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Repair of nickel aluminium bronze (NAB) components using multi-pass welding

Journal Article


Abstract


  • Nickel aluminium bronze (NAB) is basically a dual-phase copper alloy that is commonly used in marine operations in which components are exposed to high stresses and corrosive conditions. NAB contains between 5 wt% -11 wt% aluminium with additions of nickel and iron. A typical alloy composition range is 8-13 wt%Al, 3-5 wt%Ni, 3-5 wt%Fe and 0-3 wt%Mn. With strengths equivalent to medium-grade carbon steeels, this cuprous alloy offers even higher corrosion resistance than most stainless steel materials in seawater. NAB inherits its outstanding corrosion resistance from the formation of a tough adherent film of aluminium oxide (Al203). It is this film that allows NAB to be used extensively in the marine components such as propeller blades, pump impellers and other underwater components. Despite the excellent qualities of NAB, it can still deteriorate during service through wear and/or corrosion mechanisms such as selective phase corrosion, cavitation erosion, erosion- corrosion and corrosion fatigue. Since it is an expensive material to replace, numerous methods have been adopted to ensure the extension of the service life of NA13 components. These methods include welding repair, laser surface finishing and metal clad-ding. The aim of the current work was to establish optimum procedures for repair of damaged NAB components by the application of a multi-pass welding. Detailed microstructural analysis has been conducted for the base metal, the weld metal and the HAG, before and after postweld heat treatment, to assess the effectiveness of the weld repair procedure.

Publication Date


  • 2013

Citation


  • Li, H., Larkin Gorham, J., Pan, Z., Van Duin, S., & Cuiuri, D. (2013). Repair of nickel aluminium bronze (NAB) components using multi-pass welding. Australasian Welding Journal, 58(4), 42-48.

Web Of Science Accession Number


Start Page


  • 42

End Page


  • 48

Volume


  • 58

Issue


  • 4

Abstract


  • Nickel aluminium bronze (NAB) is basically a dual-phase copper alloy that is commonly used in marine operations in which components are exposed to high stresses and corrosive conditions. NAB contains between 5 wt% -11 wt% aluminium with additions of nickel and iron. A typical alloy composition range is 8-13 wt%Al, 3-5 wt%Ni, 3-5 wt%Fe and 0-3 wt%Mn. With strengths equivalent to medium-grade carbon steeels, this cuprous alloy offers even higher corrosion resistance than most stainless steel materials in seawater. NAB inherits its outstanding corrosion resistance from the formation of a tough adherent film of aluminium oxide (Al203). It is this film that allows NAB to be used extensively in the marine components such as propeller blades, pump impellers and other underwater components. Despite the excellent qualities of NAB, it can still deteriorate during service through wear and/or corrosion mechanisms such as selective phase corrosion, cavitation erosion, erosion- corrosion and corrosion fatigue. Since it is an expensive material to replace, numerous methods have been adopted to ensure the extension of the service life of NA13 components. These methods include welding repair, laser surface finishing and metal clad-ding. The aim of the current work was to establish optimum procedures for repair of damaged NAB components by the application of a multi-pass welding. Detailed microstructural analysis has been conducted for the base metal, the weld metal and the HAG, before and after postweld heat treatment, to assess the effectiveness of the weld repair procedure.

Publication Date


  • 2013

Citation


  • Li, H., Larkin Gorham, J., Pan, Z., Van Duin, S., & Cuiuri, D. (2013). Repair of nickel aluminium bronze (NAB) components using multi-pass welding. Australasian Welding Journal, 58(4), 42-48.

Web Of Science Accession Number


Start Page


  • 42

End Page


  • 48

Volume


  • 58

Issue


  • 4