Pipe Welding Process and Benefits

Trimay Pipe Products represents the pipe products division of Trimay, and was established in 2005 with the aim of conducting research and development of an optimal welding process for applying inershield flux wires on the inner surfaces of industrial pipes used in high-wear environments. The research efforts were bore fruit in 2008 and Trimay Pipe Products offered its first test pipes to a select group of customers in 2009. Trimay pipes serve to minimize pipe distortion, which leads to shrinkage and pipe elongation. They possess the quality to maintain a strong bond between the base pipe and the flux wires laid on it.

Welding Process Adopted by Trimay Pipe Products

The pipes, bends and elbows of Trimay Pipe Products are produced one by one using an automatic welding system. The process involves the use of welding machines and inershield flux wires. Each machine is overseen by a welder who ensures that the welding surface is clean and a steady spool rate is maintained. The operator is also responsible for maintaining a consistent overlay thickness and adjusting the welding parameters such as voltage and amperage and voltage in order to keep the dilution rate at 15% consistently so that the pipes produced are of high quality.

Key Features of Pipes by Trimay Pipe Products

  • Minimal pipe elongation and shrinkage (less than 2.5% in length, and under 3% on inside diameter shrinkage)
  • Even weld bead across the entire pipe length due to the maintenance of a steady dilution rate
  • Strong cohesion between the substrate and overlay

Key Benefits of Pipes by Trimay Pipe Products

  • Pipes can be easily installed and aligned on-site because of minimal pipe shrinkage
  • Welds are long-lasting welds at installation seams because the pipes accommodate more flush (the flow of materials such as slurry and tailings is less disturbed, ensuring less wear
  • Clean welding surfaces, even thickness, consistent dilution rate and steady wire speeds ensure strong cohesion
  • Consistent manufacturing process and welding parameters ensure even wear potential at all locations on the pipe

Size and Overlay Thickness of Trimay Pipe Products

Trimay Pipe Products offers pipe in five different overlays with similar thickness options, with the exception of the high-percentage Tungsten flux wire type. The size specifications vary based on the pipe section used. Pipes are offered with five different types of flux wire overlays, namely, Chrome, Complex, Tungsten <50%, Tungsten >50%, and Boro, whereas the base pipe is made of carbon steel.

Table 1. Overlay Type and Thickness

Flux Wire Type Used Overlay Thickness Range
Chrome 1/16” - 3/8” (1.5mm - 9mm)
Complex 1/16” - 3/8” (1.5mm - 9mm)
Tungsten < 50% 1/16” - 3/8” (1.5mm - 9mm)
Tungsten >50% 1/16” - 3/16” (1.5mm - 4.5mm)
Boro (T171*) 1/16” - 3/8” (1.5mm - 9mm)

Overlays made with Tungsten >50% flux wire can only go as thick as one weld pass will allow. This is due to Tungsten’s high melting point (3422°C, 6192°F) which prevents a second weld pass from properly diluting into the first. Second passes of Tungsten >50% is not recommended.

Table 2. Pipe Size

Pipe Section Inside Diameter (I. D.) Range Length Range
Straight Pipe 6” - 36” (.15m - .91m) Up to 20’ (6.1m)
Elbows 12” - 24” (.31m - .61m) 18” - 36” (.46m - .914m)
Transitions 12” - 28” (.31m - .71m) Up to 40” (1.02m)

Transition I. D. capability range is based on the mounting end of the transition/reducer. The smallest end of the transition is always the mounting end.

Fabrication of Trimay Pipe Products

The products offered by Trimay Pipe Products are capable of being threaded or flanged similar in fashion to any regular steel pipe, irrespective of the type of overlay use. Where applicable, all fabrication methods are compliant with API, ASME and ABSA standards.

About Trimay

Trimay develops and manufactures the highest quality wear overlays for customers seeking to maximize efficiency by extending the life of equipment, parts and pipelines exposed to severe wear conditions. Trimay achieves its high-quality standard through research and development, partner companies and exclusive suppliers, as well as through in- house experimentation and process optimization.

* Developed by Trimay Wearplate Ltd. using NanoSteel® Technology under license from The NanoSteel® Company, Inc.

Primary information source:Trimay Wear Plate Ltd

For more information on this source please visit Trimay Wear Plate.


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