Welding process of straight seam steel pipe

2023-12-18 15:01:10

What is submerged arc welding? The so-called submerged arc welding is the use of a kind of granular welding flux. During computer welding, the weld is buried to cover the surface, and the particles are fused at the welding site with welding wire for connection. And the appearance is especially smooth and beautiful,

There is also a kind of square steel pipe called resistance welding, resistance welding is the use of current through the welding parts and contact places to generate resistance to heat. The weldment is heated locally to a plastic or melting state and then welded under pressure. The welding process has high efficiency, small welding deformation, no additional welding materials, and it is easy to control.

The difference between the spiral steel pipe and the straight welded steel pipe is that one is transverse walking welding, and the other is rotating walking welding, but the welding process is the same, both use granular flux, but the spiral steel pipe is a generally thin wall, so it is easier to weld. In production, efficiency is far more than the straight steel pipe efficiency.

At present, most straight-seam steel pipes are welded by submerged arc welding, which is generally used for welding with a diameter above 406mm. With the development of society and science and technology, the current production is a line of automation. Now let's talk about the production flow. After the circle is formed, the gap is large and the welding is not good for connection. After a joint is made, the first welding is performed after the joint, and the submerged arc welding is started below.

Submerged arc welding is also a welding method that uses an arc as a heat source. In submerged arc welding, the arc burns under a layer of melting flux covered by particles, and the arc does not leak out. Hence, the metal electrode used in submerged arc welding is continuous wire feeding.

Submerged arc welding has automatic submerged arc welding and semi-automatic submerged arc welding two ways, one wire feeding, and arc movement are automatically completed by the special head, and the kind of wire feeding is completed by the machine, in the welding process, the flux spread in the front of the arc by the funnel, welding after the flux is not melted can be automatically recovered by the flux recovery device or manual cleaning recovery.

This is the general welding process and process of submerged arc welding. After welding forming, submerged arc welding guided bending test is carried out, which is the inspection of the weld. After the inspection is correct, X-ray flaw detection and wave flaw detection are carried out, and the finished product can be shipped after the inspection.

The welding process of straight-seam welded pipe is also called straight-seam steel pipe in the market. There are many kinds of welding processes for welded pipes. There is a straight seam welding process, that is, the whole pipe is a straight seam. The other is submerged arc welding, which is a kind of welding flux, also known as flux, which is automatic. When the steel pipe is pushed to the welding track for welding, the flux automatically flows into the welding seam to be welded. At this time, the welding wire is in automatic welding, which is called submerged arc welding of straight seam pipe.

There are many differences between resistance welding and submerged arc welding. The only thing in common is that they are both straight joints. The submerged arc welding we have just discussed uses flux for welding, while resistance welding uses current to generate resistance heat at the weld contact of the steel pipe to heat the local heat source and apply joint pressure for welding in this way. In welding, there is no need to fill metal, the whole of the multi-steel pipe will not cause deformation, but also automatic welding, which is called high-frequency resistance welding.

Another kind of direct-seam welded pipe is manual welding of the material, which means that the press presses the sheet into a barrel shape for welding, which is also a straight seam. Manual welding is relatively slow in efficiency, but it can also meet the requirements of weld detection. Resistance welding and submerged arc welding both use welding wire, while the welding rod is used for manual welding. The welding rod is selected according to the material of the steel plate, and the steel plate of the material will use the welding rod, which is called the artificial straight seam welding pipe.

The main uses of these welding processes are piling, ships, oil pipelines, gas pipelines, drinking water transportation pipelines, sewage discharge pipelines, gas pumping, Bridges, steel structures, etc... .

Cangzhou Shenlong Pipe mainly produces seamless steel pipe, straight seam steel pipe, spiral steel pipe, but also can process galvanized, anti-corrosion coating, has more than 20 years of production history, reliable quality, is a qualified supplier of BP oil, Petro China.

Steel pipes have been a crucial component in various industries for decades, and the welding process plays a vital role in their production. Among the different types of steel pipes available, straight seam steel pipes are widely used due to their durability and versatility. The welding process involved in creating these pipes is not only fascinating but also essential to ensure that they meet industry standards. In this blog post, we'll take an in-depth look at the welding process of straight seam steel pipe, including its various types, advantages, and applications. So let's dive right into it!

Types of welding process

When it comes to welding straight seam steel pipe, there are several types of welding processes to choose from. Each process has its own advantages and applications.

