections, do not rely on heat and solder, making them less favorable compared to soldered joints for long-term plumbing installations.