Spiral welded steel pipe connection methods and applicable welding rods

Spiral welded steel pipe (SSAW) connection methods and applicable welding rods

Common connection methods:

Spiral welded steel pipe is a long strip of steel commonly used in oil and gas transportation, building structures, bridges and other fields. Its connection methods can be divided into three types: butt connection, clamp plate connection and plug-in connection.

1. Butt connection

Bevel processing is performed on both ends of the spiral steel pipe and the butt connection is used. This connection method is usually suitable for transporting medium with high pressure, such as natural gas, oil, etc. Its advantages are firm connection and good sealing, but its disadvantage is that the processing technology is relatively cumbersome and requires precise bevel processing and alignment.

2. Clamp plate connection
The two ends of the spiral steel pipe are connected by gusset plates. The advantages of this connection method are simple processing technology and convenient connection, but it is not suitable for occasions with high sealing requirements.

3. Plug-in connection
This connection method is suitable for spiral steel pipes with larger diameters. It mainly inserts the front and rear ends and then assembles them into a complete pipe. Its advantage is that the connection is simple and convenient, and it is suitable for remote or inaccessible areas. Its disadvantage is that the stiffness of the connection part is poor.

Choose the appropriate welding rod:

The connection of spiral welded steel pipes requires the use of welding technology, and correct welding technology requires the selection of appropriate welding rods. When selecting welding rods, you need to consider the type of pipe and the use environment, and try to choose high-efficiency welding rods suitable for spiral welding, which can improve production efficiency and welding quality.

Commonly used welding methods include manual arc welding, submerged arc welding, argon arc welding, etc. In the welding of spiral steel pipes, commonly used welding rods include low hydrogen potassium calcium welding rods, low alloy high strength steel welding rods and stainless steel welding rods. Among them, low hydrogen potassium calcium type electrodes are suitable for welding high-strength low alloy and carbon steel pipes, low-alloy high-strength steel electrodes are suitable for welding high-strength low-alloy steel pipes, and stainless steel electrodes are suitable for welding stainless steel and acid-resistant steel pipes.

Applications of spiral welded steel pipes:

Spiral steel pipes are mainly used in water supply projects, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction. The specific uses are as follows:
1. As piling steel pipes, spiral steel pipes do not require any anti-corrosion processing and can be used directly. Generally used for bridge piling, highway support, turret billboard columns, etc.;
2. As a pipeline for fluid transportation, spiral steel pipes need anti-corrosion processing, such as: outer epoxy coal pitch paint, epoxy resin powder, 3PE anti-corrosion, etc. Generally used for transportation steel pipes in municipal water supply, drainage, sewage treatment projects, ocean water crossings, etc.;
3. Spiral steel pipe is used for gas transportation. Generally used in gas, steam, liquefied petroleum gas and other transmission pipelines.

In general, the connection method and applicable welding rods of spiral welded steel pipes should be selected according to the requirements of the specific pipeline during the production process to ensure the final pipeline quality and use effect.

Go here to learn more: Welded steel pipe production process