Structure and Crack Resistance of N-A-XTRA-70 Steel Joints Manufactured by Hybrid Laser-Arc Welding

Abstract:

Article Preview

Crack resistance of welded joints is one of the most important indices of service reliability of critical designation structures. The purpose of the research is the establishment of the influence of technological modes, hybrid laser-arc welding of high strength steel NA-XTRA-70 on the formation of structure in the metal welded joints, as well as analysis of the influence of this structure on their crack resistances. For the experiments the laboratory setup has been developed on which the experiments were carried out in the technological scheme that provides the location of the consumable electrode arc at a certain distance in front of the laser beam in the welding direction. Nd: YAG-laser DY 044 of company ROFIN (Germany) was a laser radiation source. Power for consumable electrode arc was carried out by welding generator PSG-500. Investigations of structural-phase changes in weld metal and HAZ were carried out by means of optical microscopy (optical microscope Versamet-2 and Neophot-32), microhardness was measured using M-400 gage of Leco company at 0.98N loading. Fractographic investigations were carried out by scanning electron microscopy (scanning electron microscope SEM-515 of PHILIPS company, Netherlands) on fractured specimens of welded joints, made as a result of impact bend tests. An analysis of crack resistance of the welded joints was carried out under different conditions of test temperatures. It was based on experimental data, received by a quantitative fractography method. It is shown that metal of a welded joint produced by hybrid laser-arc welding at Vw = 72m/h rate has mainly failure of ductile nature after external loading. This indicates sufficient level of crack resistance and further working capacity under operation conditions.

Info:

Periodical:

Edited by:

Dr. Dmitry A. Chinakhov

Pages:

29-34

Citation:

V. Pozniakov et al., "Structure and Crack Resistance of N-A-XTRA-70 Steel Joints Manufactured by Hybrid Laser-Arc Welding", Materials Science Forum, Vol. 927, pp. 29-34, 2018

Online since:

July 2018

Export:

Price:

$38.00

[1] K. Madej, R. Jachym, Welding of High Strength Toughened Structural Steel S960QL, Biuletyn Instytutu Spawalnictwa 2 (2017) 6-16.

DOI: https://doi.org/10.17729/ebis.2017.2/1

[2] K. Madej, S. Świdergoł, P. Jakubiec, Analysis of Cracks in Welded Joints of Pipes with Eyes made of S890QL1 Steel. Biuletyn Instytutu Spawalnictwa 6 (2015) 11-22.

DOI: https://doi.org/10.17729/ebis.2015.6/2

[3] D.P. Il'yaschenko, D.A. Chinakhov, V.I. Danilov, G.V. Schlyakhova, Yu.М. Gotovshchik, Physical Nature of the Processes in Forming Structures, Phase and Chemical Compositions of Medium-Carbon Steel Welds. IOP Conf. Series: Materials Science and Engineering 91 (2015) 012006.

DOI: https://doi.org/10.1088/1757-899x/91/1/012006

[4] O. Berdnikova, V. Sydorets, T. Alekseienko, Structure and Properties of Laser-Welded Joints from High-Strength Steels. Applied Mechanics and Materials 682 (2014) 240-245..

DOI: https://doi.org/10.4028/www.scientific.net/amm.682.240

[5] O. Berdnikova, V. Poznyakov, O. Bushma, Laser and hybrid laser-arc welding of high strength steel N-A-XTRA-70. Materials Science Forum 870 (2016) 630-635..

DOI: https://doi.org/10.4028/www.scientific.net/msf.870.630

[6] L. Markashova, O. Berdnikova, A. Bernatskyi, M. Iurzhenko, V Sydorets, Physical and mechanical properties of high-strength steel joints produced by laser welding. In Young Scientists Forum on Applied Physics and Engineering (YSF), IEEE International (2017) 88-91..

DOI: https://doi.org/10.1109/ysf.2017.8126596

[7] D.P. Il'yaschenko, D.A. Chinakhov, V.I. Danilov, I.D. Sadykov, Physical Nature of the Processes in Structure Forming, Phase and Chemical Composition of pipe Permanent Joints when MMA Welding. IOP Conf. Series: Materials Science and Engineering 125(2016) 012010.

DOI: https://doi.org/10.1088/1757-899x/125/1/012010

[8] M. Różański, S. Stano, A. Grajcar, Effect of Braze Welding Parameters on the Structure and Mechanical Properties of Joints Made of Steel CPW 800. Part 1: Arc Braze Welding. Biuletyn Instytutu Spawalnictwa 6 (2016) 6-12.

DOI: https://doi.org/10.17729/ebis.2016.6/1

[9] D.P. Il'yaschenko, D.A. Chinakhov, V.I. Danilov, G.V. Schlyakhova, Y.M. Gotovschik, Increasing Strength and Operational Reliability of Fixed Joints of Tubes by ММА Welding. IOP Conf. Series: Materials Science and Engineering 91 (2015) 012007.

DOI: https://doi.org/10.1088/1757-899x/91/1/012007

[10] G. Libovits (ed.). Fracture. Vol.3. Mir, Moscow, (1976).

[11] M.A. Balter, A.P. Lyubchenko, S.I. Aksenova. Fractography – a Diagnostic Tool of Destroyed Details. Mashinostroenie, Moscow, (1987).

Fetching data from Crossref.
This may take some time to load.