Avtomaticheskaya Svarka (Automatic Welding), #3, 2016, pp. 25-30
Peculiarities of formation of structure of welded joints in arc surfacing with pulse feed of electrode wire
V.A. Lebedev1, I.V. Lendel1, A.V. Yarovitsyn1, E.I. Los1 and S.V. Dragan2
1E.O. Paton Electric Welding Institute, NASU. 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: email@example.com
2National Shipbuilding University 19 Geroev Staliningrada Ave., 54025, Nikolaev, Ukraine
It is shown that process of CO2 arc surfacing with pulse feed of electrode wire in contrast to its continuous feed is characterized by increased stability, lower loss of electrode metal for spattering and improved characteristics of wear resistance of 30KhGSA deposited metal. determined was an optimum range of parameters of electrode wire pulse feed, namely frequency 10–30 Hz and relative pulse duration 3–5 units. It is shown that reduction of penetration depth of base metal is achieved due to current decrease at stage of droplet growth in elementary cycle of electrode metal transfer. Comparative examination of microstructure of deposited metal and HAZ was carried out employing scanning electron microscopy at continuous and pulse feed of electrode wire at ×(500–2000) magnifications. 18 Ref., 2 Tables, 10 Figures.
Keywords: arc welding, surfacing, pulse algorithms, feed system, electrode wire, welded joint, microstructure
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