Method of pre-copper-plated induction welding-brazing of aluminum-steel stud bolt

Abstract

The invention discloses a method of pre-copper-plated induction welding-brazing of an aluminum-steel stud bolt, which comprises the following steps: processing a steel stud bolt into a flat-bottom no-nut-cap type and conducting copper immersion plating to one end of the steel stud bolt; carrying out chemical cleaning to the surface of an aluminium base material and brazing filler metal; cleaning the surface of an aluminium base material and a brazing filler metal with alcohol, fast drying, and coating a layer of brazing protective agent on the surface of the base material; horizontally placing the aluminum base material, vertically placing the copper-plated end of the steel stud bolt on the aluminum base material, applying vertical downward pressure on the copper-plated end of the steel stud bolt, and filling enough cleaned brazing filler metal on the contact surface of the two; placing a ceramic ring matched with the stud bolt at the contact position of the copper-plated end of the steel stud bolt and the aluminum base material, and filling the brazing filler metal in the ceramic ring; and sheathing an induction heating coil at a welding end of the stud bolt, heating the induction heating coil and completing the welding. The invention can realize the welding of the small-diameter steel stud bolt and the aluminum base material, and has wide range of application to the thickness of plates.

Description

Technical field [0001] The invention relates to a welding technology for welding a steel stud on an aluminum alloy substrate, in particular to a welding method for a steel stud with a surface pre-plated copper on an aluminum base material. Background technique [0002] The welding of steel studs and aluminum base metal is used in the automotive industry, ship hull cabins, petrochemicals, atomic energy, bridges and other fields. Stud welding is a method of welding metal studs or other similar fasteners to a workpiece. For the welding of steel studs to the steel base metal, the traditional arc stud welding process has been very mature. In view of the inherent characteristics of welding of steel and aluminum dissimilar metal materials, the method of arc stud welding is not suitable for welding steel studs to aluminum base materials. [0003] Although the welding of steel and aluminum dissimilar metals as a difficult problem in the welding field has developed to a mature stage, effec...

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Problems solved by technology

[0003] As a difficult problem in the field of welding, the welding of steel and aluminum dissimilar metals has developed to a mature stage, but the effective welding method excludes fusion welding from the welding method, even if the welding is well formed and the weld strength is strong. The reproducibility rate of the piece is still low

Welding steel studs to aluminum base metal is a special welding form of steel and aluminum dissimilar metals. The welding method is mainly used for welding. The main problems in welding are: 1. How to effectively remove the surface of the aluminum base metal Oxide film and prevent its secondary generation, because aluminum alloy is a very active metal, even if it is chemically cleaned before welding, a dense oxide film will be formed on the surface

At present, the main method of welding steel studs to aluminum base metal is TIG / MIG arc brazing. Due to equipment reasons, welding of certain shapes of weldments is difficult to implement and the quality of welds is also poor.

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