MEASUREMENT METHOD FOR DETERMINING THE RESIDUAL FLUX DEPOSITS IN A HEAT EXCHANGER FROM A CONTROLLED ATMOSPHERE BRAZING LINE

Grigore  COCIAN; Cătălin  POPA

Authors

Grigore COCIAN RAAL S.A., Bistrița, Romania. Corresponding author: productie@raal.ro.
Cătălin POPA Department for Materials Science and Engineering, Technical University, Cluj-Napoca, Romania. Email: catalin.popa@stm.utcluj.ro. https://orcid.org/0000-0003-4188-1169

Keywords:

brazing technology, heat exchanger, residual flux, Nocolok, experimental, method

Abstract

The brazing technology of aluminum alloys having the highest efficiency, used at manufacturing heat exchangers, is the controlled atmosphere brazing with the NOCOLOK flux. The major inconvenience of the process is the residual flux retained on the internal surfaces of the heat exchanger, which in certain quantities may react with the cooling agents leading to gels that may compromise the functionality of the heat exchangers. The present paper presents a method of measuring the residual flux quantity based on the repeated experimentation and measurements taken on the horizontal, and vertical brazing manufacturing lines.

References

RAAL (2014,December,15), Product Catalog [Online]. Available: http://www.raal.ro/products.htm

Cocian Grigore, Popa Cătălin, Experimental Studies Regarding Binder's influence on aluminium alloys controlled atmosphere brazing, International Conference on Production Research, Cluj-Napoca, 2014.

C. Kammer, „Aluminium Handbook”, Aluminium-Verlag, 1999. Vol 1 Fundamentals and materials

L. Orman și H. Swidersky, Selective pre-fluxing with adhesives, SOLVAY Congress, Aluminum Brazing, Dusseldorf, 2012.

Water quality - Digestion for the determination of selected elements in water -- Part 2: Nitric acid digestion, ISO 15587-2, 2003.

Water quality - Determination of selected elements by inductively coupled plasma optical emission spectrometry (ICP-OES), ISO 11885, 2007.

Water quality –Determination of electrical conductivity, SR EN 27888, 1997.

M.A. Mueller, G.R. Schade, S.A. Hooks, R.L. Beck, G.F. Clyde, T.W. Dekleva, D. Inthout „Standard Engineering Analysis of Experimental data,” ASHARE, 2004.