Optimisation of Nocolok(TM) Brazing Conditions for Higher Strength Brazing Sheet

Bolingbroke, R.K.; Gray, Annette; Lauzon, D. C.

doi:10.4271/971861

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…For this reason, the second selected amorphous brazing alloy as a joining material used was with a lower Mg content, to avoid the higher amount of oxide formation while the addition of Si and Ti maintains the strength properties of the joint. In fact, the solid-state diffusion is a time-temperature dependent phenomenon and it becomes more rapid at a temperature above 425 • C when Mg diffuses very quickly and forms oxides at higher melting temperature [29] at early stages of the brazing process. Orman et al [30] reported that Mg favours the formations of oxides and suggested that oxide free joint can be achieved if Mg content is restricted to or below 0.3% along with the use of standard brazing flux.…”

Section: Al-alloy Sheet/al-alloy Foam Joint Microstructure Analysismentioning

confidence: 99%

Joining of Aluminium Alloy Sheets to Aluminium Alloy Foam Using Metal Glasses

Bangash

Ubertalli

Saverio

et al. 2018

Metals

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Aluminium alloy foam is a lightweight material with high energy absorption properties and can potentially replace bulk Al-components. The aim of this work is to develop a brazing technique to join aluminium facing sheets to aluminium alloy foam to obtain aluminium foam sandwich panels for applications where high service temperature is a requirement. Al-6016 alloy sheets were brazed to aluminium alloy foam using two aluminium based (Al-Cu-Mg and Al-Si-Mg-Ti) metal glasses at 560 • C-590 • C in an argon atmosphere. Microstructure and microhardness profiles of the aluminium alloy sheet/aluminium alloy foam brazed joints were analysed using a microhardness tester and scanning electron microscope equipped with electron dispersion spectroscopy. A three-point bending test was conducted to study the flexural behaviour of the aluminium foam sandwich composite panels.

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Section: Al-alloy Sheet/al-alloy Foam Joint Microstructure Analysismentioning

confidence: 99%

Joining of Aluminium Alloy Sheets to Aluminium Alloy Foam Using Metal Glasses

Bangash

Ubertalli

Saverio

et al. 2018

Metals

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“…To illustrate the effects of Mg on the brazing process, Bolingbroke et al [4] chose the angle-on-coupon method. In this technique, an aluminium angle is laid on top of a cladded aluminium coupon where the legs of the angle are raised using stainless steel wire (see Fig.…”

Section: Effects Of Mg On the Brazing Processmentioning

confidence: 99%

Vacuum High-Temperature Brazing of 3003 Aluminum Alloy

Maksymova,

Voronov,

Kovalchuk

et al. 2023

JES

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Brazing filler metals based on the Al-Si system are widely used for brazing aluminum alloys. Their melting point is 577 °С (eutectic). It is necessary to conduct comprehensive studies of the technological properties of experimental filler metals and brazed joints to create a brazing filler metal with a reduced melting temperature for vacuum brazing of thin-walled aluminum products made of alloy 3003. The paper presents the research results on high-temperature vacuum brazing of aluminum alloy 3003 with Al-Cu-(Si, Mg) filler metal. It was determined that the amount of magnesium in the filler should be limited due to the risk of porosity formation associated with magnesium vaporization. It was identified that reducing the magnesium content increases the liquidus temperature above 530–550 °C. Therefore, experimental alloys require additional alloying with depressant elements, particularly silicon, to achieve the required melting temperature level. The chemical inhomogeneity of the filler in the initial state (after rapid solidification from the liquid state) and the structure of the brazed joints were investigated using micro-X-ray spectral analysis. Through empirical means, it was determined that a magnesium content of 1.5 % by weight in the filler allows for producing high-quality brazed joints without visible defects. In this case, shear strength is in the range of 0.6–0.7 of the strength of the base material. Tests of brazed joints for three-point bending resulted in an angle close to 180°, which indicates the promising use of experimental brazing filler metal in vacuum brazing of aluminum alloy 3003.

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“…It is a very attractive process since it can be operated continuously at low costs [Fortin, 1985]. Although the CAB process is very popular it has some constraints like, the flux can not tolerate high magnesium alloys [Bollingbroke, 1997] and the uniform application of the flux on the heat exchanger to be brazed can be very difficult to control.…”

Section: Aluminium Alloys For Brazing Sheet Applicationsmentioning

confidence: 99%