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Tailored Welded Stainless Steel Tubes:
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Stainless Steel Welded Tube is a type of tube used for transporting liquids and gases and is made of stainless steel sheets that have been welded and processed. It has excellent corrosion resistance, high strength, a beautiful surface, and long service life. Stainless steel welded tube is used in many fields, such as food, beverage, medicine, chemical industry, shipbuilding, petrochemical, aerospace, construction, etc. According to different applications, stainless steel welded tubes can be divided into many types such as general welded tubes, heat exchanger tubes, condenser tubes, galvanized welded tubes, oxygen-blowing welded tubes, wire casing, metric welded tubes, roller tubes, deep well pump tube, automobile tube, transformer tube, electric welded thin-walled tube, electric welding Shaped tube and spiral welded tube. The production process of stainless steel welded tubes mainly includes cold-rolled, cold-drawn, hot-rolled, and hot-drawn methods, among which the stainless steel seamless tube produced by the cold-rolled and cold-drawn process is of higher quality and suitable for high requirements.
The process of producing Stainless Steel Welded Tubes can usually be achieved by both Cold Rolling and Cold Drawing.
Select suitable stainless steel sheet and coil material as raw material and carry out quality inspection and surface treatment, such as removing oil and stain, oxidation of skin, etc.
The surface-treated stainless steel sheet and coil material is fed into the cold rolling mill for forming. The cold rolling mill is mainly composed of a roll forming machine, a roll straightening machine, and a roll cutting machine. In the process of cold rolling, the stainless steel sheet and coil material are formed into a round tube core and pressed to meet the required size and wall thickness after several roll presses.
After cold roll forming, the stainless steel tube core is welded by high-frequency induction welding and TIG welding to form a complete stainless steel welded tube.
The welded stainless steel welded tube is subjected to post-treatment processes such as oxidation removal, pickling, and polishing to meet the requirements of product quality standards.
Select suitable stainless steel billets for quality inspection and surface treatment.
The stainless steel billet is sent to the cold drawing machine for drawing. In the cold drawing process, the stainless steel billet is gradually drawn into stainless steel welded tube of the required size and wall thickness by increasing the number of draws and reducing the size of the draw force.
After cold drawing and forming, the stainless steel welded tube is welded by high-frequency induction welding, TIG welding(Tungsten Inert Gas welding), etc. to form a complete stainless steel welded tube.
The welded stainless steel welded tube is subjected to post-treatment processes such as oxidation removal, pickling, and polishing to meet the requirements of product quality standards.
Cold rolling and cold drawing are both important processes for making welded stainless steel tubes, and they are similar in that both are used to make welded tubes by plastic deformation of stainless steel billets.
The difference is that cold rolling and cold drawing have different plastic deformation methods. Cold rolling is the plastic deformation of a stainless steel billet by roll pressing, which is suitable for manufacturing larger diameter and thicker wall welded tubes with high productivity and lower cost. Cold drawing, on the other hand, is the plastic deformation of stainless steel billets by drawing, which is suitable for manufacturing smaller diameter and thinner wall seamless tubes with higher production cost and technical difficulty.
In addition, cold rolling and cold drawing for the physical properties of stainless steel materials and surface quality will also have an impact. Cold drawing can improve the tensile strength and hardness of stainless steel materials, but also prone to cracks, pockmarks, and other surface defects. Cold rolling, on the other hand, can improve the surface finish and mechanical properties of stainless steel materials, but its tensile strength and hardness are slightly inferior compared to cold drawing.
General stainless steel welded tube is made of stainless steel sheet that is roll formed and then welded, which is suitable for a variety of industry fields, such as chemical, petroleum, construction, etc. With smooth surface and good corrosion resistance and welding performance, plain welded tubes are widely used in various applications.
Heat Exchanger Tubes and Condenser Tubes are used in heat exchangers and condensers which have good corrosion resistance and heat transfer properties. The tubes can also withstand high temperatures and pressures and can be used in a variety of industrial applications.
Galvanized Welded Tube is covered with a layer of zinc to improve its corrosion resistance. Galvanized stainless steel welded tube is commonly used in the manufacture of projects with stringent requirements, such as buildings, bridges, highway tunnels, etc.
Oxygen-blowing welded tube is manufactured by using oxygen blowing equipment to inject a certain amount of oxygen into the welded position to enhance the strength of the weld seam. This kind of welded tube is more widely used, such as for chemical industry, ships, marine and other fields.
Wire Casing is a type of welded tubing used in electrical conduit, which is typically used for maintenance and wiring and has good corrosion resistance and electrical insulation properties.
