ER 5356 -  is a general-purpose type aluminum alloy which is typically chosen for its relatively high shear strength.  In addition, it also offers excellent corrosion resistance when exposed to salt water.  ER5356 should be considered for welding 5000 series aluminum base metals.
 
Typical Applications:  welding filler wire

 
AWS Class: ER5356
Certification:  AWS A5.10/ A5.10M:1999
Alloy:  ER 5356
AWS/ASME SFA A5.10
 

ER 4043  -  is a general purpose type aluminum welding wire.  It is one of the oldest and most widely used welding and brazing alloys.  This aluminum alloy contains silicon additives, which result in improved fluidity (wetting action) of the weld pool and also produces a weld less sensitive to cracking.  Its bright weld finish makes it a popular choice of welders.  ER4043 can be used to weld various grades of aluminum.   Typical Applications:  welding filler wire; spray and flame metalizing wire
AWS Class: ER 4043
Certification:  AWS A5.10/ A5.10M:1999
Alloy:  ER4043
AWS/ASME SFA A5.10