Browsing NTNU Open by Author "Bunaziv, Ivan"
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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 (Journal article; Peer reviewed, 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. (Peer reviewed; Journal article, 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 ... -
Effect of preheating and preplaced filler wire on microstructure and toughness in laser-arc hybrid welding of thick steel
Bunaziv, Ivan; Langelandsvik, Geir; Ren, Xiaobo; Westermann, Ida; Rørvik, Gisle; Dørum, Cato; Danielsen, Morten Høgseth; Eriksson, Magnus Carl Fredrik (Peer reviewed; Journal article, 2022)Acicular ferrite (AF) is the most important microstructural constituent to achieve high toughness at low temperatures in weld metal of steels. This is due to the relatively small grain size and large misorientation angles. ... -
Fiber Laser-MAG Hybrid Welding of Structural Steels for Arctic Applications
Bunaziv, Ivan (Doctoral theses at NTNU;2018:149, Doctoral thesis, 2018) -
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 (Journal article; Peer reviewed, 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. (Journal article; Peer reviewed, 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 ... -
Understanding the inoculation of aluminium grains during welding under the influences of high cooling rate and high temperature gradient
Xu, Yijiang; Langelandsvik, Geir; Bunaziv, Ivan; Li, Yanjun (Peer reviewed; Journal article, 2023)Inoculation is an important method to generate fine equiaxed grain structures in alloys during solidification, which is widely used in shape casting and direct chill casting processes of aluminium alloys. Different from ...