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

Pretreatment method for hard solder on partial surface of magnesite product

A local, brazing technology, applied in the direction of welding medium, welding equipment, metal material coating process, etc., can solve the problems of segregation, deformation of magnesium alloy, and corrosion of magnesium alloy by flux without consideration

Inactive Publication Date: 2009-05-13
何靖
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The properties of magnesium alloy workpieces are extremely sensitive to heat treatment. The reason is that the thermal expansion coefficient of magnesium alloys is 2 to 3 times higher than that of ordinary metals. If the heating is uneven, problems of deformation and internal stress will be left inside the magnesium alloy; It will also leave the problem of segregation and denaturation
Therefore, the traditional heat welding (welding temperature exceeds the melting point of the material) method is not suitable for magnesium alloy workpieces, and it is particularly difficult to weld thin plates.
In terms of thin plates, the best way is to consider cold welding (welding temperature is lower than the melting point of the material) to avoid the aforementioned shortcomings. There are not many previous efforts: Falke, et al. in US Patent 4,613,069, etc., use copper nickel The alloy is electroplated on the surface of the magnesium alloy, and then the magnesium alloy is cold-welded with a tin-lead alloy. This process does not take into account the corrosion of the flux to the magnesium alloy; in US Patent 4,925,084, Persson uses a local explosion method to weld the aluminum-magnesium alloy, and the aluminum alloy that can be used Magnesium alloys are limited to alloys with superplasticity, and are also limited by the shape and cost of the workpiece; Kujas uses stearic acid, palmitic acid, and oleic acid in US Patent 4,739,920 as The main component of flux, this process does not take into account the corrosion of flux to magnesium alloys

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
  • Pretreatment method for hard solder on partial surface of magnesite product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] Magnesium alloy AZ31 plate test piece, thickness 0.4mm, after hot-rolled forming, try to weld copper nut with 3mm outer diameter on it. For example, the process shown in example 1 of patent application No. 095117849 is carried out to the first electroless nickel plating process (the plate test piece at this stage is referred to as test piece A), and it is directly put into the operating conditions without washing with water, as shown in Table 1. The electroless nickel deposition process is carried out in the high-phosphorus electroless nickel plating tank shown (the plate test piece at this stage is referred to as test piece B).

[0012] Table 1: High Phosphorus Electroless Nickel Plating Operating Conditions

[0013]

[0014] Prepare commercial soldering flux (Alpha 100T2) quenched and tempered as shown in Table 2 and mix corresponding tin alloy particles to form solder paste with different components. After reflow shown in Table 2, solder the nut on the magnesium a...

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 relates to a preprocessing method for brazing on the partial surface of magnesium material, wherein, the preprocessing method includes two novel technologies including the magnesium alloy surface upgrading and processing technology without electronickelling and the technology for manufacturing special soldering flux to coordinate with a plurality of leadless tin alloy solders; the welding method adopts the process flow that the medium phosphorus (the content of phosphorus is 3-7 percent ) without electronickelling process is performed on the surface of the magnesium-alloy work piece at first, then the high phosphorus (the content of phosphorus is 7-12 percent) without electronickelling process is performed, and the tin welding process is performed finally.

Description

【Technical field】 [0001] The invention belongs to the technical field of magnesium alloy welding, and in particular relates to a pretreatment method for local surface brazing of magnesium materials. 【Background technique】 [0002] The properties of magnesium alloy workpieces are extremely sensitive to heat treatment. The reason is that the thermal expansion coefficient of magnesium alloys is 2 to 3 times higher than that of ordinary metals. If the heating is uneven, problems of deformation and internal stress will be left inside the magnesium alloy; It will also leave the problem of segregation and denaturation. Therefore, the traditional heat welding (welding temperature exceeds the melting point of the material) method is not suitable for magnesium alloy workpieces, and it is especially difficult to weld thin plates. In terms of thin plates, the best way is to consider cold welding (welding temperature is lower than the melting point of the material) to avoid the aforemen...

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): B23K1/20C23C18/36B23K35/363B23K35/26B23K103/08
Inventor 何靖
Owner 何靖
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More