Steel pipes are crucial components in various industries, from construction to oil and gas transportation. Two common types of welded steel pipes are Electric Resistance Welded (ERW) pipes and Double Submerged Arc Welded (DSAW) pipes. While both serve similar purposes, they have distinct characteristics that set them apart.
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Process:
The social occasion system is one of the essential capabilities among ERW and DSAW steel pipes. Every technique involves an interesting strategy for overseeing joining steel strips or plates to move toward a line, accomplishing various qualities and cutoff points.
Electric resistance welding (ERW) is used to create ERW pipes. In this method, a continuous steel strip is continuously formed into a cylinder by passing through a series of rollers. As the edges of the strip join together with an electric current, they are heated to a high temperature. After that, the warmed edges are pressed with basic force to form a production weld that runs the length of the line.
The ERW interaction makes it possible to produce lines quickly and effectively. The pipe moves through the production line at a constant rate because welding takes place in a continuous line. The improvement of lines with additional humble estimations, typically some place in the scope of 2 and 24 inches, and wall thicknesses of up to around 0.5 inches are perfect for this methodology.
Then again, DSAW pipes are made utilizing a cut down twist welding process, which is basically not precisely comparable to the ERW methodology. The first step in the DSAW process is to cylinder-form steel plates or wide strips. After that, the edges of the plate or strip are prepared for welding by inclining, usually to guarantee true weld penetration.
The welded line that is simultaneously welded from within and outside is referred to as "twofold" in DSAW. Two welding heads, one inside the line and one outside, are used to accomplish this. A layer of granular transition that covers the welding bend protects the weld pool from environmental contamination and settles it.
An endless wire cathode is worked into the joint between the molded line's edges during the DSAW cycle. An extraordinary electrical flow passes through this wire, creating a circular segment that liquefies the wire as well as the line's edges. As it cools, the molten metal from the wire and the edges of the pipe come together to form a strong weld. The melted progress that covers the weld area forms a protective slag that is removed from the weld.
Compared to ERW pipes, the DSAW method permits the production of pipes with thicker walls and larger diameters. DSAW pipes typically have breadths ranging from 16 crawls to more than 100 inches, with wall thicknesses of up to a few inches. This makes DSAW pipes reasonable for applications that require enormous width, high-strength pipes, as basic oil and gas pipelines.
The DSAW collaboration's capacity to convey high-strength welds with fantastic invasion is one of its primary advantages. The robustness and uniformity of the weld across the pipe wall thickness are guaranteed by double-sided welding. Additionally, the lowered curve method allows for higher intensity inputs when welding thicker materials, which can be advantageous.
Length:
Another area where ERW and DSAW pipes differ from one another is the length of the lines that can be delivered.
ERW pipes typically come in continuous lengths that are longer than those used in DSAW pipes. The ERW cycle is nonstop, so lines can be made with lengths up to around 80 feet or significantly longer now and again. These longer lengths may be advantageous in some applications because they require fewer field welds during installation, potentially saving time and money.
As opposed to ERW pipes, DSAW pipes are ordinarily made in more limited lengths. DSAW pipes ordinarily have a length of around 40 feet, yet they can likewise be up to 60 feet. The assembling system and the hardware that is used are primarily responsible for the DSAW pipes' maximum length.
The DSAW method involves forming steel plates or wide strips into cylinders prior to welding. The greatest length of DSAW pipes that can be delivered successfully not entirely settled by the size of the steel plates or strips as well as the capacities of the framing and welding hardware. Also, twofold sided welding requires admittance to both within and beyond the line, which can be more challenging to get with incredibly lengthy areas of line.
Nevertheless, it is essential to keep in mind that, despite the fact that individual DSAW pipe sections may be shorter, they can be joined together in the field to produce pipelines of any required length. For some applications, the limitation on individual line length is frequently overcome by the capability to deliver pipes with wider widths and thicker walls.
Detection:
Quality control and defect detection are crucial aspects of pipe manufacturing, and the methods used can vary between ERW and DSAW pipes due to their different production processes.
For ERW pipes, several non-destructive testing methods are commonly employed to ensure the integrity of the weld and the overall pipe quality. One of the primary methods used is ultrasonic testing (UT). In many modern ERW pipe mills, ultrasonic testing is performed in-line during the production process. This allows for real-time detection of weld defects such as lack of fusion or inclusions.
Visual inspection and dimensional checks are also important parts of the quality control process for ERW pipes. These checks ensure that the pipes meet the required specifications for diameter, wall thickness, straightness, and overall appearance.
DSAW pipes, due to their larger size and different welding process, often require a more extensive array of testing methods. Like ERW pipes, ultrasonic testing is a key method used for DSAW pipes. However, due to the thicker walls and larger diameters of DSAW pipes, more sophisticated ultrasonic equipment may be required. Phased array ultrasonic testing (PAUT) is often used for DSAW pipes as it can provide more detailed imaging of the weld and pipe body.
Radiographic testing (RT) is another important method used for DSAW pipes. This technique uses X-rays or gamma rays to create images of the weld, allowing for the detection of internal defects such as porosity, inclusions, or lack of fusion. Radiographic testing is particularly useful for thick-walled pipes where ultrasonic testing might have limitations.
Magnetic particle inspection (MPI) is often used to detect surface and near-surface defects in DSAW pipes. This method is effective for finding cracks, seams, and other discontinuities that might not be visible to the naked eye.
Like ERW pipes, DSAW pipes also undergo hydrostatic testing to verify their pressure-bearing capability. However, due to their larger size and often higher pressure ratings, the hydrostatic testing equipment for DSAW pipes may need to be more robust.
DSAW Steel Pipe supplier:
When it comes to sourcing high-quality DSAW steel pipes, choosing a reliable and experienced supplier is crucial. One such supplier is the Longma Group, which offers a comprehensive range of pipes that meet various international standards.
The Longma Group supplies DSAW steel pipes that comply with standards such as API 5L, ASTM A53, ASTM A500, ASTM A252, and ASTM A795. These standards ensure that the pipes meet specific requirements for chemical composition, mechanical properties, and dimensional tolerances, making them suitable for a wide range of applications.
By adhering to these internationally recognized standards, the Longma Group demonstrates its commitment to quality and reliability. Their DSAW steel pipes are manufactured using advanced technology and undergo rigorous quality control measures to ensure consistency and performance.
If you're in the market for DSAW steel pipes and are considering your options for manufacturers, you can reach out to the Longma Group at info@longma-group.com. Their team can provide detailed information about their product range, specifications, and how their pipes might meet your specific project requirements.
