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Compatibility of filler and base metals in heat exchanger manufacturing process.

Number: pap. 2551

Author(s) : ZHAO H., ELBEL S., HRNJAK P.

Summary

Aluminum is one of the most commonly used metals for manufacturing heat exchangers. Mass production of compact aluminum heat exchangers can be achieved by furnace or flame brazing with the assistance of fluxes. It is well known that a brazing process relies on good wetting of liquid filler metal on the base surfaces of various heat exchanger components. Proper selection of heater exchanger materials is essential for the success of a brazing process. The cladded brazing sheet has been widely used in the aluminum heat exchanger manufacturing process. Due to the phase changes of the cladded layer during brazing, the surface properties of the heat exchanger components may be altered during the brazing process. In this study, selected cladded brazing sheets are used for testing under controlled atmosphere brazing (CAB) conditions. During the manufacturing or installation processes of the aluminum heat exchangers, there is often the need to repair small defects on the heat exchangers. The Zn-Al filler metal has been considered a good candidate for brazing of aluminum at relatively low temperatures. Wetting behaviors of selected Zn-Al filler metal on the post-brazing surface of the cladded sheet is investigated. It was found that the phase change of clad material leads to apparent change of the surface morphology. The preliminary wetting tests show that the ZnAl filler metal can wet the post-brazing claded sheet at a relatively low brazing temperature (500 °C) without remelting the Al-Si clad layer. Therefore, ZnAl may be considered as a candidate for the rebraze/repair of aluminum heat exchangers.

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Pages: 9

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Details

  • Original title: Compatibility of filler and base metals in heat exchanger manufacturing process.
  • Record ID : 30024643
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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