Patent
Method and material for resistance welding steel-base metal sheet to aluminum-base metal sheet
Hatsuhiko Oikawa,Yasuo Takahashi,Tohru Saito,Yutaka Okuda,Kazuo Narita,Fuminori Matsuda,Katsutoshi Ueno,Goro Watanabe +7 more
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TLDR
In this article, a resistance welding method was proposed for spot welding between a steel-base metal sheet, which has been plated for rust prevention purposes, and an aluminum base metal sheet and aims to permit a current to flow at a high density across the plated steel sheet and the aluminum-clad steel sheet, thereby realizing high quality welding.Abstract:
The present invention relates to a resistance welding method suitable for use in spot welding between a steel-base metal sheet, which has been plated for rust prevention purposes, and an aluminum-base metal sheet and aims to permit a current to flow at a high density across the plated steel sheet and the aluminum-clad steel sheet, thereby realizing high-quality welding. An aluminum-clad steel sheet comprised of a steel layer having projections and an aluminum layer is interposed between the plated steel sheet and the aluminum-base metal sheet to be welded to each other. An electrode is energized by a predetermined weld current from an alternating power supply. The current path is limited to the area of the projections, and metallic melt formed by melting of the plating is accommodated between the projections, preventing the current-carrying area from being increased. Consequently, the temperature of the interface of the plated steel sheet and the aluminum-clad steel sheet can be efficiently raised, resulting in the formation of a proper nugget on both sides of the aluminum-clad steel sheet.read more
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Patent
Process for lap joining two kinds of metallic members having different melting points
Shinji Okabe,Takanori Yahaba +1 more
TL;DR: In this paper, a blank made of a steel plate is lapped onto an Al-based plate in lapped areas of the Al alloy plate and another steel plate, and the three members are pressed by a pair of electrodes, and a welding current is allowed to flow between both the electrodes, thereby sequentially performing the melting of a current-supplied portion of the al- alloy and a portion near the current supplied portion, the elimination of a molten portion by a partial bulgy deformation of the blank toward the al alloy plate, the abutment of the bulgy
Patent
Welding electrode for aluminum sheets
TL;DR: In this article, a design of a copper welding electrode is presented, which can be used in successive spot welding operations on assembled aluminum alloy sheet parts of widely varying thicknesses, e.g., from 0.9 to 4+ mm.
Patent
Joined body of dissimilar materials comprising steel material and aluminum material, and joining method therefor
TL;DR: In this article, the purpose is to provide a joined body of dissimilar materials comprising steel material and aluminum material, which can be obtained by spot welding with high joining strength; and a spot welding method therefor.
Patent
Resistance spot welding of steel to pre-coated aluminum
TL;DR: In this paper, resistance spot welding of a steel workpiece to an aluminum or an aluminum alloy workpiece can be facilitated by replacing the refractory aluminum oxide-based layer(s) on at least the faying surface of the aluminum or aluminum Alloy workpiece with a protective coating that is more conducive to the spot welding process.
Patent
Multi-step direct welding of an aluminum-based workpiece to a steel workpiece
TL;DR: In this article, a workpiece stack-up that includes at least a steel workpiece and an aluminum-based workpiece can be resistance spot welded by employing a multi-stage spot welding method in which the passage of electrical current is controlled to perform multiple stages of weld joint development.
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Patent
Electrical resistance-pressure welding process for welding parts of workpieces made of aluminum materials and an apparatus and electrode therefor
TL;DR: In this article, the problem of achieving good quality welding and long electrode-life when using un-pretreated aluminum sheets is solved in principle by using electrodes having profiled contact-surfaces, by means of which the layer of oxide is broken during pre-pressing and a direct contact between the electrode and unoxidized material of the workpiece is provided, the contact-resistance of which is lower than the portion of the overall resistance of the point of weld formed by the aluminum sheets to be welded together.
Patent
Resistance welding of aluminum
TL;DR: In this paper, a resistor having a specific resistance at least two times that of aluminum is placed between two aluminum plates or between an aluminum plate and non-aluminum plate metal plate to be welded, and supplying an electric current through the aluminum plates to the resistor and the resistor.
Patent
Projection for resistance welding of soft metals
Paul Opprecht,Jurg Opprecht +1 more
TL;DR: In this article, a projection for use in electrical resistance welding of sheet metals and thin-wall parts is described, and a method of fabricating such projection and the use of the same are disclosed.
Patent
Method and apparatus for fusing characters to molded glass articles
TL;DR: In this paper, a method and an apparatus for applying fusible pigment to a molded glass article for forming characters and designs thereon was described, based on a prior patent No. 2,067,949.
Patent
Method for joining different metals
TL;DR: In this paper, the authors proposed a resistance welding method to widen the range of joining conditions under which the joining of different metals can be surely executed and to make it possible the joining between a stainless steel plate and Al plate being the above-mentioned different metals, and further to increase the strength of a joint part.