TY - JOUR

T1 - Investigation of the mechanical properties and corrosion behaviour of hybrid L 80 Type 1 and duplex steel joints produced by magnetically impelled arc butt welding

AU - Hassel, Thomas

AU - Maier, Hans Jürgen

AU - Alkhimenko, Alexey

AU - Davydov, Artem

AU - Shaposhnikov, Nikita

AU - Turichin, Gleb

AU - Klimova, Olga

N1 - Funding Information: The research was supported on the German side within the framework of the Lower Saxony Research Network "Geothermal Energy and High-Performance Drilling Technology" (GeBo) funded by the Lower Saxony Ministry of Science and Culture (project no. ZN2481GeBoW5 and ZN2481GeBoW6 ) and from the Russian side by the Ministry of Science and Higher Education of the Russian Federation as part of World-class Research center program: Advanced Digital Technologies (contract No. 075–15–2020–934 dated on 17.11.2020)

PY - 2022/6

Y1 - 2022/6

N2 - In the field of deep geothermal energy, the mono-tube design will be increasingly used in the future, as significant cost savings can be expected in the production of boreholes up to depths of 6000 m. The previously used bolting of the pipe lengths by means of sleeves contributes significantly to the construction costs. In addition, there is an increased risk of failure for the sleeve bolting, especially if different materials have to be used in different layers for the purpose of increasing the corrosion resistance. Magnetically Impelled Arc Butt Welding (MIAB) was used for direct welding of pipe segments with complete elimination of socket bolting. In the process, the casing material (L80 Type 1), which is a cost-effective standard material, and a corrosion-resistant duplex steel (1.4462) were hybrid welded. The results show excellent properties both in terms of mechanical properties and corrosion resistance. It is shown that the advantages of the MIAB process in joining these different materials can successfully overcome the metallurgical challenges. This new approach for the production of borehole liners can contribute significantly to cost reduction in the construction of geothermal boreholes.

AB - In the field of deep geothermal energy, the mono-tube design will be increasingly used in the future, as significant cost savings can be expected in the production of boreholes up to depths of 6000 m. The previously used bolting of the pipe lengths by means of sleeves contributes significantly to the construction costs. In addition, there is an increased risk of failure for the sleeve bolting, especially if different materials have to be used in different layers for the purpose of increasing the corrosion resistance. Magnetically Impelled Arc Butt Welding (MIAB) was used for direct welding of pipe segments with complete elimination of socket bolting. In the process, the casing material (L80 Type 1), which is a cost-effective standard material, and a corrosion-resistant duplex steel (1.4462) were hybrid welded. The results show excellent properties both in terms of mechanical properties and corrosion resistance. It is shown that the advantages of the MIAB process in joining these different materials can successfully overcome the metallurgical challenges. This new approach for the production of borehole liners can contribute significantly to cost reduction in the construction of geothermal boreholes.

KW - Borehole casing

KW - Geothermal wells

KW - Hybrid joining

KW - Magnetically impelled arc butt welding (MIAB)

KW - Tube welding

UR - http://www.scopus.com/inward/record.url?scp=85129621257&partnerID=8YFLogxK

U2 - 10.1016/j.jajp.2022.100109

DO - 10.1016/j.jajp.2022.100109

M3 - Article

AN - SCOPUS:85129621257

VL - 5

JO - Journal of Advanced Joining Processes

JF - Journal of Advanced Joining Processes

SN - 2666-3309

M1 - 100109

ER -