Metric welded tubing is stainless steel welded tubing produced to international standards and made using metric dimensional standards. This type of pipe is commonly used in the import and export trade and is usually made using DN size standards.
Roller tube is a special type of welded tube that is used in the manufacture of shaft and support assemblies for conveyor belts and contour plates. This tubing has excellent wear and corrosion resistance and is used in a variety of industrial applications.
Deep well pump tube is a type of stainless steel welded tubing used for pumps and oil pumps that typically requires tubing with high strength, corrosion resistance and high temperature resistance. The manufacture of deep well pump tubes usually requires strict quality inspection to ensure that they meet the standards and requirements.
Automotive tubing is stainless steel welded tubing used in automotive manufacturing. It has characteristics such as corrosion resistance, tensile strength and fatigue resistance, and is usually used in the manufacture of automotive exhaust systems, oil circuit systems, brake systems, etc.
Transformer tube is a stainless steel welded tube used in power transformers, which usually requires the tube to have excellent electrical conductivity and corrosion resistance. The manufacture of this tube requires a special process to ensure its quality and performance.
Electrically welded thin-walled tube is a special type of welded tube with thinner wall thickness than ordinary welded tube and is suitable for manufacturing fine parts and high-precision equipment. It has good welding performance, corrosion resistance and strength, and is usually used for manufacturing fine products such as furniture, toys and lamps.
Electric welding shaped tube are stainless steel welded tubes with non-circular shape of the welded formed tubes. They are usually used to manufacture components for special occasions, such as bridges, highway tunnels, airports, etc.
Spiral welded tube is a kind of stainless steel welded tube manufactured by spiral coiling method. It has characteristics such as high strength, corrosion resistance and high temperature resistance, and is usually used for liquid and gas transmission pipelines such as oil, natural gas and water.
Stainless steel welded tube is favored for its outstanding corrosion resistance. Stainless steel welded tube is made of high-quality stainless steel material, the main components of which include chromium, nickel, and other alloying elements. These elements give stainless steel welded pipes the ability to resist oxidation, corrosion, and acid and alkali attack.
First, the addition of chromium makes stainless steel welded tube form a dense oxide film, known as the “passivation layer”, which can effectively isolate the external environment and metal contact, thereby preventing corrosion and rusting. Secondly, the addition of nickel enhances the corrosion resistance of stainless steel, so that it can maintain stability and durability in acidic and alkaline media.
Stainless steel welded tube has a wide range of corrosion resistance to common corrosive media, such as moisture in the air, water, acids, alkalis, and salts. Its performance in humid, acidic, alkaline, and high-temperature environments is excellent.
Huaxiao stainless steel tube suppliers offer high quality stainless steel welded tube products to meet customers’ needs and provide related technical support and after-sales service.
The presence of chromium increases the hardness and strength of stainless steel welded tubes. Chromium provides additional protection by forming a dense oxide film (passivation layer), which increases the tensile and torsional strength of the stainless steel welded pipe.
Second, the addition of nickel further increases the strength of the stainless steel welded pipe. Nickel increases the toughness and plasticity of the crystals, resulting in better impact and tensile resistance of the welded pipe.
In addition, the addition of molybdenum can also significantly improve the strength of stainless steel welded tubes. The presence of molybdenum helps improve the corrosion and high temperature resistance of welded tubes while providing additional hardness and strength.
Stainless steel welded tubes have good malleability and machinability, which makes them ideal for many engineering and manufacturing applications. The following are the main characteristics of the malleability and machinability of stainless steel welded pipes:
Plasticity: Stainless steel welded tube has good plasticity and can be plastically deformed by methods such as hot working and cold working. It can be rolled, stretched, bent and forged to suit a variety of shapes and sizes. This plasticity allows stainless steel welded pipe to be applied flexibly in the manufacturing process and allows complex shapes and curves to be achieved.
Machinability: Stainless steel welded tube is easy to machine and cut for a variety of machining methods, such as cold cutting, hot cutting, drilling, turning and milling. It can be precisely machined in a variety of processes to meet specific design and dimensional requirements. The machinability of stainless steel welded pipe makes it widely used in manufacturing, including the manufacture of parts, components and assemblies.
Stainless steel welded tube has good heat resistance properties and can maintain stable performance in high temperature environments. It can withstand high-temperature processing and use conditions without easily deforming or losing its physical and mechanical properties. This heat resistance makes stainless steel welded pipe ideal for many high-temperature applications, such as the petrochemical, energy, and automotive industries.
Smoothness: The surface of stainless steel welded pipe is polished or polished to have smoothness and finish, which gives it a bright metallic luster and gives a neat, high-quality feeling.
