What does the term 'solvent welding' refer to in pipe repair?

The term 'solvent welding' specifically refers to a process that uses a solvent cement to fuse plastic pipes and fittings. This method involves the application of a chemical solvent that softens the surfaces of the plastic materials being joined, allowing them to meld together and create a strong, integral bond as the solvent evaporates.

This technique is particularly popular in plumbing and construction involving PVC and CPVC pipes due to its effectiveness in forming joints that are not just leak-proof but also maintain their strength under pressure. The precise control over the fusing process enables a seamless connection between pipes, which is critical in various applications where fluid transport is involved.

The other options do not accurately depict the process of solvent welding, as they pertain to different methods of pipe work that do not involve the chemical fusing of plastic materials.