Automatic Welding, 2023, №11



2023 №11 (01)

DOI of Article 10.37434/as2023.11.02

2023 №11 (03)

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Avtomaticheskaya Svarka (Automatic Welding), #11, 2023, pp. 23-31

Influence of GMAW and PAW methods of additive arc surfacing and shielding gas composition on surface geometry and metal structure

V.V. Kvasnytskyi, I.M. Lagodzinskyi

NTUU «Kyiv Igor Sikorsky Polytechnic Institute. 37 Beresteiska Ave., 03056, Kyiv. E-mail: kvas69@ukr.net

With development of Wire Arc Additive Manufacturing (WAAM) technologies there is the need to ensure stable quality characteristics of spatial products, and it is desirable to obtain a final surface with minimal geometrical inhomogeneity. Arc surfacing, in particular the process with short-circuiting (Cold Metal Transfer – CMT), and pulse-arc surfacing (Pulse process) allow greater control of weld pool melt behaviour, and reducing material losses for spatter and burn-out, which ensures higher productivity of the process. At the same time, investigations of the regularities of the influence of arc melting methods, in particular CMT, Pulse and PAW technologies, and composition of shielding gas atmosphere on the formed layer geometry, deposited metal structure and proneness to defect formation are urgent. Analysis of sample geometry indicates that the shielding gas mixture composition has an essential influence on the deposited layer height, irrespective of the surfacing method (CMT/Pulse). So, for М11 mixture the height of individual beads increases by 0.4…11.7 %, compared to use of М21 mixture. Application of pulsed current leads to 10…11 % increase in the bead width, compared to CMT process. Metallographic studies reveal product structure typical for multilayer surfacing. No clear boundary between the deposited metal layers was found. 18 Ref., 2 Tables, 9 Fig.
Keywords: WAAM, GMAW, Cold Metal Transfer, plasma, additive technologies, 09G2S, layer-by-layer surfacing, shielding gas mixture


Received: 25.10.2023

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