Color Stability: Stainless steel welded pipe has good corrosion resistance and can resist oxidation, corrosion and discoloration, so its color stability is very high, and it can still maintain its original bright appearance after a long time of use.
Design Diversity: Stainless steel welded pipes can be treated with different surface treatments, such as mirror polishing, brushing, brushing sand, etc., to meet different design and decoration requirements according to customer needs. This makes stainless steel welded tubes have a wide range of applications in indoor and outdoor decoration, architecture and design fields.
Clean and Easy Care: The smooth and flat surface of stainless steel welded pipe is not easy to accumulate dust, dirt and bacteria, and is easy to clean and care for. This makes stainless steel welded tubes widely used in places that require hygiene and easy cleaning, such as food processing, medical equipment, etc.
Material can be Separated: Stainless steel welded pipe can be recycled by methods such as melting and smelting. During the recycling process, the welded part can be cut and separated for the next step of reuse.
Recycling: Recycled stainless steel welded pipes can be reprocessed and manufactured into new products, such as stainless steel piping, components, household items, etc. This recycling reduces the need for raw materials, energy consumption, and environmental impact.
Energy Savings: Recycling stainless steel welded pipes requires relatively little energy, which can result in significant savings in energy consumption and carbon emissions compared to producing from new raw materials.
Environmentally Friendly: The recycling and reuse of stainless steel welded pipes can reduce waste and pollutant emissions and lower the demand for natural resources. This helps to protect the environment and promote sustainable development.
Cracks, porosity, inclusions, and other defects may exist inside the weld. For welding technology, Gas Tungsten Arc Welding (such as MIG, TIG, etc.) is usually used. For material, usually use stainless steel wire or stainless steel welding rod.
When welding, improper operation or unreasonable process may result in raised or sunken welds. Encounter this situation should promptly check the stability of the welding equipment, adjust the welding process parameters and welding technology.
During the welding process, welding deformation may occur, resulting in an uneven weld seam and affecting the welding quality. At this time, you should promptly change the welding process, adjust the welding sequence, as well as the use of support, preheating and other techniques to control the deformation.
Visual inspection of the surface of the welded pipe, including checking whether the surface has obvious wear, cracks, dents, bubbles, and other defects. The exterior inspection is a simple and effective inspection method, but it cannot find internal defects in the weld.
The internal inspection of the welded pipe using an ultrasonic probe finds internal defects, such as cracks and porosity. Ultrasonic inspection is a fast, accurate, non-destructive inspection method that can find very small defects.
The use of X-ray through the welded parts to detect the quality of the weld. x-ray inspection can find defects inside the weld, but the detection of small defects is less satisfactory, while requiring specialized equipment and professional technicians.
A ferromagnetic powder is applied to the surface of the weld and the quality of the weld is determined by observing defects in the powder, such as cracks and bubbles. Magnetic powder detection is a simple and practical detection method, but only for welds of ferromagnetic materials.
The weld seam is inspected using the eddy current induction principle. By detecting changes in eddy currents, defects in the weld area, such as cracks, porosity, etc., are found. Eddy current inspection is suitable for detecting welds of various materials, but may be less sensitive to deeper defects.
In oil extraction, stainless steel welded tube is used as oil well casing and oil pipe, and its corrosion resistance ensures the long-term use of the pipe. At the same time, stainless steel welded tube can also withstand high pressure and high temperature conditions for oil and gas transmission, ensuring the safe and stable supply of oil and gas. In oil transportation and storage, stainless steel welded tube is widely used in oil transmission pipelines and storage tanks. Its corrosion resistance can resist the acidic and corrosive substances in oil and gas, ensuring the safety and reliability of the transmission pipeline. As a reliable stainless steel tube suppliers, we are committed to providing high quality stainless steel welded pipe products to meet the needs of the oil and gas industry for pipeline materials.
In chemical production, stainless steel welded tube is widely used to transport various types of liquids and gases. Its corrosion resistance can resist the erosion of chemicals, acids, and corrosive media, ensuring the safety and stability of the chemical production process. Stainless steel welded tubes can also withstand high pressure and high-temperature conditions for fluid transportation, to meet the requirements of the chemical process. In chemical storage and transportation, stainless steel welded tube is widely used in storage tanks, pipelines, and installations. Its corrosion resistance ensures the safety of stored liquids and gases, effectively preventing leakage and contamination. Stainless steel welded tubes are also able to resist corrosive factors common in the chemical industry and extend the service life of piping systems. As a professional stainless steel tube suppliers, we are committed to providing high-quality stainless steel welded pipe products for the chemical industry.
