Fabrication

We are not limited to just direct services. Lets us hand all your needs in the following areas:

• • Pipe Racks
  • Tables
  • Inspection Racks
  • Work Benches
  • Work Tables
  • Baskets
  • Skids (On and Offshore)

PTA (Plasma Transfer ARC)

PTA process, Plasma Transferred Arc, is a melting welding process suitable for hardfacing on mechanical workpieces subject to wear and/or corrosion with superalloy metal powders.

PTA process is characterized by an high density plasma arc, obtained by ionization of Argon gas passing through the electric arc formed between a non-consumable tungsten electrode (-) and the copper plasma nozzle (+) into the welding torch (pilot arc).
A second electric arc, called Transferred Arc, produces the energy needed to melt both the base metal and the filler metal.
The transferred arc is “throttled” to obtain a further increase of the temperature, obtaining a plasma column with temp between 8.000° C and 18.000°C.

The powder filler metal is continuously projected on the piece through the plasma arc. The driven output of Commersald torch allows to keep the dispersion in flat below 5% and to deposit, in max efficiency conditions, beads from 1 to 4 mm and width from 3 to 30 mm. The shape and the size of the coated layer change according to the welding parameters.

The penetration control in Commersald machines is obtained by varying the quantity of ionized gas and it is not conditioned by the process, unlike other arc welding systems.

The quantity of plasma gas is continuously adjustable by the operator and it is monitored by a sophisticated feedback control. This is one of main features of Commersald PTA process in welding coatings, so that, in most cases, you can work with one layer only, obtaining an hardness closed to the nominal value of the alloy employed. On the contrary, the extreme and uncontrolled dilation of other processes makes it almost impossible to obtain the required analysis at first pass.

NIFD Wire

NIFD is a flux core wire filled with fused tungsten carbide and NiCrBSi- matrix for semi-automatic welding application. It was developed to protect surfaces against extreme abrasive wear in combination with corrosion attacks. The deposit alloy consists of approximately 60% FTC and 35-40% Ni-Cr-B-Si-matrix. The alloy has a low melting range of between 900-1050°C (1652-1922°F) and feature a self fluxing characteristics producing a smooth and clean surface. The matrix is highly resistant to acids, bases, lye and other corrosive media.

Application:
Repairing and hard facing ferritic and austenitic steel tools and machine parts (steel casting). Specially developed for semi and fully automatic welding on tool joints and stabilizers in the petroleum industry.

At Diamond Oilfield Services we also specialize in the following services: 

• Premium Carbide Rods
• Spray Fusion 
• Down Hole Stabliezers and Kick Pads
• Rotor Restubs
• Rotor Catch Repair