3xxx is alloyed with a different element and is referred to as a 3000 series aluminum alloy. So 1xxx is part of the 1000-series aluminum. The first digit is used to find the other metal in the alloy.
Aluminum alloys are numbered in such a way that you can tell which metal they are alloyed with and either their modification or purity.
The ability to solder to aluminum will depend IMMENSELY on what alloy is used. Superior Flux Aluminum soldering formulations are water-soluble and we have a specialty cleaner, our Aluminum Cleaner (link) for the parts as well when extra post-solder cleaning help is needed. Aluminum soldering flux MUST be cleaned off after use. To date, there is no such thing as a no-clean flux for soldering Aluminum. If you are switching from copper to aluminum, you may need to add stronger ventilation, or use more robust masks to help deal with these more noxious fumes. This is because the flux needs to be strong enough to cut through the tenacious oxide layer that forms on Aluminum and to keep this oxide layer from reforming until the soldering is completed. When the flux is heated it fumes greatly and smells like ammonia. Operators will notice differences in using an Aluminum soldering flux immediately. With his help, here are some very important things when you want to solder to aluminum. A soldering industry veteran, he leads the charge in developing new flux and solder paste products for soldering Aluminum. Superior Flux has the honor of having our very own Aluminum soldering guru in our midst, Mr. But to succeed in soldering Aluminum, it’s all in the details. You need to choose the right filler metal and right flux, clean the Aluminum to remove oxides from your solder area, heat the parts, and clean the joint after soldering. Sure, if you look at the basic steps, it’s the same thing. Soldering to Aluminum is even harder than soldering to Stainless Steel. Soldering aluminum is not like soldering copper, which is generally easy.
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