In food processing, stainless steel welded tube is widely used for food handling, storage and transportation. It does not release harmful substances and does not affect the taste and quality of food, ensuring food safety and hygiene. Stainless steel welded tube has good corrosion resistance and can resist acids and corrosive media in food, keeping the pipeline clean and hygienic. In beverage production, stainless steel welded tube is widely used in the processing, storage and transportation process of beverages. Its excellent corrosion resistance and tasteless and odorless properties ensure the hygiene and quality of beverages. Stainless steel welded tube is also able to withstand fluid transportation under high pressure and high temperature conditions, meeting the requirements of the beverage production process. As a professional stainless steel tube suppliers, we offer stainless steel welded pipe products that meet international standards and sanitary requirements.
In medical equipment manufacturing, stainless steel welded tubes are used to make various pipes and connections, such as infusion piping, oxygen piping, suction piping, etc. Stainless steel welded tube has excellent corrosion resistance to resist chemicals and corrosive media in the medical environment, ensuring the reliability and long-term use of the piping. Stainless steel welded tube also has good surface finish and burr-free characteristics, which is conducive to the cleaning and sterilization of medical equipment. Its high strength and excellent sealing performance can meet the requirements of medical equipment for the use of high pressure and high temperature conditions. In addition, stainless steel welded tubes have good plasticity and processability, which can be customized according to the needs of different medical equipment. As professional stainless steel tube suppliers, we provide stainless steel welded tube products that meet international standards and the requirements of the medical industry.
In construction, stainless steel welded tubes are commonly used for structural support and piping systems in buildings, such as stair handrails, railings, bridges, roof structures, etc. Its high strength and corrosion resistance ensure the structural stability and long-lasting durability of buildings. At the same time, stainless steel welded pipe has excellent seismic performance, which can meet the safety needs of buildings in natural disasters such as earthquakes. In terms of decoration, stainless steel welded pipes are widely used in indoor and outdoor decoration projects. Stainless steel welded pipes can be produced in various shapes and designs, such as handrails, railings, door handles, decorative pipes, etc., adding unique beauty and style to buildings and interior decorations. As a professional stainless steel tube suppliers, we are committed to providing high quality stainless steel welded pipe products for the construction and decoration industry.
According to the shape classification, stainless steel welded tubes can be divided into various types, the common ones include the following:
Stainless Steel Round Tube: This is the most common type of stainless steel welded pipe with a round cross-sectional shape, which is suitable for various application scenarios, including construction, decoration, petrochemical, food processing, etc.
Stainless Steel Square Tube: This welded tube has a square or rectangular cross-sectional shape, has a high load-bearing capacity and elegant appearance, and is commonly used in construction, structural engineering, and furniture manufacturing.
Stainless Steel Oval Shaped Welded Tube: The cross-sectional shape of this welded tube is oval, which has a unique appearance and design, and is often used in decoration, furniture manufacturing and automotive industry, etc.
Irregular Shape Welded Tube: In addition to the above common shapes, irregularly shaped stainless steel welded tubes, such as trapezoidal, hexagonal, etc., can also be made to meet specific needs for special design requirements.
Stainless steel welded tube and stainless steel seamless pipe are two common types of stainless steel tubes, and the following differences exist between them:
Manufacturing Process: Stainless steel welded tube is made by curling and welding stainless steel sheets or strips through a welding process, while stainless steel seamless tube is made directly from whole stainless steel through a hot-rolled or cold-drawn process, without welding.
Welded Seams: The fabrication process of stainless steel welded tube produces welded seams, while stainless steel seamless tube has no welded seams and its inner and outer surfaces are smooth and continuous.
Strength and Sealing: Stainless steel welded tube may be slightly less strong than stainless steel seamless tube due to the heat effects of the welding process and the presence of welded seams. In contrast, stainless steel seamless pipe has better sealing performance due to the absence of welded seams.
Cost: In general, the manufacturing cost of stainless steel welded tube is relatively low, while the manufacturing cost of stainless steel seamless tube is high.
There are some basic steps and precautions that need to be followed to weld stainless steel tubes, the following are the general methods of welding stainless steel tubes:
Preparation: Make sure the surface of the welded area is clean and remove dirt, grease and oxides. Select the appropriate welding electrode or filler material, and choose the appropriate welding method according to the stainless steel material and specifications.
Mounting and Positioning: Mount the stainless steel tube to be welded on the welding equipment and position the welding position correctly.
Set up the Welding Equipment: Set the proper welding current, voltage and speed according to the selected welding method and material.
Start Welding: Place the welding electrode or filler material in contact with the stainless steel pipe and start welding. Take care to maintain a steady welding speed and uniform welding pressure.
