Rosin fluxes are not satisfactory. Do not use solder if anything soldered come in contact with heat levels that are higher than the melting point of the solder. Pictured: Aluminum stock with a. Area cleansed using a wire brush made out of stainless steel. Once the base material is hot enough the soldering rod melts and flows into the joint.
The most readily soldered aluminum alloys contain no more than 1 percent magnesium or 5 percent silicon. Alloys containing greater amounts of these constituents have poor flux wetting characteristics. High copper and zinc-containing alloys have poor soldering characteristics because of rapid solder penetration and loss of base metal properties.
The joint designs used for soldering aluminum assemblies are similar to those used with other metals. The most commonly used designs are forms of simple lap and T-type joints. Joint clearance varies with the specific soldering method, base alloy composition, solder composition, joint design, and flux composition employed. However, as a guide, joint clearance ranging from 0.
Grease, dirt, and other foreign material must be removed from the surface of aluminum before soldering. In case the aluminum product you have is marked with a letter or number, you should look into the specifications and adhere to it.
Aluminum alloys containing 1 percent magnesium or 5 percent silicon are relatively easier to solder. Alloys which have more amounts of these will have poor flux wetting characteristics. If the alloy has a high percentage of copper and zinc in it, it will have poor soldering characteristics as a result of rapid solder penetration and loss of properties of the base metal.
Soldering aluminum can be difficult compared to other metals. Also, keep in mind that these metal oxide will reform quite quickly once it comes into contact with air, so soldering should be done as soon as possible.
It will take a short while to get your soldering iron to the ideal temperature. I would suggest you keep a damp cloth or sponge by to clean the iron off any excess solder. Use a steel brush to remove the layer of aluminum oxide from the aluminum. After cleaning up the pieces, apply the flux along with the places you want to join.
You can use a metal tool or just the rod of the solder for application. This will stop aluminum oxide for forming as well as draw the iron solder along the long side of the join.
Clamp them in the position you want to join them. Make sure the pieces of aluminum have a slight gap between them when clamping for the iron solder to flow. Heat the parts of the pieces adjacent to the joint with your soldering iron. Applying heat to one area may cause the flux and solder to overheat, so, make sure to keep moving your heat source slowly. That way the area can be heated evenly. Then apply it to the joint. It will take only a few seconds for the solder to dry.
Tinning of the aluminum surface can best be accomplished by covering the material with a molten puddle of solder and then scrubbing the surface with a non-heat absorbing item such as a glass fiber brush, serrated wooden stick, or fiber block. Wire brushes or other metallic substances are not recommended. They tend to leave metallic deposits, absorb heat, and quickly freeze the solder.
Soldering aluminum is notoriously difficult when compared to soldering other metals. This is particularly true when it comes to aluminum alloys. This is because all aluminum is coated in a layer of aluminum oxide, where the metal comes into contact with the atmosphere. Aluminum oxide cannot be soldered, so must be scraped off. Soldering must then be done very quickly, before more aluminum oxide forms.
Heat up your soldering iron. It can take around 10 minutes for it to reach the ideal temperature. You next need to remove the aluminum oxide from the aluminum.
This can be done with a steel brush. Extremely oxidized aluminum may require more intensive sanding, or cleaning off with acetone. Apply the cleaning agent, called the flux, to prevent aluminum oxide from reforming as quickly.
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