[markct]

</font><font color="blue" class="small">( Aluminum also has great fatigue strength in the better alloys like 6061 T-6. Ask any 747 pilot! )</font>


true, but once you weld it you lose the temper of it and thus the temper and fatigue resistance is less. if you notice, most airplane parts are riveted and bolted, very little welding, and the parts that are welded are then heat treated after welding, this cant usualy be done in a home shop since it would take a huge oven for a trailer