Aluminum/steel dissimilar material friction-stir lap joint method assisted by rivet type mechanical connection

A mechanical connection and friction stir technology, which is applied in welding equipment, non-electric welding equipment, manufacturing tools, etc., can solve the problems of small bearing area of ​​joints, weakening the bearing capacity of aluminum/steel dissimilar joints, etc., and achieve the effect of reducing wear

Inactive Publication Date: 2016-02-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problem that the connection between the existing aluminum/steel dissimilar metals adopts brazing or fusion welding process, the two are easy to react to form brittle intermetallic compounds, and the joint bearing a

Method used

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  • Aluminum/steel dissimilar material friction-stir lap joint method assisted by rivet type mechanical connection
  • Aluminum/steel dissimilar material friction-stir lap joint method assisted by rivet type mechanical connection
  • Aluminum/steel dissimilar material friction-stir lap joint method assisted by rivet type mechanical connection

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specific Embodiment approach 1

[0017] Specific implementation mode one: combine Figure 1 ~ Figure 3 Describe this implementation mode, this implementation mode is realized through the following steps:

[0018] Step 1. Determine the lap width B of the joint between the steel plate 1 and the aluminum plate 2, determine the longitudinal centerline N-N on the lap width B of the steel plate 1, and drill a row of pre-drilled holes 1-1 along the longitudinal centerline N-N, each pre-drilled The diameter d of the hole 1-1 is 1 mm to 5 mm, the distance between two adjacent pre-drilled holes 1-1 is (d+xd) mm, x is the distance coefficient, and the value of x is 0 to 2;

[0019] Step 2. Clean the contact surface of the steel plate 1 and the aluminum plate 2 and the surrounding area of ​​20 mm to 30 mm, and remove the oxides on the surface of the steel plate 1 and the aluminum plate 2;

[0020] Step 3: Wipe the surfaces of the steel plate 1 and the aluminum plate 2 with an organic solvent or cleaning agent to remove ...

specific Embodiment approach 2

[0022] Specific implementation mode two: combination figure 1 To illustrate this embodiment, in this embodiment, in step 1, the steel plate 1 is ordinary low-carbon steel or low-alloy steel, and the aluminum plate 2 is pure aluminum or aluminum alloy. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Specific implementation mode three: combination figure 2 This embodiment is described. In this embodiment, the diameter d of each pre-drilled hole 1-1 in step 1 is 2.5 mm. Other steps are the same as in the first embodiment.

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Abstract

Provided is an aluminum/steel dissimilar material friction-stir lap joint method assisted by rivet type mechanical connection. The lap join method aims at solving the problems that aluminum/steel dissimilar metals are prone to reaction to generate brittle intermetallic compounds in the existing connection process of brazing or fusion welding, and the bearing area of connectors is small and the bearing capacity of the aluminum/steel dissimilar connectors is weakened in the friction-stir-welding lap joint process. The method comprises the steps that (1) a row of pre-drilled holes are drilled in the lap joint width direction B of a steel plate along the longitudinal central line; (2) contact surfaces and the peripheral areas of the steel plate and an aluminum plate are cleaned up, and oxides on the surface of the steel plate and the surface of the aluminum plate are removed; (3) the surface of the steel plate and the surface of the aluminum plate are wiped with organic solvents or cleaning agents; and (4) the aluminum plate and the steel plate are fixed through a clamp, in the friction stir welding process, a stirring head and the aluminum plate rub, softened aluminum flows downwards, and then the pre-drilled holes in the steel plate are filled, so that a rivet type connecting structure is formed, and an aluminum/steel friction-stir lap joint connector which is strengthened through mechanical connection is obtained. The method is used for friction-stir lap joint of dissimilar materials.

Description

technical field [0001] The invention relates to a mechanical connection assisted friction stir welding method, in particular to a rivet type mechanical connection assisted friction stir welding method for overlapping aluminum / steel dissimilar materials. Background technique [0002] Environmental protection issues are getting more and more attention from all over the world. In the automobile manufacturing industry, lightweight manufacturing of automobiles can reduce energy consumption, reduce harmful gas emissions, and protect the environment. Aluminum and its alloys are light in weight, high in specific strength, corrosion resistant, and have good thermal and electrical conductivity. Therefore, the use of aluminum / steel dissimilar metal composite structures can meet the dual technical requirements of structural performance and lightweight design. In aerospace, transportation, shipbuilding and other industries, in order to reduce weight, save energy, reduce costs, and meet d...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24B23K20/227B23K103/20
CPCB23K20/1265B23K20/2275B23K20/24B23K2103/20
Inventor 黄永宪王继超万龙周利冯吉才
Owner HARBIN INST OF TECH
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