One popular type of welding process is the Submerged Arc Welding (SAW) method, which involves feeding a continuous wire electrode into the seam while submerged in flux. This creates a protective layer over the weld and produces high-quality results with minimal distortion.

Another common method is Gas Tungsten Arc Welding (GTAW), also known as Tungsten Inert Gas (TIG) welding. It uses a tungsten electrode to create an arc that melts the metal together without adding any filler material. GTAW provides precise control over heat input and can be used in various positions due to its low spatter output.

Shielded Metal Arc Welding (SMAW), or stick welding, uses a consumable electrode covered in flux that melts and forms the weld pool when struck against the workpiece. It's often used for field repairs or maintenance due to its portability but requires more skill than other methods.

Other techniques include Gas Metal Arc Welding (GMAW/MIG), Flux-Cored Arc Welding (FCAW), Plasma Arc Welding (PAW), among others.

Choosing which type of welding process depends on various factors such as thickness, location, materials being welded, joint configuration, equipment availability, cost-effectiveness among many others.

The advantages of each welding process

There are several welding processes used in the production of straight seam steel pipes, each with its own set of advantages.

The first process is the Electric Resistance Welding (ERW) method which uses a high-frequency current to heat and melt the edges of two pieces of metal that are then fused together. This process is advantageous as it produces pipes with a smooth finish, high dimensional accuracy, and can be easily automated for mass production.

Another popular welding technique is the Submerged Arc Welding (SAW) method which involves melting the metal using an arc between a bare electrode and workpiece submerged under a layer of flux powder. The SAW technique has several advantages such as producing high-quality welds at fast speeds while maintaining low heat input and minimal distortion.

Gas Tungsten Arc Welding (GTAW), also known as Tungsten Inert Gas (TIG), utilizes a non-consumable tungsten electrode to produce welds on thin sheets or tubes without adding filler materials. GTAW offers many benefits like precise control over the welding parameters resulting in clean-looking welds with no spatter.

Flux Cored Arc Welding (FCAW) is similar to MIG welding but uses flux-cored wire instead of solid wire making it ideal for outdoor applications where wind can blow away shielding gas. FCAW provides better penetration than MIG welding and produces strong joints even on dirty or rusty surfaces.

Selecting the best suitable welding process depends on various factors including pipe size, material type, required properties, cost-effectiveness among others.

The application of each welding process

The choice of welding process used for straight seam steel pipe depends on the intended application. Each process has unique characteristics that make it suitable for certain applications.

For instance, the ERW welding process is ideal for pipes with smaller diameters and thinner walls. This method produces high-quality welds that are strong and visually appealing, making it perfect for decorative piping or structures where appearance matters.

On the other hand, the SAW welding process is most effective when dealing with thick-walled pipes or those that require deep penetration. It can handle larger diameter pipes than ERW and produce consistent weld quality over long distances.

For more demanding applications such as pipelines carrying flammable or corrosive materials, the submerged arc welding (SAW) method provides a highly reliable option due to its ability to create hermetic seals.

When working in areas where minimal distortion is critical, TIG welding offers a precise level of control while producing clean welds without spatter or smoke emission.

Selecting an appropriate welding method depends on several factors like material thicknesses & diameters among others - but all these methods offer unique advantages based on your project requirements.

Conclusion

To sum up, the welding process of straight seam steel pipe is crucial in various industries such as oil and gas transportation, construction, and automotive manufacturing. Welding ensures that the pipes are sturdy enough to withstand pressure and other environmental factors.

There are different types of welding processes available for a straight seam steel pipe. Each method has its advantages and suits specific applications. Therefore, it's essential to choose the right type of welding technique based on your project requirements.

Whether you opt for arc welding or resistance welding, ensure that you follow safety precautions during the process to avoid accidents and injuries.

Understanding each type of welding process can help you make informed decisions when selecting a suitable technique for your project needs. With proper research and training in place, your team can deliver high-quality welded steel pipes that meet industry standards while adhering to safety guidelines.

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Cangzhou Shenlong Pipe Manufacturing Co., Ltd. is a company& supplier& manufacturer& factory specialized in the production, processing and sales of various steel pipes, such as seamless pipe, welded pipe, straight seam steel pipe, spiral welded steel pipe, hot galvanized steel pipe, coating steel pipe, stainless steel pipe, and pipe fittings, the production base is located in Cangzhou.

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