E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
Oct. 09, 2024
Straight seam welded steel pipes can be categorized primarily into two types based on their welding processes:
High-Frequency Resistance Welding (ERW) and Submerged Arc Welding (SAWL). Each method has distinct characteristics, applications, and advantages.
High-Frequency Resistance Welding (ERW)
Process Characteristics:
Welding Method: ERW involves cold forming a steel plate into a cylindrical shape and then applying high-frequency
electric current to the edges to induce heat, causing them to fuse without the addition of filler material.
This results in a weld that retains the chemical properties of the base material due to recrystallization during the process
Mechanical Properties: The absence of additional welding materials and the controlled heat application lead to improved mechanical properties,
including high strength and toughness, making ERW pipes suitable for various engineering applications
Applications:
Usage: ERW pipes are commonly used for transporting natural gas, crude oil, refined oil, and pulp over long distances on land.
Their high production efficiency and lower costs make them popular in these applications
Production Efficiency:
Material Source: The raw material for ERW pipes is hot-rolled steel coils,
allowing for continuous assembly line operations that enhance production efficiency while keeping costs low.
Submerged Arc Welding (SAWL)
Process Characteristics:
Welding Method: SAWL employs a submerged arc welding technique where multiple wires are used to create the weld.
This method minimizes heat input, reducing the impact on the heat-affected zone of the parent material.
The process often includes a cold expanding technique that enhances dimensional precision and reduces internal stress.
Mechanical Properties: The multiple wire welding technique allows for better control over the welding process,
which contributes to improved mechanical properties of the finished product.
Additionally, ultrasonic flaw detection ensures that the pipes meet stringent quality standards required for high-pressure applications
Applications:
Usage: SAWL pipes are primarily used in high-voltage underwater pipelines and in challenging
environments such as mountainous regions or areas with extreme conditions. Their superior performance characteristics make them ideal for such demanding applications
Production Efficiency:
Material Source: Unlike ERW, SAWL pipes are produced from hot-rolled steel plates, which leads to higher production costs and lower efficiency compared to ERW processes.
Conclusion
Both ERW and SAWL steel pipes serve crucial roles in various industrial applications.
ERW is favored for its cost-effectiveness and efficiency in land-based transport systems,
while SAWL is preferred for high-performance requirements in extreme environments.
Understanding their differences is essential for selecting the appropriate type based on specific project needs.
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Cast flanges feature rough external shapes but precise dimensions, require minimal machining, and offer low costs; however, they are prone to casting defects (such as porosity) and cracks (often due to inclusions), and their internal structure is suboptimal (resulting in poor grain flow characteristics after cutting).
Authentic is here to help you find the right pipe fittings and flanges for your specific needs.
FAQ
What certifications do your products have?
Our products comply with international standards such as ASTM, ANSI, JIS, DIN, and GB. We also hold various certifications to assure quality and reliability, including ISO 9001.
How can I get some samples?
If you need, we will offer you samples for free, but new customers are expected to pay express charge.
To which country have you supplied your products?
We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru, USA, Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.)
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authentic013@steelpipes-fitting.com
+86 13668807131
Donghe Industrial Zone, Mengcun County, Cangzhou City, Hebei Province
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