Welding aluminium alloys

Details Welding aluminium alloys Welding aluminium alloys

B - Operations, Transporting

32

B

13/6, 75/82

B32B 15/20 (2006.01) B23K 35/00 (2006.01) B23K 35/28 (2006.01) C22C 21/06 (2006.01)

Patent

CA 1302741

ABSTRACT Problems are caused by stress corrosion cracking and exfoliation cracking in the heat-affected zones adjacent welds in structure of welded components formed of Al alloys, particularly of the 7000 series but also of the 5000 series. The invention seeks to overome these by the use of Al-Mg welding wire containing 0.01- 0.5% Ga and/or In and/or Sn, the composition being chosen such that the weld bead has a potential at least as electronegative as the components and preferably in the range -1200 to -1130 mV with reference to a standard calomel electrode. To prevent diffusion of Ga/In/Sn, the components may be pre-coated eg by using a double-pass welding technique.

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