Pipelines

Welding of pipelines – the process of obtaining permanent pipe connections and pipeline components by heating and (or) plastic deformation. Pipe welding methods are classified into thermal, mechanical and thermomechanical.

The most common method of pipeline welding is thermal method - arc welding, where the heat source of connected pipe edges (details) is an electric arc between the consumable electrode and the edges of pipes.

During arc welding in shielding gases the heat source of the pipe edges is an arc, protected by gas stream that are fed into the arc zone through the nozzle. Welding in shielding gas has the following varieties: type of shielding gas - welding in inert gas (argon, helium, thereof mixture), in active gases (CO2, nitrogen, hydrogen), welding a mixture of inert and active gases (Ar + CO2; Ar + CO2 + O2); type of electrode - consumable and non-consumable (tungsten) electrode; degree of mechanization - manual, semi-manual, mechanized and automated welding. Arc welding in shielding gases is using for welding pipes of any diameter piping in different spatial positions.

Method of mechanized welding by flux cored wire with forced weld formation are using for pipe welding where security functions are operated by powder components inside of metal wire. During crystallization of the weld pool the outside forming device and the welding head move along the perimeter of the joint from the bottom to top. Arc welding of pipelines under a flux layer is used only if the possibility of joint rotation exists.

Feedback

Fill in the correct

Fill in the correct

* - Required fields

Your request is sent successfully!

Subscribe to news

Fill in the correct

* - Required fields

You have successfully signed up for newsletter