2018 №01 (08) DOI of Article
2018 №01 (02)

Automatic Welding 2018 #01
Avtomaticheskaya Svarka (Automatic Welding), #1, 2018, pp. 7-14
Effect of parameters of arc, laser and hybrid methods of welding on structure and properties of butt joints of high-strength steel S460M

V.D. Poznyakov, V.D. Shelyagin, S.L. Zhdanov, A.V. Bernatsky, A.A. Maksymenko and A.V. Siora
E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
The paper studies the effect of parameters of arc, laser and hybrid laser-arc welding on formation of structure and properties of weld metal and heat-affected zone of butt joints from high-strength low alloy steel S460M with yield point up to 480 MPa. It is shown that increase of rate of gas-shielded arc welding to 50 m/h (13.9 mm/s) allows receiving a quality weld with increased indices of static strength and impact toughness. Laser welding with increased cooling rate provokes reduction of the indices of ductility and impact toughness of weld metal that is related with formation of martensite hardening structure of weld metal and heat-affected zone of the welded joints revealing at higher cooling rate. Application of hybrid laser-arc welding method of steel S460M allows decreasing cooling rate of weld metal and heat-affected zone in comparison with laser welding method. This provides high level of mechanical properties and impact toughness of metal of these zones. 16 Ref., 1 Table, 5 Figures.
Keywords: butt joints, high-strength steel, arc welding, laser welding, hybrid laser-arc welding, thermal cycle, structure peculiarities, mechanical properties
Received:                27.11.17
Published:               15.02.18
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