New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Which of the following methods is not used for steel pipe manufacturing?

1. Type S (seamless)

2. Type L (lap weld)

3. Type E (electric)

4. Type F

The correct answer is: Type L (lap weld)

The method that is not used for steel pipe manufacturing is lap welded, commonly referred to as Type L. Steel pipe manufacturing encompasses various techniques, primarily focused on creating strong, durable pipes suited for transporting liquids and gases. Seamless pipes, identified as Type S, are fabricated without any welding seams, providing superior strength and reliability, especially in high-pressure applications. Electric resistance welded pipes, denoted as Type E, utilize electrical currents to join the edges of the steel, creating a robust, continuous structure suitable for many applications. Type F refers to a form of pipe known as furnace welded, produced by welding steel strip in a continual process with controlled heating. In contrast, lap welding is not a standard method used in the production of steel pipes, as it is associated with other forms of metal joining and can compromise the integrity that is critical for pipe applications. This distinction is essential for understanding the common practices within the pipe manufacturing industry.