2021 №12 (01) DOI of Article
2021 №12 (03)

The Paton Welding Journal 2021 #12
The Paton Welding Journal, 2021, #12, 9-17 pages

Features of laser-plasma welding of corrosion-resistant steel AISI 304 with laser application

V.M. Korzhyk1, V.Yu. Khaskin1, A.A. Grynyuk2, E.V. Illyashenko2, A.V. Bernatskyi2, S.I. Peleshenko3

1China-Ukraine E.O. Paton Institute of Welding of the Guangdong Academy of Sciences, Guandong Key Laboratory of Advanced Welding Technologies, Guangzhou, China
2E.O. Paton Electric Welding Institute of the NASU 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine
3National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» 37 Peremohy Ave., 03056, Kyiv, Ukraine

The paper confirms the presence of synergistic effect at laser-plasma welding, using fiber laser, by comparing the cross-sectional areas of penetrations, made in AISI 304 plate (δ = 4 mm) by laser, plasma, and hybrid processes at close power values of laser radiation and plasma arc (~2 kW each). It is determined that the manifestation of this effect depends on welding speed. At the speed of 2 m/min the hybrid penetration cross-sectional area can exceed the sum of areas of penetrations produced with the laser and plasma processes by up to 30 %, and for the speed of 4 m/min by ~20 %. Comparison of input energy of the laser and hybrid processes of stainless steel welding showed that the difference between them depends on the welded sheet thickness (or penetration depth). This value first decreases from ~100 % for sheets with δ = 2 mm to 50 % for sheets with δ = 6 mm, and at further increase of penetration depth it rises to 60 %. The nature of dependencies of the factor of area ratio φ, weld geometry К and penetration depth Ф on the speed of hybrid welding of AISI 304 steel allows recommending the range of speeds of 1.5–2.0 m/min, as a more acceptable one by the criteria of synergistic effect and penetration depth. It is found that at hybrid welding with application of fiber laser radiation, the plasma component promotes elimination of such defects of weld upper bead formation, characteristic for laser welding, as undercuts and a ridge, etc.
Keywords: hybrid laser-plasma welding, fiber laser, stainless steel, synergistic effect, penetration depth, energy input

Received 18.10.2021
Accepted: 24.12.2021


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