Researches and Studies regarding Brazed Aluminium Alloys Microstructure Used in Aeronautic Industry

A Dimitrescu, D. F. Niţoi, Z. Apostolescu, Engineering and Tehnological Systems Management Faculty, Polytehnic University of Bucharest, Romania, D. Dobrotă, Engineering Faculty, University “Constantin Brâncuşi” of Târgu-Jiu, Romania Brazing is applied to the merge of the pieces which are most required, tensile strength of the solder can reach high values. By brazing there can be assembled pieces of most metals and ferrous and nonferrous alloys, with high melting temperature. This paper presents an analysis of the microstructure of materials from a brazed merge of aluminum alloy L103 which is often used to produce pieces of aeronautical industry. Brazing material was performed using several technologies, and after examination of the microstructure of materials from the merge area it was established as optimal technology the technology which consist of pickling in Aloclene 100 solution with the deposition of filler material on both sides of the base material and the use of spectral acetylene and neutral flame.