Method for improving strength of aluminum-steel dissimilar metal laser fusion welding-brazing lap joint
A dissimilar metal and lap joint technology, which is applied in the field of improving the strength of aluminum-steel dissimilar metal laser fusion brazing lap joints, and can solve problems such as energy shortage
Inactive Publication Date: 2019-12-03
SHANGHAI JIAO TONG UNIV
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[0003] In the process of laser melting and brazing of steel and aluminum dissimilar metals, the beam acts on the surface of the aluminum plate to melt the aluminum and spread on the surface of the steel plate to form a brazing seam. For the weld edge area away from the welding heat source, the energy obtained is very insufficient
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[0031] The invention discloses a method for improving the strength of an lap joint of aluminum-steel dissimilar metals laser fusion brazing, which is mainly suitable for laser fusion-brazing welding of steel and aluminum dissimilar metals to improve the performance of the welded joint. The main principle of the present invention is to add a second laser beam directly on the steel plate to provide sufficient heat input for the weld head region away from the main beam to ensure the formation of the necessary aluminum-steel intermetallic compounds, thereby enhancing the strength of the interface layer This improves the performance of welded joints. The main steps of the invention are as follows: the main laser beam energy completely acts on the aluminum plate to melt the base material; the second laser beam is introduced to act on the surface of the galvanized steel sheet to supplement the heat source; the molten aluminum base material is freely spread on the steel plate The surf...
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Abstract
The invention discloses a method for improving the strength of an aluminum-steel dissimilar metal laser fusion welding-brazing lap joint, and relates to the field of metal laser welding. The method comprises the following steps: step 1, cleaning oil stains on the surface of an aluminum alloy, and removing an oxide film on the surface of the aluminum alloy; 2, performing aluminum-steel dissimilar joint lap welding by adopting double laser beams, with the main laser beam being irradiated to an aluminum plate and the second laser beam being irradiated to a steel plate; 3, completely acting the energy of the main laser beam on the aluminum plate to melt the base metal, and freely spreading the molten aluminum base metal on the surface of the steel base metal to form a fusion welding-brazing joint; and 4, acting the second laser beam on the surface of the steel plate, heating edge molten aluminum spread on the surface of the steel plate base metal so that the molten aluminum and the steel plate form an intermetallic compound layer again. The second laser beam which is additionally arranged directly acts on the surface of the steel plate, and the technical effect of improving the performance of a welding joint is achieved.
Description
technical field [0001] The invention relates to the field of laser welding of aluminum-steel dissimilar metals, in particular to a method for improving the strength of an lap joint of aluminum-steel dissimilar metals laser welding and brazing. Background technique [0002] When aluminum-steel is welded, due to the poor metallurgical compatibility of the two, it is difficult to realize the connection by solid mutual dissolution, and the contact between the two will inevitably form a hard and brittle phase of the aluminum-steel intermetallic compound. Although an excessively thick intermetallic compound layer at the brazing interface will drastically impair the performance of the joint, the formation of a certain amount of intermetallic compound layer is a necessary condition for the realization of aluminum-steel connection. [0003] In the process of laser welding and brazing of dissimilar metals of steel and aluminum, the beam acts on the surface of the aluminum plate to mel...
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IPC IPC(8): B23K26/046B23K26/08B23K26/14B23K26/21B23K26/352B23K26/60B23K26/70B23K103/18
CPCB23K26/046B23K26/08B23K26/14B23K26/21B23K26/352B23K26/60B23K26/702B23K2103/18
Inventor 崔海超袁锐田可嘉邓胜杰芦凤桂唐新华
Owner SHANGHAI JIAO TONG UNIV