• Additive Manufacturing with Superduplex Stainless Steel Wire by CMT Process 

      Lervåg, Malin; Sørensen, Camilla; Robertstad, Andreas; Brønstad, Bård M.; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Aune, Ragnhild; Ren, Xiaobo; Akselsen, Odd Magne; Bunaziv, Ivan (Peer reviewed; Journal article, 2020)
      For many years, the oil and gas industry has utilized superduplex stainless steels due to their high strength and excellent corrosion resistance. Wire arc additive manufacturing (WAAM) was used with superduplex filler wire ...
    • Application of laser-arc hybrid welding of steel for low-temperature service 

      Bunaziv, Ivan; Akselsen, Odd Magne; Frostevarg, Jan; Kaplan, Alexander F.H. (Journal article; Peer reviewed, 2019)
      Laser-arc hybrid welding (LAHW) is more often used in shipbuilding and oil and gas industries in recent years. Its popularity arises due to many advantages compared to conventional arc welding processes. The laser beam ...
    • Dry hyperbaric welding of HSLA steel up to 35 bar ambient pressure with CMT arc mode 

      Bunaziv, Ivan; Aune, Ragnhild; Olden, Vigdis; Akselsen, Odd Magne (Peer reviewed; Journal article, 2019)
      Hyperbaric welding plays a significant role in subsea pipeline installations and repairs for transport of oil and gas from the offshore field to the market. The effect of ambient pressure, from 1 to 35 bar, on penetration ...
    • Filler metal distribution and processing stability in laser-arc hybrid welding of thick HSLA steel 

      Bunaziv, Ivan; Wenner, Sigurd; Ren, Xiaobo; Frostevarg, Jan; Kaplan, Alexander F.H.; Akselsen, Odd Magne (Peer reviewed; Journal article, 2020)
      Welds made by high power laser beam have deep and narrow geometry. Addition offiller wire by the arc source,forming the laser-arc hybrid welding (LAHW) process, is very important to obtain required mechanical prop-erties. ...
    • Hybrid Welding of 45 mm High Strength Steel Sections 

      Bunaziv, Ivan; Frostevarg, Jan; Akselsen, Odd Magne; Kaplan, Alexander F.H. (Peer reviewed; Journal article, 2017)
      Thick section welding has significant importance for oil and gas industry in low temperature regions. Arc welding is usually employed providing suitable quality joints with acceptable toughness at low temperatures with ...
    • Laser Beam and Laser-Arc Hybrid Welding of Aluminium Alloys 

      Bunaziv, Ivan; Akselsen, Odd Magne; Ren, Xiaobo; Nyhus, Bård; Eriksson, Magnus Carl Fredrik (Peer reviewed; Journal article, 2021)
      Aluminium alloys are widely used in many industries due to their high strength-to-weight ratios and resistance to corrosion. Due to their specific thermophysical properties and intricate physical metallurgy, these alloys ...
    • Laser-arc hybrid welding of 12- and 15-mm thick structural steel 

      Bunaziv, Ivan; Dørum, Cato; Nielsen, Steen Erik; Suikkanen, Pasi; Ren, Xiaobo; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Akselsen, Odd Magne (Peer reviewed; Journal article, 2020)
      High-power lasers are very effective in welding of plates thicker than 10 mm due to the keyhole mode. High-power intensity generates a vapor-filled cavity which provides substantial penetration depth. Due to the narrow and ...
    • Metallurgical Aspects in the Welding of Clad Pipelines—A Global Outlook 

      Bunaziv, Ivan; Olden, Vigdis; Akselsen, Odd Magne (Journal article; Peer reviewed, 2019)
      In the present work, the metallurgical changes in the welding of clad pipelines are studied. Clad pipes consist of a complex multi-material system, with (i) the clad being stainless steel or a nickel-based superalloy, (ii) ...
    • Porosity and solidification cracking in welded 45 mm thick steel by fiber laser-MAG process 

      Bunaziv, Ivan; Frostevarg, Jan; Ren, Xiaobo; Kaplan, Alexander F.H.; Akselsen, Odd Magne (Journal article; Peer reviewed, 2019)
      Porosity and solidification cracking in joining of thick sections are very common issues in deep penetration keyhole laser-arc hybrid welding (LAHW). In the present work, 45 mm thick high strength steel was joined by a ...
    • A Review on Laser-Assisted Joining of Aluminium Alloys to Other Metals 

      Bunaziv, Ivan; Akselsen, Odd Magne; Ren, Xiaobo; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Gulbrandsen-Dahl, Sverre (Peer reviewed; Journal article, 2021)
      Modern industry requires different advanced metallic alloys with specific properties since conventional steels cannot cover all requirements. Aluminium alloys are becoming more popular, due to their low weight, high corrosion ...
    • A Review on Laser-Assisted Joining of Aluminium Alloys to Other Metals 

      Bunaziv, Ivan; Akselsen, Odd Magne; Ren, Xiaobo; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Gulbrandsen-Dahl, Sverre (Peer reviewed; Journal article, 2021)
      Modern industry requires different advanced metallic alloys with specific properties since conventional steels cannot cover all requirements. Aluminium alloys are becoming more popular, due to their low weight, high corrosion ...
    • Root formation and mechanical properties in laser keyhole welding of 15 mm thick HSLA steel 

      Bunaziv, Ivan; Dørum, Cato; Nielsen, Steen Erik; Suikkanen, Pasi; Ren, Xiaobo; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Akselsen, Odd Magne (Peer reviewed; Journal article, 2021)
      Deep penetration laser welding is promising in joining thick (> 10 mm) steel sections. Focused laser beam by drilling vapour cavity, the keyhole, generates deep and narrow welds. Full penetration single-pass joining has a ...
    • Root formation and metallurgical challenges in laser beam and laser-arc hybrid welding of thick structural steel 

      Bunaziv, Ivan; Dørum, Cato; Nielsen, Steen Erik; Suikkanen, Pasi; Ren, Xiaobo; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Akselsen, Odd Magne (Peer reviewed; Journal article, 2021)
      Single-pass laser beam welding (LBW) of steel components with wall thickness of > 10 mm is of high interest due to enhanced productivity. Deep penetration LBW provides excessive hardness and certain quality issues such as ...