I need to bend some 3mm aluminium sheet and weld it to some cast aluminium. Should i get a bendable grade such as 1050H14 / S1BH4 or 6000 series in a T6 state and heat it up to bend it? I'd rather it wasn't permanently bendy to be honest and i don't know how the bendy grade weld?. Its an engine sump I'm working on. Cheers