The aluminium brazing paste is crucial during the brazing process. It aids in sealing the metals together, making the joint stronger and less likely to crack. Additionally, it serves to keep the metal from corroding. Additionally, it fills in dents and cracks in the metal. This is crucial when joining devices made of aluminum.
Fluorine-type fluxes of various varieties have been suggested for aluminum brazing paste. The best fluxes for spraying are those of the fluorine type. Fluorine is a crucial component of aluminum brazing fluxes. Since fluorine dissolves the oxide film that builds up on aluminum surfaces, it is used in the brazing process. Fluorine also prevents the filler metal from flowing freely.
Fluorine-type fluxes are superior to chloride-type fluxes in a number of ways. Fluorine-type fluxes, for instance, have higher melting points. They are less prone to degradation because of the higher melting point. The ability to blend with the filler metal and paste vehicles is a benefit of fluorine-type fluxes. A variety of different ingredients can be used to create fluxes of the fluorine type.
Potassium fluoroaluminate is the main component of fluxes of the fluorine type. 60 to 50 weight percent aluminum fluoride and 40 to 50 weight percent potassium fluoride make up potassium fluoroaluminate. It is also possible to use fluxes of the fluorine type made from other fluorides.
AlF3-KF or KAlF4-K3AlF6 can also be used to create fluxes of the fluorine type. These fluxes can be used to braze materials made of aluminum that contain a lot of magnesium. They work well for air brazing as well. However, there shouldn't be an excessive amount of a-alumina in the flux. A-alumina tends to make aluminum more brittle when added in large quantities.
Choosing the best brazing paste can be difficult, especially in light of the many options available. This quick guide will help you choose the best flux for your application if you're looking for a new one or simply want to brush up on your knowledge. It includes some surprisingly helpful tips as well as a brief summary of some of the more well-liked choices.
The best brazing pastes typically have a lower melting point than their metal counterparts and are water-based. The best brazing pastes also have high dispensing rates, which are ideal for the precise dispensing required to produce the kind of high-quality brazed joints you desire.
High temperatures shouldn't cause a good brazing paste to melt off, but performance will vary depending on the application. It is a good idea to use a brazing paste that can withstand high temperatures, especially if you are working with aluminum and aluminum alloys.
The filler metal receives flux application during brazing aluminum. The surface oxide film that develops on the filler metal is removed by this flux. Additionally, the flux absorbs the oxides that develop during heating. The air is then replaced by the flux, which makes it simpler to wet the base metal solder. Additionally, it aids in the metals' stronger bonding together.
The color of the finished solder joint can also be impacted by the fluxes used in aluminum brazing. In general, a balance of properties is considered when choosing the flux composition. The flux must also be low in viscosity and low in corrosion.
Aluminum brazing flux is offered as a paste or in powder form. They are used by dipping or spraying. To get rid of tough flux residue if the part is not submerged, brush it.
Fluorides and chlorides typically make up fluxes. Other chemicals may also be present in fluxes. For instance, some fluxes include both cryolite and aluminum fluoride.
Changsha Tianjiu Metal Materials Co., Ltd., hereby called TIJO, initiated the research into "spherical material powder" in 2007, and the company was established in 2010. It has fifteen years experience in metal materials R&D and production and has a strong technical background.
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