Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Aluminum steel dissimilar metal laser welding-brazing welding method and filled powder

A technology of dissimilar metals and welding methods, used in laser welding equipment, welding media, welding equipment and other directions, can solve the problems of difficult to form welded joints, reduced mechanical properties of welded joints, poor welding seam forming, etc., to improve the absorption rate and Laser welding speed, good weld formation, effect of increasing spread width

Inactive Publication Date: 2012-11-07
LANZHOU UNIVERSITY OF TECHNOLOGY
View PDF9 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When welding dissimilar metals of aluminum and steel, due to the great difference in physical and chemical properties of aluminum and steel, it is difficult to form an effective welded joint; and the surface of the aluminum alloy is easily oxidized, and the reflectivity to the laser is high, resulting in the absorption of the laser by the aluminum alloy The rate is very low, and the oxide is difficult to melt to form inclusions, pores and other defects; because the molten liquid aluminum has poor wettability on the steel side, it is difficult to wet and spread on the steel side, resulting in unstable welding process and poor weld formation; Al and Fe are easy to form brittle and hard intermetallic compounds, and too thick intermetallic compound layer will reduce the mechanical properties of welded joints
The Chinese patent (Application No. 201110240318.3) entitled "A Flux-Free Laser Powder Filling Welding Method for Aluminum-Steel Dissimilar Metal Joints" discloses a solution, which uses a layer of powder between the aluminum plate and the steel plate and adopts synchronous feeding Powder technology, although this method improves the absorption rate of the laser, the laser absorption rate is limited due to the divergence of the powder during powder feeding and the reflection still existing on the aluminum alloy surface, and the energy density of the laser beam is not concentrated after defocusing or shaping. The matching accuracy between the size of the powder beam and the size of the laser spot is high, and it is difficult to effectively remove the remaining unmelted powder in the interlayer after powder filling welding

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Aluminum steel dissimilar metal laser welding-brazing welding method and filled powder
  • Aluminum steel dissimilar metal laser welding-brazing welding method and filled powder
  • Aluminum steel dissimilar metal laser welding-brazing welding method and filled powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 5052, 5056, 6063 aluminum alloys and galvanized steel ST04Z were used for lap joint tests. The specifications of 5052, 5056, 6063 aluminum alloys and galvanized steel ST04Z were all 150mm×60mm×1mm. When the laser power is 1.5~2.5KW, the welding speed is 0.4~1.2m / min, the defocus is -2~+2mm, and the argon gas protection is 15L / min, the welding seam with beautiful shape and excellent performance can be obtained. The maximum mechanical resistance is 208Mpa, which is about 95% of the base metal.

[0021] Such as figure 1 As shown, the aluminum plate is on the upper steel plate, and the lap length is 4-6mm. The laser beam 1 is vertically injected into the aluminum side, 0-0.5mm away from the edge of the aluminum side, and the angle between the shielding gas nozzle 2 and the beam is 30°-60°. Powder 4 is suitable for covering the surface gloss of the aluminum alloy, and the coating width is 2-4mm.

[0022] figure 2 It is the topography of 5052 aluminum alloy and steel l...

Embodiment 2

[0024] Use 5052 aluminum alloy and galvanized steel plate ST04Z for laser butt fusion brazing, the specification of 5052 aluminum alloy is 125mm×50mm×2mm, the specification of galvanized steel plate ST04Z is 125mm×50mm×1mm, the laser power is 1.7~3.0KW, and the welding speed is 0.4~1.2 m / min, defocus -2~+2mm, and argon protection of 15L / min, it can realize aluminum-steel dissimilar metal butt welding joints. Such as Figure 12 Shown is a schematic diagram of the method of powder coating and laser melting and brazing of aluminum alloys and steels with different thicknesses (thick aluminum and thin steel), such as Figure 12 As shown, the bottom surface of the aluminum plate and the bottom surface of the steel plate are assembled on the same plane without leaving a gap, the laser beam 1 is vertically injected into the aluminum side, and the distance from the edge of the aluminum side is 0-0.5mm, the angle between the protective gas nozzle 2 and the beam is 30°-60°, and the powde...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an aluminum steel dissimilar metal laser welding-brazing welding method and filled powder. A preset powder filling method is adopted. The method comprises the following steps of: configuring a joint to be in overlap joint and butting of different thicknesses, wherein the overlap joint length is 4-10mm in overlap joint; in butting, assembling the aluminum steel with the clearance-free bottom surface on the same level; striking a laser spot on an aluminum alloy in overlap joint and butting, wherein the distance from the laser spot to the edge of an aluminum plate is 0-0.5mm; coating powder so as to cover the gloss on the surface of the aluminum alloy, wherein the coating width is 2-4mm; and protecting by adopting an inert gas, wherein the protection mode is as follows: frontage protection is adopted for overlap joint, and simultaneous protection of frontage and back surface is adopted for butting. When optimized welding technology parameters are adopted, the aluminum alloy is melted and steel is not melted, thereby forming welding-brazing welding overlap joint and butting connection.

Description

technical field [0001] The invention relates to laser melting and brazing technology of dissimilar metals. Background technique [0002] When welding dissimilar metals of aluminum and steel, due to the great difference in physical and chemical properties of aluminum and steel, it is difficult to form an effective welded joint; and the surface of the aluminum alloy is easily oxidized, and the reflectivity to the laser is high, resulting in the absorption of the laser by the aluminum alloy The rate is very low, and the oxide is difficult to melt to form inclusions, pores and other defects; because the molten liquid aluminum has poor wettability on the steel side, it is difficult to wet and spread on the steel side, resulting in unstable welding process and poor weld formation; Al and Fe are easy to form brittle and hard intermetallic compounds, and too thick intermetallic compound layer will reduce the mechanical properties of welded joints. The Chinese patent (Application No...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B23K26/26B23K26/32B23K26/42B23K35/28B23K103/20B23K1/005
Inventor 樊丁蒋锴余淑荣黄健康
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products