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ArticleName Experimental study of the change in ovality of large-diameter pipes taking into account the welding deformations effect
ArticleAuthor M. A. Tovmasyan, S. V. Samusev

National University of Science and Technology “MISiS” (Moscow, Russia):

M. A. Tovmasyan, Post-Graduate, e-mail:
S. V. Samusev, Dr. Eng., Prof.


The results of studies to assess the effect of stresses and strains that occur during welding on a pipe shape in the transverse direction have been presented. To determine the pipe ovality, measurements of the gap width, horizontal and vertical diameter after each deformation process at the incremental forming - expansion stage were made. The results of ovality measurements for the front and rear ends of pipes (1219 × 17.5 of K65 strength class; 1220 × 20 mm, 1220 × 17.3 mm of K60 strength class; 1220 × 12 mm, 1020 × 10 mm of K52 strength class) after the incremental forming, assembling and welding of the technological seam, internal and external seams and expansion, as well as changes in ovality after each process under consideration were presented. Pipes of K52 strength class with a diameter to wall thickness ratio of 101.6 had the largest deviation in ovality, the smallest (55) had pipes of K60 strength class, pipes of K65 strength class had a value of 69.7. When welding the inner and outer seams, the vertical diameter increases, and the horizontal diameter decreases. The total change in the ovality of pipes because of residual welding strains is 0.7–3 %. After welding the outer seam, 7 % of the pipes had a horizontal oval at the rear end and 1 % at the front end. After expansion, most of the pipes had a horizontal oval, and the ovality value of the pipes at the rear end exceeded the ovality value of the pipes at the front end. In order to assess the change in the pipe shape in the heat-affected zone, we measured pipe diameters of 1220 × 17.3 mm of the K60 strength class at a distance of 100 mm from the weld and the deviation from the theoretical circumference in the marginal zone before and after expansion. The greatest deviation from the theoretical circle to the oval for the front and rear ends had pipes with the “apple” shape in the marginal zone.

keywords Large-diameter electric-welded pipes, welding strains, residual stresses, ovality of pipes, change in ovality, JCOE technology, forming, welding, expansion, deviation from the theoretical circle

1. Velichko А. А., Bortsov А. N., Shabalov I. P. et. al. Interrelation of thermal processes with morphology of welded joints and promising kind of welding with reference to thick-walled electrowelded pipes. Metallurg. 2014. No. 3. pp. 72–77.
2. Om H., Pandey S. Effect of heat input on dilution and heat affected zone in submerged arc welding process. Sadhana. 2013. Vol. 38. Iss. 6. pp. 1369–1391.
3. Gutiérrez P. H., Rodríguez F. C., Mondragón J. R. Thermo-mechanic and Microstructural Analysis of an Underwater Welding Joint. Soldagem & Inspeção. 2016. Vol. 21 (2). pp. 156–164.
4. Efron L. I.Metal science in «great» metallurgy. Tube steels. Moscow: Metallurgizdat, 2012. 696 p.
5. Gurevich S. М., Zamkov V. N., Blashchuk V. Е. et. al. Metallurgy and technology of welding titanium and alloys on its base. Kiev: Naukova dumka, 1986. 240 p.
6. Muravev V. I., Bakhmatov P. V., Pletnev N. О., Debelyak А. А. Effect of stress state on the structure and properties when welding structures from steel and alloys. Izvestiya vysshikh uchebnykh zavedeny. Chernaya metallurgiya. 2016. Vol. 59 (4). pp. 251–255.
7. Matveev М. Yu., Ivanov V. Ya. Grum-Grzhimaylo N. А. Manufacture of large-diameter electrowelded pipes. Moscow: Metallurgiya, 1968. 192 p.
8. Matveev М. Yu., Ruzhinsky М. B., Romashov А. А. et. al. Technology for electrowelded pipes production. Moscow: Metallurgiya, 1967. 164 p.
9. Soul F., Hamdy N. Numerical Simulation of Residual Stress and Strain Behavior after Temperature Modification. Welding Processes. 2012. Chapter 10. pp. 217–246.
10. Okerblom N. О. Welding deformations and stresses. Leningrad: Mashgiz, 1948. 271 p.
11. Kung C. L., Hung C. K., Hsu C. M., Chen C. Y. Residual Stress and Deformation Analysis in Butt Welding on 6 mm SUS304 Steel with Jig Constraints Using Gas Metal Arc Welding. Applied sciences. 2017. Vol. 7 (10). DOI: 10.3390/app7100982.
12. Nóbrega J., Diniz D., Silva A. Numerical Evaluation of Temperature Field and Residual Stresses in an API 5L X80 Steel Welded Joint Using the Finite Element Method; Metals. Brazil. 2016. Vol. 6. (28). DOI: 10.3390/met6020028.
13. Nerovny V. М. et. al. Theory of welding processes: tutorial for universities. 2nd edition. Moscow: Izdatelstvo MGTU im. N. E. Baumana, 2016. 702 p.
14. Shinkin V. N. Calculation of technological parameters of O-forming press for manufacture of large-diameter steel pipes. CIS Iron and Steel Review. 2017. Vol. 13. pp. 33–37.
15. Samusev S. V., Tovmasyan М. А. Mathematical and physical modeling incremental forming processes using the JCOE scheme on a laboratory machine of JSC VMZ TsIL ITTs. Proizvodstvo prokata. 2014. No. 11. pp. 16–21.
16. Tovmasyan М. А., Samusev S. V., Sazonov V. А. Study of the largediameter tubes forming process using modern computer systems. Metallurg. 2016. No. 2. pp. 54–58.
17. Samusev S. V., Khlybov O. S., Drozdov L. V., Kerenzev D. E. Experimental investigation of tube billet forming via photogrammetry method at the area of a flanging press in TESA 1420 line. Izvestiya vysshikh uchebnykh zavedeny. Chernaya metallurgiya. 2014. No. 5. pp. 15–18. DOI: 10.17073/0368-0797-2014-5-15-18.

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