Table of content
Introduction
Welded steel pipe is one of the most commonly utilized steel channels in plumbing frameworks, discuss conditioning frameworks, or mechanical channels. Choosing the right pipe is significant to the by and large viability of the framework. So, what is welded steel pipe? How is it distinctive from other sorts of channels such as consistent pipes?
This article will give vital information approximately welded steel channels, counting its generation handle, sorts, preferences, and common employments. Ideally, this direct will offer assistance you get it the part of welded steel channels in present day infrastructure.
What is welded steel pipe?
Welded steel pipe is a persistent pipe made by rolling steel plates or strips into a round and hollow shape and welding the edges together. Not at all like consistent channels made from strong steel billets, welded steel channels are made by welding steel sheets beneath tall temperature and pressure.
Key highlights of welded steel pipes
Generation prepare: Made by welding rolled steel plates or strips.
Creases: Welded steel channels have a discernible weld along the length of the associated edges.
Quality: By and large talking, welded steel channels have solid pliable quality and can withstand direct pressure.
Significance: The welding handle makes the joint more grounded, but it too implies that the welded steel pipe has a crease, which may gotten to be a frail point compared to consistent pipe in high-pressure applications.
Types of Welded Steel Pipes
Welded pipes have different names depending on the production process. The following are several common welded steel pipes:
1.ERW (Electric Resistance Welded) Pipe
The production process of ERW pipes is to roll steel strips and then weld the joints.
There are two welding methods for ERW pipes, one is straight seam welding and the other is spiral welding.
ERW pipes are mostly used in water transportation and natural gas pipelines.
2.LSAW (Longitudinal Submerged Arc Welded) Pipe
LSAW pipes are made of steel plates and use submerged arc welding technology.
LSAW pipes are mostly used in high-pressure pipelines and produce large-diameter steel pipes.
LSAW pipes are mostly used in the chemical industry and the oil and gas industry.
3.SSAW (Spiral Submerged Arc Welded) Pipe
SSAW pipes are made of spirally wound steel strips, which are first heated into a cylindrical shape and then welded.
SSAW pipes are mostly used to produce large-diameter steel pipes and are also one of the preferred choices for high-pressure pipes.
SSAW pipes are mostly used for water supply pipes, natural gas pipes, etc.
Among them, ERW is mostly used for medium and low pressure pipes, while LSAW and SSAW are mostly used for high-pressure pipes.
Manufacturing Process of Welded Steel Pipe
The production process of welded steel pipes generally has the following steps:
- Material selection: Select the appropriate steel plate or steel strip according to the needs.
- Pipe forming: The steel plate or steel strip is made into a cylindrical shape through heating and other manufacturing processes.
- Welding: Select the appropriate welding method for welding according to different production processes.
- Sizing and cooling: The welded steel pipe is sized and cooled according to the production standards.
- Finishing: The surface is burred and anti-corrosion treatment is required.
Advantages of Welded Steel Pipes
1. Economic and efficient
Welded steel pipes are more economical than seamless pipes, mainly because the raw materials are steel plates or steel strips, and the production process is relatively simple compared to seamless pipes.
2. Customizable size
According to production standards and customer requirements, welded pipes can produce steel pipes of various sizes. Especially some large-diameter steel pipes.
3. High strength
Welded steel pipes also have good tensile strength and corrosion resistance (after coating with anti-corrosion layer).
4. Wide application
Welded pipes have high strength and pressure resistance, and are relatively cheap. Therefore, they are widely used and can be used for both low and high pressure.
Disadvantages of Welded Steel Pipes
1. Weld defects
Since welded pipes are rolled into a cylindrical shape by steel plates and then welded, some steel pipes have welds.
2. Poor corrosion resistance
Corrosion resistance cannot be generalized. Corrosion resistance varies according to different materials. But if you want to improve corrosion resistance, you need to add a layer of coating.
Applications of Welded Steel Pipe
Welded steel pipes are widely used, mainly in the following applications:
Oil and gas pipelines: Because they can withstand high pressure and have certain corrosion resistance, they can be used in this industry.
Sewage treatment system: Because it is low-priced and does not require high pressure. So it is a good choice.
Chemical and petrochemical industries: When transporting chemicals and some corrosive items, adding a layer of anti-corrosion coating can effectively increase the service life.
Construction industry: Used in some scaffolding and frame supports. Because it does not need to withstand too high pressure.
HVAC system: In the HVAC system of cooling and heating, its safety can also be well guaranteed.
Welded Steel Pipe vs. Seamless Steel Pipe
The specific differences between the two are as follows:
| Feature | Welded Steel Pipe | Seamless Steel Pipe |
|---|---|---|
| Manufacturing | Made by welding steel plates or strips | Made from a solid billet without seams |
| Strength | Strong, but weaker at the weld seam | Uniform strength throughout the pipe |
| Applications | Ideal for medium pressure applications | Best for high-pressure or critical systems |
| Cost | More affordable | More expensive due to manufacturing process |
Welded pipes are more economical and suitable for some medium and low pressure systems. Seamless steel pipes are more expensive and withstand higher pressure.
How to Choose the Right Welded Steel Pipe
When choosing steel pipes, you can refer to the following aspects for selection:
1. Material: Consider whether to use carbon steel, stainless steel or alloy steel according to the use pressure and environment.
2. Pipe specifications:Choose the appropriate size and wall thickness according to the pressure level it withstands.
3. Application requirements:Whether it needs to withstand high temperature, high pressure, corrosion and other conditions.
Conclusion
Welded steel pipe is one of the most commonly used steel pipes. It can be used in various industrial pipelines. Which type of welded steel pipe should be selected? LASW, SSAW, ERW can be selected based on their performance mentioned above.
