by Panu » Wed Oct 26, 2022 20:30 pm
[quote=alex post_id=34638 time=1666766565 user_id=207]
It is true, old aluminium doesn't weld well.
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Actually it welds well but the microstructure must be harmoniced first by anealing the work piece and then to do precipitaion hardening again. The fact that it is not normal that workshop has a heat trestment furnace, makes the end result questinable... #-o
For this reason it makes sense that aluminium railroad carts are being welded by stir welding witch is kind of friction welding method without HAZ (Heat Affected Zone) problems in the material. Because of that heat treatment afterward is not required. I can't imaging the furnace big enough to fit in a railroad cart... :shock: #-o [-o< :roll: :lol: