The welded pipe is a steel pipe made of steel plate or strip steel after being crimped and welded, generally with a length of 6 meters. The production process of welded steel pipe is simple, the production efficiency is high, there are many varieties and specifications, and the investment in equipment is small, but the general strength is lower than that of seamless steel pipe. Welded pipe is a metal pipe widely used in construction, machinery, automobile and other industries. With the development of modern manufacturing technology, the production process and equipment of welded pipe are constantly updated and iterated.

1. Production process

The production process of welded pipe is mainly divided into four steps: steel strip flattening, cutting, forming and welding.

(1) Flattening of the steel strip The initial step in the production of welded pipes is to flatten the steel strip for subsequent processing operations. The flattening machine presses and pulls the steel strip through the rotation of the rollers to make it flat.

(2) After cutting through Kaiping, the steel strip enters the cutting machine. The cutting machine cuts the steel strip with a saw blade or a blade, and cuts the steel strip into small pieces of a certain length according to the required length.

(3) Forming After cutting, the steel strip enters the forming machine. The forming machine will shape the steel strip after being cut into small pieces through a specially designed roller set, and the formed pipe will appear square, rectangular or round, which is convenient for subsequent welding.

(4) The welded pipes are welded by high-frequency induction heating. When welding, it is necessary to ensure that the inside and outside of the pipe are fused, and the welding position must be completed under a small convexity. After the welding is completed, the pipe is cooled and sawed to the required length before proceeding to the next step.

2. Production equipment

In the production process of welded pipes, multiple equipments need to be used, including: flattening machine, cutting machine, forming machine, welding machine, flaw detection instrument, etc.

(1) Flattening machine The flattening machine is equipment used for flattening operation of steel strips, and can be flattened for imported steel strips.

(2) Cutting machine The cutting machine is a device for cutting the steel strip processed by Kaiping, and can cut the steel strip in batches according to the required length and quantity.

(3) Forming machine The forming machine is a device for forming the cut steel strip, which can produce pipes of different shapes and sizes.

(4) Welding machine The welding machine is the core equipment for producing welded pipes. It uses high-frequency induction heating for welding, and the welding position must be completed under a small convexity.

(5) Flaw detection equipment Flaw detection equipment is used for internal flaw detection of welded pipe materials, and can detect whether there are defects in pipes and other problems.

Summarize

Welded pipe is a metal pipe widely used in construction, machinery, automobile and other industries, and its production process and equipment are constantly updated and iterated. This article briefly introduces the production process and equipment of welded pipes, including the four steps of flattening, cutting, forming and welding of steel strips, as well as production equipment such as flattening machines, cutting machines, forming machines, welding machines, and flaw detection instruments.