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

A pre-plating copper and soldering technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as difficult implementation, poor quality of welds, and low recurrence rate of welded parts, and achieve Efficiency improvement, good weld quality, and the effect of realizing welding automation

Active Publication Date: 2013-06-05
NANJING UNIV OF SCI & TECH
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  • Summary
  • 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

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Combine figure 1 with figure 2 Take 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 8% NaOH solution for 10 minutes, the solder for 5 minutes, and the solution temperature is 40 ℃. The mixed solution of nitric acid and hydrofluoric acid etches the surface of the aluminum base metal for 5 minutes, and the brazing filler metal for 3 minutes (the mixture ratio is: 10L of nitric acid solution with a concentration of 58%, and 0.3L of hydrofluoric acid solution with a concentration of 46%). Finally, the surface of the aluminum base material is cleaned with alcohol and dried quickly, and then a layer of fluoride flux K is applied to the surface of the base material 3 AlF 6 -K 3 AlF 4 , Fix the copper-plated steel stud on the surface of the aluminum base material wi...

Embodiment 2

[0031] Combine figure 1 with figure 2 Take 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 10% NaOH solution for 10 minutes, the solder for 5 minutes, and the solution temperature is 50°C. The mixed solution of nitric acid and hydrofluoric acid etches the surface of the aluminum base metal for 6 minutes, and the brazing filler metal for 3 minutes (the mixture ratio is: 10L of nitric acid solution with a concentration of 61%, and 0.3L of hydrofluoric acid solution with a concentration of 50%). Finally, the surface of the aluminum base material is cleaned with alcohol and dried quickly, and then a layer of fluoride flux K is applied to the surface of the base material 3 AlF 6 -K 3 AlF 4 , Fix the copper-plated steel stud on the surface of the aluminum base material...

Embodiment 3

[0033] Combine figure 1 with figure 2 Take 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 brazing filler metal before welding. The specific cleaning process is: etch the surface of the aluminum base metal with 11% NaOH solution for 12 minutes, the brazing filler metal for 6 minutes, and the solution temperature is 60 ℃. The mixed solution of nitric acid and hydrofluoric acid etches the surface of the aluminum base metal for 7 minutes, and the brazing material for 4 minutes (the ratio of the mixed solution is: 10L nitric acid solution with a concentration of 64%, and 0.3L hydrofluoric acid solution with a concentration of 55%). After cleaning, blow After drying, apply a layer of fluoride flux K on the surface of the base material 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 ring match...

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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 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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