Weldin and corrosion of AW7003
Weldin and corrosion of AW7003
(OP)
Hi!
I have heard that welding of the aluminium alloy AW7003 could give corrosion problems. The person that stated this could not however specify which type of corrosion problem welding could lead to. Does anyone know?
I know that the 7xxx generally is said to be prone to stress corrosion cracking. Is this of some reason worse in welded AW7003 or is there any other mechanism that could be suspected?
I have heard that welding of the aluminium alloy AW7003 could give corrosion problems. The person that stated this could not however specify which type of corrosion problem welding could lead to. Does anyone know?
I know that the 7xxx generally is said to be prone to stress corrosion cracking. Is this of some reason worse in welded AW7003 or is there any other mechanism that could be suspected?





RE: Weldin and corrosion of AW7003
For AW7003, I would be more concerned about cracks in the weld joint and reduced mechanical properties.
RE: Weldin and corrosion of AW7003
www.alcotec.com
They have a page on 7000 series aluminum, explaining why you don't want to attempt welding it.
RE: Weldin and corrosion of AW7003
RE: Weldin and corrosion of AW7003
"7XXX Series Alloys – (heat treatable – with ultimate tensile strength of 32 to 88 ksi) These are the aluminum / zinc alloys (zinc additions ranging from 0.8 to 12.0%) and comprise some of the highest strength aluminum alloys. These alloys are often used in high performance applications such as aircraft, aerospace, and competitive sporting equipment. Like the 2xxx series of alloys, this series incorporates alloys which are considered unsuitable candidates for arc welding, and others, which are often arc welded successfully. The commonly welded alloys in this series, such as 7005, are predominantly welded with the 5xxx series filler alloys."
As stated above, several of these 7XXX series may indeed be welded without hot cracks in the weld deposit, but you will degrade base metal mechanical properties without re-heat treatment. If you need more information, contact AlcoTec directly.