Production of welded pipes (1973)

The production line at the factory.

In the technological process of obtaining a welded pipe, the main operations are forming a rolled strip or sheet into a cylindrical billet and welding it into a pipe.

These operations can be carried out by various methods, the use of which depends on the initial billet, the size of the material and the purpose of the finished pipes.

Large diameter pipes.

Welded pipes are made of carbon, alloy and stainless steel grades.

Hot pipe forming line.

Pipe cold forming line.

This molding is more technologically advanced, provides high accuracy of geometric dimensions and is widely used in the production of electric welded pipes.

Roll mill for cold forming of pipes.

On such a mill, straight-seam pipes with a diameter from 5 to 530mm are produced.

Forming of pipe blanks on powerful hydraulic presses.

Forming consists of three operations.

1. Edge bending.

2.Preforming.

Hydraulic press.

3.Final molding.

In one stroke of the press, the workpiece takes a cylindrical shape.

According to the same technological scheme, the sheet is formed into a half-cylinder in the production of double-seam pipes.

Cold forming of a cylindrical billet with a spiral seam is used for the production of pipes up to 2500mm in diameter.

A sample of such a pipe.

Scheme of cold forming of a cylindrical billet with a spiral seam.

A scheme for obtaining different pipe diameters from the same billet.

A cartoon explaining the hot forming process.

Collage of drawings telling about different welding methods.

Fusion welding.

Pressure welding.

Cartoon explaining the pressure welding process.

A cartoon explaining the melting welding process.

The structure of the welding seam.

Fusion welding using an electric welding arc.

Cartoon explaining the process of electric arc welding.

A cartoon explaining the process of welding with a melting electrode.

This method is used for welding gas and oil pipes of large diameter.

A new method of fusion welding is electron beam.

Cartoon explaining the process of fusion welding by electron beam method.

Cartoon explaining the process of pressure welding using high-frequency welding with induction current supply.

Pressure pipe welding line using high-frequency welding with induction current supply.

Cartoon explaining the process of pressure welding by radiofrequency welding.

Pressure welding furnace.

Production line for pipe welding by furnace method.

Installation of continuous furnace welding.

On such a line, water and gas pipes with a diameter of 6-114mm are manufactured.

Blank for such pipes, hot-rolled rolled strip.

The line for forming and welding of water and gas pipes.

Cartoon explaining the method of production of water and gas pipes.

A reduction mill in which pipes of a wide range of the same strip are produced by the method of reduction with tension.

Calibration mill, then the pipe is cut into measured lengths.

The cut pipes are delivered to the refrigerator.

Production line for straightening pipes, miter, hydraulic testing, cutting ends, screwing couplings and random inspection.

Shipment to the warehouse.

Pipe-electric welding mill.

The technological process of manufacturing pipes on the production line of such a mill.

The welding quality is controlled by a flaw detector.

Production technology of straight-seam gas and oil pipeline pipes of large diameter.

The billet for such pipes is sheet metal.

The line of preparation of blanks.

Forming on a hydraulic press.

Two-seam pipes made of two half-cylinders.

The formed blanks are delivered to the welding mill.

First, the outer seam is welded.

Welding of the inner seam is carried out with a two-arc welding head on special stands.

Pipe finishing.

Suitable pipes are supplied for trimming the ends.

Preparation for calibration.

Straightening and calibration of the pipe is carried out by exposure on expander presses.

The pipe is covered with detachable stamps.

There is a distribution of the pipe in diameter until its walls are adjacent to the stamp.

Hydraulic testing of the pipe.

Pipe miter operation.

Finished pipes.

Spiral seam pipe of large diameter.

Advantages of this type of pipes over straight-seam pipes.

Pipe-electric welding mill for the production of spiral-welded pipes with a diameter of 530-1420mm.

Pipe preparation line.

When the edges converge, an internal technological seam is applied.

The outer working seam is welded with a single-arc device.

The second internal double-arc welding machine completely digests the internal process seam.

The ultrasonic flaw detector continuously monitors the quality of the weld.

Cutting into measured lengths by gas-electric plasma cutting.

Cleaned of flux, the pipe enters for finishing.

A worker in the pipe visually checks the quality of the seam.

An effective way to check spiral-seam pipes and straight-seam pipes is the method of X-ray inspection.

Argon-arc welding machine.

A cartoon explaining the forming of spiral-seam pipes.

Soldering of spiral-seam pipes in a muffle furnace.

Welding of pipes on modern pipe welding units.