New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Which of the following is not a method that PVC pipe can be joined?

1. Threading

2. Cementing

3. Welding

4. Grooved joints

The correct answer is: Welding

Cementing is a legitimate method used to join PVC pipe, as it utilizes solvent cement that chemically fuses the pieces together, creating a strong bond. Threading is typically not applicable to PVC because it's a plastic material that doesn't lend itself well to threaded fittings, which are common in metal piping systems. Grooved joints are another alternative, but they involve using a grooved fitting and a rubber gasket for connection, which is less common with PVC. Welding, on the other hand, is a process associated with joining thermoplastics but is not a method utilized for PVC piping. PVC materials are joined primarily through solvent cement because they do not melt and fuse like metals do through welding. Thus, welding does not apply to PVC pipe joints, confirming that it is the method that cannot be used for joining PVC pipe effectively.