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

A technology of pre-plating copper and melting and brazing, which is applied to welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as difficult implementation, low recurrence rate of welded parts, poor quality of welds, etc., and achieve Efficiency improvement, realization of welding automation and good weld quality

Active Publication Date: 2011-07-06
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] combine figure 1 and figure 2 , taking a copper-plated steel stud with a diameter of 16mm and a height of 48mm as an example. First, chemically clean the surface of the aluminum base metal and the solder before welding. The specific cleaning process is: Etch the surface of the aluminum base metal with a NaOH solution with a concentration of 8% for 10 minutes, and the solder for 5 minutes. The mixed solution of nitric acid and hydrofluoric acid etched the surface of the aluminum base metal for 5 minutes, and the solder for 3 minutes (the proportion of the mixed solution is: 10 L of nitric acid solution with a concentration of 58%, and 0.3 L of a hydrofluoric acid solution with a concentration of 46%). Finally, clean the surface of the aluminum base metal with alcohol, dry it quickly, and then apply a layer of fluoride flux K on the surface of the base metal 3 AlF 6 -K 3 AlF 4 , fix the copper-plated steel stud on the surface of the aluminum base material with a cla...

Embodiment 2

[0031] combine figure 1 and figure 2 , taking a copper-plated steel stud with a diameter of 27mm and a height of 52mm as an example. First, chemically clean the surface of the aluminum base metal and the solder before welding. The specific cleaning process is: Etch the surface of the aluminum base metal with a concentration of 10% NaOH solution for 10 minutes, solder for 5 minutes, and the solution temperature is 50 ° C. After that, use The mixed solution of nitric acid and hydrofluoric acid etched the surface of the aluminum base metal for 6 minutes, and the solder for 3 minutes (the ratio of the mixed solution is: 10 L of nitric acid solution with a concentration of 61%, and 0.3 L of a hydrofluoric acid solution with a concentration of 50%). Finally, clean the surface of the aluminum base metal with alcohol, dry it quickly, and then apply a layer of fluoride flux K on the surface of the base metal 3 AlF 6 -K 3 AlF 4, fix the copper-plated steel stud on the surface of t...

Embodiment 3

[0033] combine figure 1 and figure 2 , taking a copper-plated steel stud with a diameter of 30mm and a height of 52mm as an example. First, chemically clean the surface of the aluminum base metal and the solder before welding. The specific cleaning process is: Etch the surface of the aluminum base metal with a NaOH solution with a concentration of 11% for 12 minutes, the solder for 6 minutes, and the solution temperature at 60 ° C. The mixed solution of nitric acid and hydrofluoric acid etched the surface of the aluminum base metal for 7 minutes, and the solder for 4 minutes (the ratio of the mixed solution is: 10L of nitric acid solution with a concentration of 64%, and 0.3L of a solution of hydrofluoric acid with a concentration of 55%). After cleaning, blow After drying, a layer of fluoride flux K is applied on the surface of the base metal 3 AlF 6 -K 3 AlF 4 , fix the copper-plated steel stud on the surface of the aluminum base material with a clamp and put a ceramic...

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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 whose surface is pre-plated with copper on an aluminum base material. Background technique [0002] The welding of steel studs and aluminum base metals is used in the automotive industry, hull cabins, petrochemicals, atomic energy, bridges and other fields. Stud welding is the method of welding metal studs or other similar fasteners to workpieces. For the welding of steel studs to steel base metal, the traditional arc stud welding process has been very mature. In view of the inherent characteristics of welding steel and aluminum dissimilar metal materials, arc stud welding is not suitable for welding steel studs to aluminum base metal. [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 weldin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/002B23K1/20B23K103/18
Inventor 王克鸿张德库金晓
Owner NANJING UNIV OF SCI & TECH
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