2021 №11 (02) DOI of Article
2021 №11 (04)

Automatic Welding 2021 #11
Avtomaticheskaya Svarka (Automatic Welding), #11, 2021, pp. 15-20

Investigations of the quality of welded joints of pipes from steel of ASTM A106/API 5L grade, using magnetically impelled arc butt welding

V.S. Kachinskyi1, Yupiter HP Manurung2
1.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
2Smart Manufacturing Research Institute (SMRI) and School of Mechanical Engineering, UiTM Shah Alam, Malaysia

Magnetically-impelled arc butt welding (MIAB) is a welding process applied for joining pipes with an external magnetic field, which influences the arc displacement in a narrow gap between the pipe end faces. This welding process consists of a complex interaction between the electric arc, external magnetic field and upset value. In this work, investigations were performed on MIAB welding of seamless pipes from carbon steel of ASTM A106/API 5L grade, which is used in electric power plants, boilers, petrochemical plants, petroleum processing plants and ships, where the pipeline should transport liquids and gases under high pressure and temperature. The experimental procedure includes a range of tests for development and assessment of the knowledge base on MIAB welding of seamless pipes. Then mechanical testing of MIAB welded joints of ASTM A106/API 5L sample to assess its strength and weld integrity in keeping with API 1104 standard. In addition to investigations, a conceptual specification of MIAB welding procedure and protocol of welding procedure qualification for welding pipes and their further application were developed and presented. The experimental results emphasized that the MIAB welded joints demonstrate the high strength and good integrity of the weld on the level of the pipe base metal. Thus, MIAB welding can be regarded as the future fast and cost-effective welding process without expensive use of filler materials and shielding gas. 15 Ref., 5 Tabl., 10 Fig.
Keywords: press welding, magnetically-impelled arc, seamless pipes, carbon steel, welded joints, mechanical properties

Received: 21.09.2021


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