Definition of LSAW Steel Pipe
LSAW steel pipe (Longitudinally Submerged Arc Welding, abbreviated as LSAW) is a professional term for straight seam submerged arc welded steel pipe. It is made of a single medium and thick plate as raw material. The steel plate is pressed (rolled) into a tube billet in a mold or a forming machine, and is produced by double-sided submerged arc welding and expanding the diameter.
SSAW, or Spiral Submerged Arc Welded steel pipe, is produced by coiling a steel strip and welding it in a spiral pattern. This method allows for longer pipe sections and greater flexibility in manufacturing.
Key Features of SSAW Steel Pipe
The welding seam follows a spiral path, distributing stress evenly.
It is more cost-effective compared to LSAW steel pipes.
The production process allows for longer pipe lengths.
Difference between LSAW steel pipe and SSAW steel pipe are followings below:
The spiral pipe welding process is also submerged arc welding (SSAW for short). The difference between LSAW and ERW is the welding process. Submerged arc welding (SAW) requires the addition of a medium (welding wire, flux), while ERW does not. ERW is melted by medium frequency heating. Steel pipes can be divided into two categories according to the production method: seamless steel pipes and welded steel pipes.
1. The welding process is concerned: a consistent spiral welded pipe and Longitudinal welding, straight seam steel pipe will inevitably have a lot of T-weld, and therefore the probability of the existence of welding defects has greatly improved, and welding residual T welds stress is large, the weld metal are often in three-dimensional stress state, increases the likelihood of cracks. Furthermore, according to the provisions of submerged arc process, each weld shall have the arc at the place and extinction, but in each Longitudinal seam welding ring, unable to meet the conditions, which may have a place in the extinction more weld defects.
2. When the pressure in the pipe to withstand, typically produces two main stress on the wall, that the radial and axial stress stress δ . Weld resultant stress δ, wherein the helix angle of the weld.
3. Spiral Weld Pipe degree helix angle is generally, therefore synthetic spiral weld stresses are the principal stresses. Under the same operating pressure, spiral pipe of the same diameter than the Longitudinal wall thickness can be reduced.
4. The hydrostatic burst strength: by the relevant comparison test, to verify the yield pressure and burst pressure measured and theoretical values spiral pipe and Longitudinal basic agreement, deviation close. But neither the yield stress or burst pressure, spiral pipe were lower than Longitudinal. Blasting test also shows spiral steel hoop blasting mouth deformation rate significantly greater than the Longitudinal. It was thus confirmed, spiral pipe plastic deformation than Longitudinal, blasting the mouth is generally confined to within a pitch, which is spiral weld for expansion gap played a powerful role in binding due.
5. Toughness and fatigue strength: pipeline development trend of large diameter, high strength. With the increase of the diameter of the pipe, the steel grade increase, resulting in greater the ductile fracture tip steady expansion trend. Spiral pipe and Longitudinal although the same as a level, but the spiral steel pipe has a high impact toughness.
6. Because of the transfer line output volume changes: in actual operation, the pipe is subjected to random alternating loads of action. Learn low cycle fatigue strength of steel, judging life of the pipeline is of great significance.
7. Press the measuring result: fatigue strength spiral steel seamless and ERW pipe with the same test data and seamless pipe distribution and resistance in the same area, while Longitudinal submerged arc than the average higher.
Key Differences
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Feature
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LSAW Steel Pipe
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SSAW Steel Pipe
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Welding Seam
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Straight
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Spiral
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Manufacturing Method
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Welded from a steel plate
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Welded from a steel coil
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Strength
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High, suitable for high-pressure applications
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Lower, used for general pipelines
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Diameter Range
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Medium to large
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Large to extra-large
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Applications
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Oil and gas pipelines, structural projects
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Water transport, piling, construction
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Summary
LSAW steel pipes and SSAW steel pipes have their own advantages and disadvantages. When choosing, factors such as pipeline use, pressure requirements, and cost budget should be considered.
LSAW steel pipes are suitable for high pressure and high strength requirements, especially for oil and gas, marine engineering, etc.
SSAW steel pipes are suitable for large-diameter and long-distance transportation, with lower costs and stronger economy.
Want to know more about the specifications, prices, and production processes of LSAW and SSAW steel pipes? Welcome to contact us for professional advice
Baowi Steel specializes in manufacturing high-quality LSAW and SSAW steel pipes for various industries, including oil and gas, construction, and infrastructure.
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