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JWJ > Volume 33(5); 2015 > Article
Journal of Welding and Joining 2015 October;33(5) :1-8.
Published online October 30, 2015.
doi:https://doi.org/10.5781/JWJ.2015.33.5.1
Influence of Various Additional Elements in Al Based Filler Alloys for Automotive and Brazing Industry
Ashutosh Sharma*, Y.S. Shin**, Jae-Pil Jung*
*Dept. of Materials Science and Engineering, University of Seoul, Seoul 130-743, Korea
**S K Brazing Co., Gyeonggi 14946, Korea
Correspondence: Jae-Pil Jung  Email: jpjung@uos.ac.kr
  Published online October 30, 2015
ABSTRACT
Aluminium and its alloys are widely used in brazing various components in automotive industries due to their properties like lightweight, excellent ductility, malleability and formability, high oxidation and corrosion resistance, and high electrical and thermal conductivity. However, high machinability and strength of aluminium alloys are a serious concern during casting operations. The generation of porosity caused by dissolved gases and modifiers affects seriously the strength and quality of cast product. Brazing of Al and its alloys requires careful monitoring of temperature since theses alloys are brazed at around the melting temperature in most of the aluminium alloys. Therefore, the development of low temperature brazing filler alloys as well as superior strength Al alloys for various engineering applications is always in demand. In various heat exchangers and automotive applications, poor strength of Al alloys is due to the inherent porosities and casting defects. The unstable mechanical properties is therefore needed to be controlled by adding various additive elements in the aluminium and its alloys, by a change in the heat treatment procedure or by modifying the microstructure. In this regard, this article reports the effect of various elements added in aluminium alloys to improve microstructure, brazeability, machinability, castability as well as to stabilize the mechanical properties.
Keywords: Al alloy | Brazing | Microstructure | Strength | Automotive | Temperature
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