Author: Stagiaire Communication

Whatever Super, Hyper or Lean Duplex: Polysoude excel in all Stainless Steel Grades Welding

Posted on by Stagiaire Communication

WHAT IS DUPLEX STAINLESS STEEL?

Nowadays duplex stainless steel has become popular and inescapable in the world. Reckoned to be stronger and more corrosion resistant as regular stainless steels, duplex stainless steel is a special Fe-Cr-Ni-N alloy system with 2 phases in its metallurgical structure where Ferrite and Austenite are concentrated in roughly equal proportions.

Both lean or standard duplex stainless steel are offering great opportunities in many industries because of their improved corrosion resistance properties and higher mechanical strength. Even more Super duplex is offering a greater corrosion endurance and strength but is more difficult to process. Hyper duplex has been developed where higher mechanical and corrosion performances are expected or necessary such as oil and gas and offshore applications. It is consequently even more complex to prepare and weld.

Thanks to their resistance characteristics, duplex stainless steels with their several grades as Super, Hyper, Lean or Standard are covering applications in many industries such as:

  • Water desalination equipment
  • Petrochemical piping, Tubbing, Heat Exchangers for the handling of Oil and Gas (mostly Hyper and Super Duplex)
  • Pumps, Pressure vessels, Tanks, Piping and Heat exchangers in the chemical processing industry (all grades)
  • Food processing equipment (mostly standard and Lean Duplex)
  • Pharmaceutical manufacturing equipment
  • Geothermal energy & Solar Power facilities
  • Mining processing & LNG (Liquefied Natural Gas)
  • Nuclear Power plants equipment

But with duplex stainless Steel excellent strength and heat insulation capacity to cover extremes of temperature and pressure, this material is very difficult to weld if not processed expertly.

Duplex and Super-duplex steels can lose their mechanical and physical properties as the ferrite content increases. Therefore, welding of Duplex steel is generally possible, but the extraordinary properties of this material can be easily deteriorated by inexpert processing.

Polysoude's orbital welding technique offers a reliable process that guarantees the efficiency of assembly techniques to meet specific requirements. The energy used to weld must, therefore, be kept as low as possible to ensure the lowest ferrite level.

Depending on the workpieces to be assembled, our complete range of automated TIG welding heads and advanced power sources can come into operation: for example, MU open weldhead holds no secret for umbilical production used in Oil & Gas. MW closed welding heads would outshine any challenge in High Purity for all tube to tube welding for tubes O.D. 6 to 170mm (up to 6”). Perfect for reduced radial clearance, compact carriage-type Polycar welding heads ‘30’ model (from 32 to 168mm – from 1” to 6”), ‘60’ model (>170mm – from 6”) featured cold or hot wire (CW/HW) up to the heavy duty – narrow groove ‘MP’ model (>170mm – > 6”).

This welding video of one umbilical commonly used for offshore applications will speak more than a thousand words.

WHAT ARE DUPLEX STAINLESS STEEL MAIN ADVANTAGES?

  • Lightweight compared to its resistance and other types of stainless steel
  • It can provide a high strength resistance: about twice as strong as regular austenitic or ferritic properties
  • Its toughness and ductility are higher than regular steels: duplex stainless steel has better toughness and ductility than ferritic
  • It holds a high general corrosion resistance: duplex stainless steel grades have a range of corrosion resistance similar to the range of austenitic stainless steels
  • Affordable costs: the low nickel content of duplex stainless steel makes them a more cost-effective option compared to its durability abilities.

Product release: Discover our new power sources P4-3 and P6-3

Posted on by Stagiaire Communication

Polysoude presents the latest developments in its orbital TIG welding power source. Including industry 4.0 protocols, these power sources support you in your processes to ensure flawless welds and unparalleled productivity.

What are the P4-3 & P6-3 modifications?

The power sources have been modernised to integrate even more easily into companies wishing to engage in the industrial evolution towards digitalisation: industry 4.0.

As a result, the power sources of the P4-P6 range can now be integrated into a global system for exchanging information via a local network (Ethernet) or via the Internet (WIFI) and communicate with their environment and with the company (its information system, its organisation).

The recording, visualisation and analysis of welding data can be centralised, and the supervision of welding parameters of several online generators is now possible.

Remote access for support, loading welding programs and data recovery results in increased productivity, quality and consumption for your applications.

The high-resolution touch panel, now independent, allows you to control, load, modify, save welding programs and connect to any power source of the same model via a quick and "hot" connection.

The new simple and intuitive user interface (IHM) includes more search criteria to suggest the welding program best suited to your application. A more visual identification then exists to distinguish the calculated programs, those of the library and yours. New fields are available to help you organize your data.

These power sources are production tools particularly suitable for all types of workshops or construction sites, even under difficult environmental conditions.

Read the P4-3 Brochure
Read the P6-3 Brochure

The new P4-3 and P6-3 are the result of 50 years of experience in orbital and automated welding that Polysoude puts at your disposal to enable you to meet your challenges by offering even more innovative products.

YOU WANT TO KNOW MORE ABOUT IT?

See our latest video presentation

Contact us

Producing pipework complying with improved safety requirements for the conveyance of dangerous materials

Posted on by Stagiaire Communication

ARTIS, a company based in western France, is a manufacturer of industrial pipework, specialising particularly in producing pipe networks for the conveyance of fluids such as gases, oil and water.  The company supports its customers with its vast experience and wide-ranging technology, furthermore, at the heart of its philosophy is an emphasis on both quality and safety.

These two overriding objectives were evident in a project which ARTIS undertook, to produce pipework for conveying dangerous substances, for a major supplier of fluid transportation, with extremely high safety standards. ARTIS met the exacting specifications of this customer in two ways: by purchasing the most appropriate machinery to manufacture the pipe network and by increasing its own levels of expertise and safety qualification.

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TIG GTAW orbital welding equipment with filler wire was purchased from Polysoude, France.  The equipment provided by Polysoude comprised of two orbital welding heads of the MU series, a wire feeding device and a power source of the type P6.  Purchasing this equipment guaranteed repeatability of production, eliminated imperfections, ensured sustained quality and safety and reduced the need for manual work.  Furthermore, the knowledge of Polysoude’s welding specialists proved invaluable.  Since, before welding could proceed, Polysoude’s experts formulated a proposal to adapt the pipe ends, which had previously been prepared for manual welding.  The successful solution meant that pipes of different end geometries could be welded using the orbital welding process.

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Also besides, ARTIS was determined to ensure the safety of the pipework throughout its life span with first-class welds, without imperfections.  With regards to pipe networks for the conveyance of dangerous substances, the approval of a certification body must be obtained before production can be started. Aware of the criteria, ARTIS also established Welding Procedure Specifications to complete the qualification.

ARTIS invested time and money to achieve the high standards of quality and reliability of the results of the applied WPS. Via a training program for the new equipment conducted at Polysoude’s application laboratory, the ARTIS technician was fully familiarised with the orbital technology.

Overall, this project has been a success for all parties involved. Polysoude equipment has proved its quality and sustainability, ARTIS has developed its knowledge and use of orbital welding equipment, boosting its production and its report will benefit the customer’s management in terms of the experience gained.

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