ASTM A106 ASME SA106 API 5L Welded Gas Transmission Pipeline

ASTM A106 ASME SA106 API 5L Welded Gas Transmission Pipeline

Welded pipes are produced by shaping flat steel (steel plate or steel sheet) to cylindrical shapes through mechanical pressure and then the seam is joined through welding. Quarto plate ( which is also known as reversing mill plate) is largely used in the industry for the production of welded pipes. Moreover, hot-rolled coils are also used as a substrate for the production of welded pipes and tubes. Welded pipes are also known as ERW (Electric Resistance Welded) pipe.
Types of Welded Pipes:
Spiral Welded Pipes
The weld or seam in these pipes is in the form of a spiral. Plate or sheet is shaped into spiral form through using submerged arc welding (SAW) process. These pipes are usually are in large diameters forms and mostly used as long-distance pipelines in the energy sector as well as many other sectors such as structural engineering.
Longitudinal Welded Pipes
In these pipes, the weld is made in longitudinal directions. Plates or sheets are curved and electric resistance arc welding is used in the longitudinal directions to join the seams. When a plate is of higher thickness, longitudinal submerged arc welding is also used for making such pipes.
These pipes are made after curving the steel plate in the form of pipe and performed the welding in a longitudinal direction. Mostly electric resistance welding is performed in the manufacturing of these pipes. LSAW is also used in making these pipes.
Welding Steel Pipes Types
Furnace Weld (FW) or Continuous Weld is a unique weld method to produce pipe with minimum welding defects. The process is comparatively costly. The pipe is welded by heating it in a furnace at the welding temperature followed by extrusion over a mandrel. High-performance pipes like those used in boilers are sometimes made through this process.
Submerged arc weld (SAW) is much common in the industry. The electric arc and weld are completely submerged in the fused granular flux and remain protected from oxidation during the process. In the spiral pipes, it is known as S-SAW or HSAW while in longitudin