What alum r you using 5053 6061,, 3/8 seems a bit thin. Especially where you weld..but what do i know... I just turned a twin engine bracket into the largest peice of lead weight. In less than an hour.. I definitly learned an expensive lesson.. Time and money. I wish i asked more questions before i vaporized the paint off my bracket... Good luck and its better to learn from other peoples mistakes.......
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