Molten aluminum equilibrium membrane formed during controlled atmosphere brazing

Sekulić, Dušan P.

doi:10.1016/s0020-7225(00)00022-7

Cited by 22 publications

(7 citation statements)

References 12 publications

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“…5 and 6 compare the experimental results from Fig. 3(b) and (c), respectively, in [5] with our mode! results for 0L = 0.05, 0.07 and 0.09, corresponding to 2.86°, 4.01° and 5.16°, respectively; for these, s = 0.06.…”

Section: Model Summary and Numerical Solutionmentioning

confidence: 55%

“…To validate the model, data parallelling the experimental details given by Sekulic [5] were considered. The core alloy consists of AA3003 alloy which is mainly an Al -Mn alloy with 1.…”

Section: Model Summary and Numerical Solutionmentioning

confidence: 99%

“…To calculate ho, we use Fig. 3(b) and (c) from [5], which indicate the cross-sectional area of the joint to be 7.060x 10-7 m 2 and 6.423x 10-7 m 2 ; using these and the value of wo given above leads to ho = 3.53 x 10-3 m and 3.21 x 10-3 m, respectively. As for 0L, this is a quantity that does not explicitly appear at ail in [5], where it is argued that the fact that a good brazed joint indicates a very small inclination angle of the joint surface close to the mating surfaces implies that an assumption of a close-to-zero contact angle between the molten metal and the solid substrate at the onset of solidification is plausible indeed.…”

Section: Model Summary and Numerical Solutionmentioning

confidence: 99%

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On the modelling of joint formation in dissolutive brazing processes

Vynnycky

Lacaze

2019

J Eng Math

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In this paper, earlier dissolutive wetting models describing the dynamics of an axisymmetric alloy drop spreading on pure metal substrate are extended to describe reactive wetting and subsequent joint formation in brazing processes. A two-dimensional time-dependent problem is formulated, and the model equations are nondimensionalized, revealing the possibilities for asymptotic mode! reduction. Whilst the numerical solution of the time-dependent problem, which contains two moving contact lines and would not in general be amenable to lubrication theory, is relegated to future work, the steady-state problem is analyzed in detail. The analysis offers an arguably more transparent alternative to an earlier energy minimization approach for finding the location of the meniscus, which ultimately constitutes the joint. The results of the present mode! are found to compare favourably to those of earlier experimental and theoretical work.

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Section: Model Summary and Numerical Solutionmentioning

confidence: 55%

“…To validate the model, data parallelling the experimental details given by Sekulic [5] were considered. The core alloy consists of AA3003 alloy which is mainly an Al -Mn alloy with 1.…”

Section: Model Summary and Numerical Solutionmentioning

confidence: 99%

Section: Model Summary and Numerical Solutionmentioning

confidence: 99%

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On the modelling of joint formation in dissolutive brazing processes

Vynnycky

Lacaze

2019

J Eng Math

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“…To increase the wettability of the melted filler metal at the surface, fluxing is used to remove the natural oxide layer covering the Al surface [9]. Due to the high temperature and cladding with the flux material [10,11], the geometry and microstructure of the joint region, tube, and fin are modified [12][13][14][15]. The microstructural change can influence the corrosion behavior.…”

Section: Introductionmentioning

confidence: 99%

Simulation Approach for Cathodic Protection Prediction of Aluminum Fin-Tube Heat Exchanger Using Boundary Element Method

Kim

Park

Kim

2019

Metals

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The multi-galvanic effect of an Al fin-tube heat exchanger was evaluated using polarization tests, numerical simulation, and the seawater acetic acid test (SWAAT). Determination of the polarization state using polarization curves was well correlated with numerical simulations using a high-conductivity electrolyte. However, the polarization results did not match those of the low-conductivity electrolyte due to the lower galvanic effect. Although the polarization state is changed by electrolyte conductivity, the total net current of the tube is decreased in the case of the anodic joint. From SWAAT results, the leakage time of Al fin-tube heat exchanger assembled by anodic joint was longer than the case with cathodic joint.

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“…The brazing sheets are two or multi-layered composites of at least two distinct aluminum alloys. In these kinds of sheets, the aluminum brazing filler alloys (Al-4XXX series) are clad to the aluminumbase alloys (generally Al-3XXX series) by cold or hot rolling [1,3,[5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Roll bonding behaviour of Al-3003/Al-4043 and Al-3003/Zn sheets

et al. 2011

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In the present study, the roll bonding behaviour of Al-3003/Al-4043 and Al-3003/Zn sheets were compared. The bi-layer sheets were produced by a roll bonding process at different reductions in thickness and rolling temperatures. The joint strengths of the sheets were evaluated by peel and bend testing before and after supplemental annealing treatment. The peeled surfaces were examined using a scanning electron microscope. The results indicated that the Al-3003/Al-4043 sheets were bonded with higher joint strength and lower threshold reductions in thickness with respect to the Al-3003/Zn sheets. In contrast to the Al-3003/Zn sheets, significant improvement was observed in the joint strength of the Al-3003/Al-4043 sheets after annealing treatment. Moreover, electron microscopy examinations showed that the fracture types of the Al-3003/Al-4043 and Al-3003/Zn sheets were predominantly ductile and brittle, respectively.

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Molten aluminum equilibrium membrane formed during controlled atmosphere brazing

Cited by 22 publications

References 12 publications

On the modelling of joint formation in dissolutive brazing processes

On the modelling of joint formation in dissolutive brazing processes

Simulation Approach for Cathodic Protection Prediction of Aluminum Fin-Tube Heat Exchanger Using Boundary Element Method

Roll bonding behaviour of Al-3003/Al-4043 and Al-3003/Zn sheets

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