Control the Welding Temperature: Stainless steel has a low melting point and thermal conductivity, so the welding temperature needs to be controlled to avoid overheating that may cause discoloration or oxidation of the metal.
Pay Attention to Welding Position: During the welding process, make appropriate position changes as needed to ensure uniform and complete welding.
Inspection and Cleaning: After welding is complete, inspect the quality and integrity of the weld. If necessary, clean the weld area of residue and weld slag.
To cut stainless steel tube, there are several methods that can be used:
Abrasive Cutting: This method involves using an abrasive cutting wheel or disc, such as a diamond or carbide-tipped blade, to cut through the stainless steel tube. The cutting wheel rotates at a high speed and grinds away the material, creating a clean cut. This method is commonly used for thinner-walled tubes.
Sawing: Sawing is another common method for cutting stainless steel tubes. It involves using a hacksaw, reciprocating saw, or bandsaw equipped with a blade suitable for cutting stainless steel. The saw blade cuts through the tube by reciprocating or rotating, creating a precise cut.
Tube Cutters: Tube cutters are specialized tools designed specifically for cutting tubes. They typically have a cutting wheel that scores the surface of the tube, and then the tool is tightened to gradually apply pressure and cut through the tube. Tube cutters are commonly used for smaller-diameter tubes.
Laser Cutting: Laser cutting is a precise and efficient method used for cutting stainless steel tubes. It involves using a focused laser beam to melt and vaporize the material along the desired cutting path. Laser cutting offers high accuracy and can be used for complex shapes and thicker-walled tubes.
Waterjet Cutting: Waterjet cutting utilizes a high-pressure jet of water mixed with abrasive particles to cut through stainless steel tubes. This method is versatile and can handle various thicknesses and shapes of tubes, providing clean and precise cuts.
When cutting stainless steel tubes, it is important to use appropriate safety equipment, such as gloves and eye protection, and to ensure that the tube is securely clamped or held in place to prevent movement during the cutting process. Additionally, selecting the appropriate cutting method depends on the specific requirements of the project, including the tube diameter, wall thickness, and desired cut precision.
The service life of stainless steel welded tube depends on several factors, including the following:
Material Quality: Choosing high-quality stainless steel materials can improve the service life of welded tubes. Commonly used stainless steel materials include 304, 316, etc., which have high corrosion resistance and high-temperature resistance.
Environmental Conditions: The service life of stainless steel welded tubes may vary under different environmental conditions. For example, in acidic, alkaline, or salt-corrosive environments, stainless steel welded pipe may corrode more quickly, affecting its life.
Use and Maintenance: Proper use and maintenance can extend the service life of stainless steel welded tubes. Regular cleaning of the pipe surface to avoid the accumulation of corrosive substances or dirt can reduce the risk of corrosion. In addition, avoiding excessive crushing or damage to the pipe is also key to maintaining its life.
Transportation and Installations: Proper handling and protection of welded pipe during transportation and installation can reduce the risk of potential damage and corrosion. Use the proper tools and methods for pipe installation and ensure that the connections are sealed and secure.
To maintain the performance and appearance of stainless steel welded tubes, the following are some common care and maintenance recommendations:
Regular Cleaning: Clean the surface of stainless steel welded tube regularly using a mild detergent and a soft cloth or sponge to remove dirt and impurities. Avoid using cleaners that contain chlorine or acidic ingredients that can damage the stainless steel surface.
Avoid Scratches: Avoid using cleaning tools that are harsh or abrasive to avoid scratching the stainless steel surface. Give preference to soft cloths or sponges and ensure that cleaning is done in the direction of the grain.
Prevent Corrosion: Avoid prolonged exposure to strong acid, alkali or salt corrosive environments. If exposed to these substances, promptly rinse with water and dry thoroughly.
Prevent Dirt Buildup: Promptly remove grease, stains or other dirt from the surface of the welded tube. Dirt buildup can lead to corrosion or damage.
Periodic Inspection: Periodically inspect the surface of the welded pipe for any abnormalities or damage. If corrosion, scratches or other problems are found, appropriate measures should be taken to repair or replace them in a timely manner.
Pay Attention to the Use Environment: According to different application environments, choose suitable stainless steel materials and surface treatment to improve the corrosion resistance and durability of the welded tube.
Avoid Collision and Extrusion: Avoid violent collision or extrusion of the welded tube to avoid shape deformation or damage.
Proper Storage: Store welded tubes properly and avoid contact with other metal materials to prevent electrochemical reactions. Keep dry and ventilated when storing and avoid prolonged exposure to moisture or high humidity.
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