Longitudinal Submerged Arc Welding (LSAW) Processes

Extracto:

Longitudinal Submerged Arc Welding is a specific welding technique used in pipe production where the finished product requires a particularly high wall thickness due to high internal or external pressures.
With this in mind the main applications of LSAW pipes include oil, natural gas, gas, central heating, water supply, sewage treatment and other similar uses.

Steel pipes are long, hollow tubes that are used mainly to convey products from one location to another. They are produced mainly by two distinct manufacturing methods which result in either a welded pipe or seamless pipe. In both the manufacturing methods, raw steel is first cast into a more workable starting form (slabs, hot billet or flat strip). It is then made into a pipe by stretching the hot steel slab/billet out into a seamless pipe or forcing the edges of flat steel strip together and sealing them with a weld.

When operational conditions require high wall thickness due to high internal or external pressures, LSAW (Longitudinal Submerged Arc Welding) pipes are commonly the most economical solution.

The LSAW pipe diameter range is larger than ERW (Electric resistance welding), normally from 16 inch (406 mm) to 60 inch (1500 mm). Good performances on high pressure resistance, and low-temperature corrosion resistance.

In LSAW pipe mills, processing is carried out by cold forming heavy carbon steel plates, the pipe pre‐material on which many of the pipe properties depend.

The material of LSAW steel pipe is unit middle or heavy thickness sheet, coiled in the molding or forming machine, welded by double submerged arc welding and expand the diameter. The specification scope is wide, and have good toughness, ductility, uniformity, compactness, etc.

Longitudinal submerged arc welded (LSAW) pipes manufacture process is bending and welding wide steel plates to pipes from leveled hot rolled coils by both the JCOE and UOE (the forming process in which the plate like the letter "J", "C", "O" or "U" shape, then expansion) forming processes.

In Figure 1 is shown a UOE method for production of longitudinally welded large diameter pipes. Longitudinally edges of steel plates are first beveled using carbide milling equipment. Beveled plates are then formed into a U shape using a U-press subsequently into an O shape using an O-press.



Figure 1: Longitudinal seam Submerged Welded (LSAW) pipes with UOE process

Inspection: Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test. Application of LSAW Steel Pipe: The tubes are mainly used for oil, natural gas, gas, central heating, water supply, sewage treatment, low-pressure fluid delivery and so on.



Figure 2: Longitudinal seam Submerged Arc Welded LSAW pipes


References

1. Introduction to welded Pipe Manufacturing, July 2018, Accessed APRIL 2019;

2. Pipe Manufacture—Longitudinal Submerged ARC Welded Large Diameter Pipe, Accessed APRIL 2019;

3. Longitudinal seam Submerged Arc Welded (LSAW) pipes, Accessed APRIL 2019;

4. Longitudinally Welded SAW pipe, Piyush Steel, Pipe and Tubes, Accessed APRIL 2019.

Buscar en la base del conocimiento

Introduzca una frase para buscar:

Buscar por

Texto completo
Palabras clave

Títulos
Extractos

The Total Materia database contains many thousands of materials suitable for welding applications across a large range of countries and standards.

Where available, full property information can be viewed for materials including chemical composition, mechanical properties, physical properties and carbon equivalent data as well as advice on welding application.

Using the Advanced Search page, define the search criteria by selecting ‘Welding filler materials’ in the Group of Materials pop-up list. It maybe that you need to further narrow the search criteria by using the other fields in the Advanced Search page e.g. Country/Standard.

Then click Submit.

solution img

A list of materials will then be generated for you to choose from.

solution img

After clicking a material from the resulting list, a list of subgroups derived from standard specifications appears.

From here it is possible to view specific property data for the selected material and also to view similar and equivalent materials in our powerful cross reference tables.

solution img

Click on the property data link of interest to you to view specific property data.

solution img

For you’re a chance to take a test drive of the Total Materia database, we invite you to join a community of over 150,000 registered users through the Total Materia Free Demo.