Spiral Submerged Arc Welded (SSAW) steel pipes are known for their distinctive production process and technical advantages. Below are the key characteristics that define SSAW steel pipe production.
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Uniform Deformation and Minimal Residual Stress During the molding process, the steel plate undergoes uniform deformation, ensuring minimal residual stress and no surface scratches. This results in SSAW steel pipes having a higher degree of flexibility in terms of diameter and wall thickness. Specifically, SSAW is particularly advantageous in the production of high-strength, thick-walled pipes, including small and medium-diameter thick-walled pipes, where it excels compared to other methods in meeting user requirements.
Advanced Double-Sided Submerged Arc Welding (SAW) The use of double-sided submerged arc welding technology allows welding to be done at the optimal position, reducing common issues such as edge errors, welding deviations, and defects. This ensures higher control over welding quality, making the process more reliable.
Comprehensive Quality Inspection The entire production process of SSAW steel pipes is equipped with effective detection and monitoring systems to ensure 100% quality inspection. This guarantees the consistency and reliability of the final product, ensuring that every pipe meets the required standards.
Real-Time Data Monitoring and Control All equipment in the production line is networked with a computer data acquisition system, enabling real-time data transmission. The production parameters are centrally controlled via a central control room, allowing for precise monitoring and adjustment of key process variables to optimize pipe quality.
Strict Raw Material Inspection The raw materials used in SSAW pipe production, including coils, wires, and melts, undergo strict physical and chemical inspections before they are allowed into the production process. This ensures the quality and suitability of the materials for welding and further processing.
Efficient Strip Processing The steel strip undergoes comprehensive preparation before forming, including leveling, trimming, planing, surface cleaning, and pre-bending. This ensures that the strip is in optimal condition for the welding and forming processes, reducing defects and improving the quality of the final product.
Effective Steel Strip Transportation Control The pressure on both sides of the conveyor is monitored and controlled using electric contact manometers, ensuring smooth and efficient transportation of the steel strip. This control helps prevent issues during the forming stage and improves overall production efficiency.
Roller Shape Control The process utilizes either external or internal roller control to shape the steel strip. This step is crucial for maintaining the correct geometry and alignment of the strip as it transitions into the pipe form.
Welding Control System A dedicated welding control device ensures that the welds meet strict quality requirements. It carefully monitors and controls the pipe diameter, alignment, and the weld seam, further enhancing the consistency and precision of the final product.
Stable Welding Quality with Lincoln Welders To maintain stable and high-quality welding, American Lincoln welders are used for both internal and external welding. The single-wire or double-wire submerged arc welding process ensures that the pipe is welded to the highest standards, providing both strength and reliability.
These technical characteristics make SSAW steel pipes highly versatile, durable, and suited to a wide range of applications, particularly where high-quality, thick-walled pipes are required. The combination of advanced technology, stringent quality control, and precision welding ensures that SSAW steel pipes meet the demanding needs of various industries.
LSAW Pipes have a slight advantage over SSAW Pipes. The following points explain why.
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SSAW pipes have greater residual stresses than LSAW pipes. The straight seam submerged arc welded pipe undergoes a uniform expansion process.
The stress concentration phenomenon of SSAW pipe welds belongs to the severe category. SSAW pipes have a larger heat affected zone than LSAW pipes. The heat-affected zone is considered a weak point where failure may begin.
The geometric accuracy of LSAW pipe is better than that of SSAW pipe, which is the key to ease of installation.
LSAW pipe has approximately 60% fewer welds than SSAW pipe.
Brief description and comparison of LSAW, SSAW and ERW pipes
Quality steel pipe is produced by three (3) manufacturing processes: Seamless, LSAW (Longitudinal Submerged Arc Welding) and ERW (Electric Resistance Welding). LSAW and ERW tubes are highly regarded for their wide range of applications. They are widely used in basic solutions and systems, marine construction, structural construction, and various applications in the fields of hydraulic engineering, petrochemical, chemical and power industries, agricultural irrigation, and urban construction.
LSAW pipe comes in two types: longitudinal (single or double straight seam weld, DSAW) and helical (also known as SSAW, HSAW or SAWL). LSAW pipe differs from other LSAW pipes in that LSAW pipe has a seam weld on the inside and outside of the pipe, while the latter has only one seam weld on the outer surface, longitudinal or cross-section.
SSAW and LSAW pipes are manufactured using a common manufacturing process known as the "JCOE and UOE Forming Process". The difference is that SSAW pipes are welded in a helical or helical position while LSAW pipes are welded longitudinally.
The SSAW pipe is wound and welded by steel strip, its rotation direction is inclined to the axis or the center of the pipe, and the weld seam is helical. LSAW pipe is made by forming a steel plate into a cylinder and joining the ends together by straight-line welding.
LSAW pipe diameters typically range from 16" to 60" (406mm to mm). They have good high pressure and low temperature corrosion resistance.
However, CSC Steel can supply pipe with diameters between 1 inch and 167 inches (21 mm and mm) and thicknesses between 3/32 inch and 4 inches (2.1 mm and 100 mm). ESC steel pipe is manufactured using LSAW in maximum diameter and thickness and is highly recommended for load bearing piles, composite wall piles and other applications. In the oil and gas industry, large diameter API 5L LSAW pipe is used to efficiently transport hydrocarbons over long distances.
HSAW (Spiral Submerged Arc Welding) or SSAW pipe diameters typically range from 20" to 100" (406 mm to mm). One of the advantages of SSAW is the possibility of obtaining different diameters
ERW pipe
ERW Tube Forming
SSAW pipe is made from standard size steel strip without cutting. On the other hand, the length of the spiral weld is much longer than the length of the pipe, the cost is higher, and it is prone to cracks, pores, slag inclusions, partial welding, etc.
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