Volume 6, Issue 1 (Journal OF Welding Science and Technology 2020)                   JWSTI 2020, 6(1): 19-32 | Back to browse issues page

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Hashemi Milani S A A, Tavangar R, Azadbeh M, Kahinpoor, Sadeghi-Nasab H. Effect of NOCOLOK® flux dry-off temperature on brazed joint strength of aluminum-based heat exchangers. JWSTI 2020; 6 (1) :19-32
URL: http://jwsti.iut.ac.ir/article-1-293-en.html
Abstract:   (2313 Views)
During the brazing of aluminum-based heat exchangers, the flux dry-off temperature plays a crucial role to get sound joints with maximum strength. In the present study, the NOCOLOK® flux consists of two phases of K2AlF5.H2O and KAlF4 with a melting point around 580 °C was used for brazing AA3003 as base metal with a clad-coating of AA4343 as filler metal. The slurry was applied on the joints and they dried at 220, 300 and 380 °C in air. The tensile shear test revealed that when the slurry dried at 300 °C, the joint withstand maximum shear stress of 44 MPa without defective features. At 220 °C and 380 °C, joint shear stresses were 34 MPa, 30 MPa respectively. However, drying at 380 °C under protective nitrogen gas enhanced the shear strength of up to 39 MPa. Having applied a change in current dryer temperature in the factory from 360 °C to 300 °C reduced the percentage of heat exchangers leakage from 3.2% to 0.6%, approximately, on a weekly basis.
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