Hi, My friend at work is a master aircraft welder and he has told me that anything 7075 or 2024 alloy that is welded is very likely to crack either at the weld or right next to it. The weld may look ok but dont trust it or use it on anything critical as its not liable to last very long. If its for a bracket for a mailbox or something like that fine but not a racecar or airplane part. Dave