ESAB OK AlSi12 is a covered electrode suitable for welding of aluminum castings of AlSi-, AlSiMg- and AlSiCu-types. Also possible to use as filler material in gas welding.
The alloy works very well for the welding of cast aluminum parts, and it can also be used as a brazing alloy if the appropriate flux is used. It is well-known for its low weight in relation to its strength, as well as for the favorable thermal qualities it possesses.
The low tensile strength and nearly zero elongation of the alloy are due to its unaltered phases of microstructure composition. Because of its relatively low melting point and limited freezing range, AlSi12 was first created for use as a brazing alloy. More silicon means more fluidity and less shrinking compared to AlSi5. When used as a filler alloy, AlSi12 greatly decreases the likelihood of hot cracking.
Because of its favorable qualities, the ESAB OK AlSi12 is used in the production of pistons for internal combustion engines. It is great for putting metal pieces together in techniques such as extrusion and casting because it has qualities that make it suitable for welding and brazing. In addition to its widespread application in the domains of aviation, aerospace, racing, and automobile manufacturing, the ESAB OK AlSi12 is also commonly used for applications involving thin walls, such as the production of heat exchangers.
Reference: Aluminum Alloy AlSi12