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Fluxing agent for dry application

A dry coating, aluminum alloy technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of strict parameters

Inactive Publication Date: 2004-12-01
SOLVAY FLUOR & DERIVATE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But other method parameters are strict: the concentration of the flux suspension must be controlled, the heat exchanger must be dried before heating, and the same circulating flux suspension may accept impurities

Method used

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  • Fluxing agent for dry application
  • Fluxing agent for dry application
  • Fluxing agent for dry application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] Determination of volume distribution:

[0026] System: Sympatec HELOS

[0027] Manufacturer: Sympatec GmbH, System-Particle Technology

[0028] structure:

[0029] A measuring instrument for measuring the particle size distribution of solids using laser diffraction.

[0030] This instrument includes the following components:

[0031] Laser light source with radiation forming device, measurement area, where the particles to be measured interact with the laser light, imaging lens system, where the angular distribution of the diffracted laser light is converted into a position distribution on the photodetector, with autofocus unit and rear A multi-element photodetector with integrated electronics digitizes the measured intensity distribution.

[0032] The calculation of particle size distribution is done with the help of WINDOX software. Its principle is based on the intensity distribution using a measured diffraction model (n. Fraunhofer). In the present case HRLD...

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Abstract

A flux based on alkali fluoroaluminate is described which is highly suitable for dry application (''dry fluxing''). This is a flux which is free of fine-grained fraction, which is defined by a range of grain-size distribution.

Description

technical field [0001] The invention relates to a dry coatable flux and its use as flux. Background technique [0002] It has been known for many years to weld aluminum or aluminum alloy components, in particular heat exchangers for the automotive industry, to one another by using fluxes based on alkali metal fluoroaluminates. Among them, the flux is usually sprayed onto the heat exchanger in the form of an aqueous suspension. A stable, non-corrosive connection is produced when the component is heated above the melting point of the solder in the presence of solder or a solder-forming precursor, such as silicon powder or potassium fluorosilicate. Although DE-OS 19749042 has disclosed a method for recycling the waste water produced in the process. But other process parameters are strict: the concentration of the flux suspension must be controlled, the heat exchanger must be dried before heating, and the same circulating flux suspension may accept impurities. These disadvant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/19B23K1/00B23K1/20B23K3/00B23K35/02B23K35/36B23K35/363
CPCB23K35/3605B23K35/0244
Inventor H-W·斯维德斯基A·奥特曼H-J·贝尔特
Owner SOLVAY FLUOR & DERIVATE GMBH