Welding service

Welding has been an important part of PSW Technology`s business for many years. PSW Technology has acquired a high level of competence and experience to comply with standards and regulations in the demanding offshore/subsea marked. Our welding shop is capable for assembly and welding of a variety of steel structures, pipe systems and special welding processes. 

Our IWE is responsible for the quality and development of the welding processes and procedures. We are continuously developing new welding procedures to meet any requirements from our customers. All our welders are approved according to NS-EN ISO9606.

We also execute NDT, sandblasting and painting.

Typical welding projects

  • Welding of riser main pipes
  • Welding of Flex joint
  • Welding of Slip joint
  • Welding of Riser auxiliary lines
  • Inconel ring groove
  • Stellite cladding
  • Lifting equipment
  • Rack, foundations, structures etc
  • Piping for Mongstad refinery
  • Chemical tanks

SubArc Welding (PulverBue)

Submerged arc is a mechanized process, where one wire is fed through a conduit and a contact nozzle up to the welding arc. The arc and the molten pool are protected by a mineral flux supplied in front of the wire, this melts and creates a slag which also contributes to a particularly smooth and even weld surface. Submerged arc welding is suitable for most unalloyed and alloyed types of steel. The process stands out by its good welding economy, which is caused by a high deposition rate, and in general few welding defects. Submerged arc is also extensively used for cladding, where wear resistant or corrosion resistant metals are deposited onto ordinary steel.

Post Weld Heat Treatment

PSW Technology performs PWHT with inhouse calibrated equipment.


PSW Solutions performes complete NDT service as part of all welding projects:

  • MT - Magnetic particle testing
  • PT - Penetrant Testing
  • VT - Visual inspection
  • HT - Hardness Measurement
  • ET - Eddy Current Testing
  • ECA - Eddy Current Array
  • RT - Radiographic Testing
  • UT - Ultrasonic Testing
  • PA - Phased Array
  • IWI/NS477 - Weld Inspection
  • Level 3 services, external

Surface treatment

With extensive experience from on/offshore installations, PSW Group provide a unique expertise in the execution of a complete surface treatment. We provide surface treatment of all steel qualities, industrial surface treatments according to NORSOK M-501 and other OEM procedures in our state-of-the-art facilities, with specialized painting systems including metallization.

Facilities - Equipment

  • Welding shop 54m x 30m x 10.5m height to 20t crane hook
  • Welding shop 30m x 20m x 7,5 m height to 25t crane hook
  • Submerged Arc welding machine
  • MAG welding machines
  • TIG welding machines
  • Welding manipulator, 8-ton capacity, 1m dia.
  • Cold cut machine (saw) max Ø600mm

Welding process types


111 Manual metal arc/stick welding
AISI 4130 - PT 5L X52
121 Submerged arc - solid wire
AISI 4130/X80
136 MAG Flux cored
S420 G2+M, AISI 4130, NVE36, S355J2, API 2W Gr. 70, Hardox 450, API 5LX65, AISI316L, S420ML
138 MAG Metal cored
S420 G2+M, API 5LX65
141 TIG Solid wire
AISI 4130, API 5LX52, X80, 22 Cr, NVE36, F22, 316L
Inconel 625 cladding
Stellite No.6 cladding
HVOF cladding
Repair procedure for Inconel cladding
Contact us
For any questions, please ask for
Håvard Kallestad
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PSW Power & Automation has installed the solar power plant on the roof of parent company PSW Group's new facilities in Mongstad. With its 1200 solar panels over 2500 square meters, the plant is the tenth largest in Norway, and the building's own power generation is approximately 350,000 kWh per year.

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