The piping products and systems that service industrial applications have had to change and get more complicated as well.
While there are other pipe manufacturing methods, the most common debate in the industry pits electric resistance welded (ERW) steel pipe against seamless (SMLS) steel pipe.
For decades, both ERW and seamless steel pipe production technologies have been in use; however, the methods for producing each have progressed through time. So, which is the best option?
Manufacturing Welded Pipes
Welded pipe begins as a skelp, a long, coiled ribbon of steel. The skelp is cut into a flat rectangular sheet of the desired length. The outer circumference of the pipe will be determined by the width of the sheet’s shorter ends, a value that may be used to compute the pipe’s eventual outside diameter.
The rectangular sheets are run through a rolling machine, which twists the longer sides together to produce a cylinder. A high-frequency electrical current is passed between the edges in the ERW process, making them melt and fuse together.
There are no fusing metals utilised in ERW pipe, and the weld seam cannot be seen or felt. This is in contrast to double submerged arc welding (DSAW), which leaves a visible weld bead that must be removed depending on the application.
Manufacturing techniques for welded pipes have developed over time. The move to high-frequency electric currents for welding is perhaps the most significant advancement. Low-frequency current was employed prior to the 1970s. Weld seams produced from low-frequency ERW were more prone to corrosion and seam failure.
Manufacturing Seamless Pipes
A billet is a solid cylindrical piece of steel that is used to make seamless piping. Billets are punctured through the core using a mandrel while still hot. Rolling and extending the hollow billet is the next stage. The billet is rolled and stretched exactly until it reaches the length, diameter, and wall thickness specified in the customer order.
Some seamless pipe types harden during manufacturing, therefore heat treatment isn’t required afterwards. Others will need to be heated. Check the specification of the seamless pipe type you’re considering to see if heat treatment is required.
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