Abstract
Urgency of the research. Aluminum alloys are widespread materials in constructions of different branches of industry. Apart from ensuring the strength of permanent joints in typical units of constructions, their production requires to retain their designed form.Target setting. Precision joining of aluminum alloys by pressure welding is complicated owing to their high thermoplastic properties, heat- and electro conductivity. It requires the search of effective methods for obtaining products with low deformation level.Actual scientific researches and issues analysis. One of perspective joining methods of aluminium alloys is precision electric resistance welding through intermediate layers of aluminium foil. Their application promotes to localization of heat energy in the contact of welded components and decrease of product deformation level.Uninvestigated parts of general matters defining. Heat release process in the contact of welded components during electric resistance butt-welding of aluminum alloys through interlayers remains unstudied.The research objective. Aim of this paper is the development of precision electric resistance welding of aluminium alloys.The statement of basic materials. The investigation of heat release process has been carried out by estimated way with using of finite-element modeling. The joining of aluminum alloy 6063 has been realized by electric resistance butt-welding through intermediate layers of aluminum 1050 foil by thickness 11 μm. Welding conditions: the current density 300 A/mm2, the specific pressure 8 MPa, the welding time 0.5‑0.7 sec.Conclusions. It is shown, that quantity of heat generated in the contact zone during electric resistance butt-welding depends on number of layers in the interlayer. It has been determined that welding of aluminum alloy 6063 under offered conditions through 6 layers of aluminum foil allows to obtain welded joints with strength by 95 % from base metal strength and deformation level up to 2 %.
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