Evaluation of Influence of Thermal Methods of Metal Separation Cutting on Welding Quality

Abstract:

We have investigated a possibility of obtaining high-quality welded joints after oxygen and plasma cutting of steel С355 without removing the heat-affected zone (HAZ), in which the changes in chemical, phase and structural compositions are observed. Numerical and experimental studies of the effect of heat input of MAG and Submerged Arc welding on the quality of welded joints are performed. In particular, it was found that when the heat input of welding is at least 6.5 kJ/cm, the metal of HAZ of the edges after cutting is heated during the welding to temperatures above Ас3, which leads to its full recrystallization. When the heat input of welding is at least 10 kJ/cm, the edges after cutting are completely melted and become a part of the welding seam metal. The presence of extensive areas of melting and recrystallization of the edges in the welding process contributes to obtaining high-quality welded joints without removing the HAZ of the edges after cutting. To verify the results of numerical studies, experimental tests of control welded joints were conducted, which showed that the values of bending angle and impact toughness of the welding seam metal and heat affected zone are significantly above the regulatory requirements to quality of welded joints, and not less than the same requirements for steel С355. The obtained results confirm the possibility of revising domestic regulatory requirements for the steel constructions production in terms of the preparation of edges for welding using technologies of thermal cutting without subsequent machining.

• Periodical: Solid State Phenomena (Volume 265)
• Pages: 755-761
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.265.755
• Online since: September 2017
• Authors: A.K. Tingaev*, M.A. Ivanov, A.M. Ulanov
• Keywords: Edge of the Sample, Hardness, Heat Affected Zone, Impact Toughness, Low Alloy Steel, Oxy-Fuel Cutting, Plasma Cutting, Strength, SYSWELD, Welding

References

[1] Yu.A. Pykin, S.V. Anakhov, I. Yu. Pyshmintsev, D.V. Ovchinnikov, V.A. El'kin, About the effectiveness of application of plasma technology in the cutting of tubular steel products, Rolling production, 1 (2014) P. 38-45.

[2] SR 86. 13330. 2014, A set of rules. Major pipelines. Updated edition SNiP III-42-80. Moscow, Prospect, (2016).

[3] STO-SA-03-002-2009, Rules for the design, manufacture and installation of vertical cylindrical steel tanks for petroleum and petroleum products, Team of authors, Association Rostekhekspertiza, Moscow, (2009).

[4] RD 34. 15. 132-96, Welding and quality control of welded joints of metal constructions of buildings in the erection of industrial facilities, NPO OBT, Moscow, (2001).

[5] S.V. Anakhov, K. Singep, Yu.A. Pykin, S.A. Shakupov, The study of cut surface in thermal separation cutting of steel 09G2S, Welding production, 7 (2007) 17-21.

DOI: 10.1080/09507110802141974

[6] А.K. Tingaev, А.K. Gubaydulin, I.A. Ilin, Study of the effect of thermal cutting on the microstructure and chemical composition of the edges of workpieces made of steel brands S345, S390, Procedia Engineering, 150 (2016) 1783-1790.

DOI: 10.1016/j.proeng.2016.07.171

[7] R. Janco, P. Elesztos, Thermal field simulation of repair threads in a hole in the cover of a pressure vessel by welding using sysweld, (2017).

[8] J.B. Ji, J.Z. Zhang, L. Zhang, Numerical simulation and testing of 45 architecture steel welded based on Gaussian heat source, (2014).

DOI: 10.4028/www.scientific.net/amm.580-583.3187

[9] I.G. Shirshov, V.N. Kotikov, Plasma cutting, Mechnical Engineering, Leningrad, (1987).

[10] GOST 23118-2012, Steel building constructions, General technical conditions, Standartinform, Moscow, (2012).

[11] SP 70. 13330. 2012, Bearing and fencing constructions, Updated edition SNiP 3. 03. 01-87, Prospect, Moscow, (2016).

[12] GOST 27772-2015, Rolled products for building steel constructions, General technical conditions, Standartinform, Moscow, (2015).

[13] S.V. Anakhov, S.V. Gladkovskiy, S.V. Lepikhin, Yu.A. Pykin, A.V. Matushkin, Mechanical and technological properties of welded joints obtained after the application of plasma cutting, Welding production, 6 (2016) 8-14.

DOI: 10.1080/09507116.2016.1268761

[14] S.V. Anakhov, Yu.A. Pykin, D.A. Golotvin, A.V. Matushkin, Analysis of strength and plasticity of welded joints obtained with the use of plasma cutting technology, Welding and diagnostics, 1 (2016) P. 37-40.