Stirring head for friction stir welding of large gap thin sheet aluminum alloy and welding technology of stirring head

A technology of friction stir welding and welding process, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of inconsistent fit gaps of battery boxes and prone to defects, etc., to reduce assembly accuracy requirements, promote metal flow, Effect of increasing weld width

Active Publication Date: 2019-04-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that defects are easily generated in the friction stir welding process due to the inconsistency of the fitting gap caused by the precision problem in the assembly process of the battery box of the new energy vehicle, and provides a kind of stirring machine for friction stir welding of aluminum alloy with large gap. Head and its welding process

Method used

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  • Stirring head for friction stir welding of large gap thin sheet aluminum alloy and welding technology of stirring head
  • Stirring head for friction stir welding of large gap thin sheet aluminum alloy and welding technology of stirring head
  • Stirring head for friction stir welding of large gap thin sheet aluminum alloy and welding technology of stirring head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The thickness of the plate is 2.5mm, the distance between the shoulders of the stirring head is 10mm, the diameter of the stirring needle is 8mm, the ratio of the diameter of the stirring needle to the diameter of the shoulder is 0.8, the length of the stirring needle is 2.3mm, and the shoulder of the stirring head is selected. There are 3 counterclockwise vortex patterns, and 2 spiral grooves are arranged on the stirring needle.

[0042] The specific steps are as follows:

[0043] Step 1: Clean the 2.5mm thick aluminum alloy with alcohol on the surface of the metal plate and the oil stains and oxides on the interface interface that hinder the welding process, place the cleaned plate on the workbench, and pass the pressure plate and other tooling. Fix the plate on the workbench, and select a stirring head with a stirring needle length of 2.3mm according to the thickness of the plate to be welded.

[0044]Step 2: Move the stirring head to the starting position of the we...

Embodiment 2

[0048] The thickness of the selected plate and the size of the stirring needle are the same as those in Example 1.

[0049] The specific implementation steps are as follows:

[0050] Step 1: Clean the 2.5mm thick aluminum alloy with alcohol on the surface of the metal plate and the oil stains and oxides on the interface interface that hinder the welding process, place the cleaned plate on the workbench, and pass the pressure plate and other tooling. Fix the plate on the workbench, and select a stirring head with a stirring needle length of 2.3mm according to the thickness of the plate to be welded.

[0051] Step 2: Move the stirring head to the starting position of the welding seam, adjust the position of the stirring head so that the center of the stirring needle coincides with the center line of the welding seam, and stop when the stirring head moves downward until the end face of the stirring needle contacts the surface of the workpiece.

[0052] Step 3: Set the welding pa...

Embodiment 3

[0055] The thickness of the selected plate and the size of the stirring needle are the same as those in Example 1.

[0056] The specific implementation steps are as follows:

[0057] Step 1: Clean the 2.5mm thick aluminum alloy with alcohol on the surface of the metal plate and the oil stains and oxides on the interface interface that hinder the welding process, place the cleaned plate on the workbench, and pass the pressure plate and other tooling. Fix the plate on the workbench, and select a stirring head with a stirring needle length of 2.3mm according to the thickness of the plate to be welded.

[0058] Step 2: Move the stirring head to the starting position of the welding seam, adjust the position of the stirring head so that the center of the stirring needle coincides with the center line of the welding seam, and stop when the stirring head moves downward until the end face of the stirring needle contacts the surface of the workpiece.

[0059] Step 3: Set the welding pa...

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Abstract

The invention relates to the field of thin sheet aluminum alloy welding of a new energy automobile battery box, in particular to a stirring head for friction stir welding of a large gap thin sheet aluminum alloy and a welding technology of the stirring head. The stirring head gathers extruded metal from a shaft shoulder to the shaft shoulder center through shaft shoulder scroll patterns, the gathered metal is conveyed into a gap through spiral grooves in a stirring needle and in cooperation with corresponding technological parameters, and meanwhile, the total metal flow in a weld joint is increased and reduced through the arrangement of large diameter stirring needle to reduce the proportion of the gap in the weld joint, and welding of the large gap thin sheet aluminum alloy is realized finally.

Description

technical field [0001] The invention relates to the field of aluminum alloy welding of thin plates of battery boxes of new energy vehicles, in particular to a stirring head for friction stir welding of aluminum alloys of thin plates with large gaps and a welding process thereof. Background technique [0002] According to the principle of automobile engineering, the influence of the weight of the car body on the power consumption is considered. At present, the battery boxes of new energy vehicles are mainly made of aluminum alloys. After comprehensively considering various factors such as box structure, welding process, and post-weld deformation, friction stir welding was determined as the main welding method for the bottom plate of the box. Due to the influence of the machining accuracy of the bottom plate and the bending process of the frame, in the assembly process of the bottom plate and the frame, the matching gap between the bottom plate and the frame is often inconsis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/12B23K20/1255B23K20/24
Inventor 周琦孙宏宇时孝东孙智鸣王克鸿周明马新蕊
Owner NANJING UNIV OF SCI & TECH
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