Joint evolution and strengthening mechanisms in arc brazed galvanised steels with Cu 97 Si 3 filler

Abstract

Galvanised steel sheets have been joined using an arc brazing processing technique with Cu₉₇Si₃ as the filler metal. Gas metal arc (GMA) brazing and gas tungsten arc (GTA) brazing tests were conducted in flowing argon and with varying process parameters. Excellent wetting between base material and filler was observed in all samples. Tensile specimens fractured at the base material in samples prepared using optimal brazing parameters. Microhardness tests performed on the cross-sections of joined samples indicated that joint zone hardness is higher than base material or copper filler. Examination using energy dispersive X-ray analysis revealed the presence of intermetallic compound Fe₅Si₃(Cu) in the joint as well as a small amount of copper inside the base material. The dispersal of fine Fe₅Si₃(Cu) particles in the joint is the main strengthening factor. The Fe₅Si₃(Cu) particles were determined to arise from three sorces: whiskerlike fragmentation, dissolve-separation, and anode spot action.

Keywords

GALVANISED STEELS ARC BRAZING BRAZED JOINTS MECHANICAL PROPERTIES

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References

FUJII

and SHIRAKI

: National Technical Report, 1997, 23, (2), 23–31.

Z. S.

and QIAN

Y. Y.

: Mater. Scl Technol, 2002, 9, 1045-1048.

FRINGS

and STOCKEL

: Schweien Schneiden, 1989, 41, 577–583.

FRINGS

and STOCKEL

: Schweien Schneiden, 1986, 38, 624–629.

JOSEPH

, WEBB

and HARAMIA

: Weld. J, 2001, 12, 36–40.

BOUAIFI

, AIT-MEKIDECHE

and RADSCHEIT

: Int. ‘Brazing and soldering’ Conf. Proc., Albuquerque, NM, April 2000, AWS/ASM International 153–161.

LANCASTER

J. F.

: ‘The physics of welding’, 2nd edn, 8; 1986, Pergamon Press.

J. H.

and LIN

R.Y.

: Metall Mater. Trans. B, 2001, 32B, 1177–1183.

ELDER

K. R.

, GRANT

and GUO

: Phys. Rev. B,1993, 50, 14110–14124.