Not Gonna Show You the Pictures

A while back I posted a picture of a MIG weld that had that stack of dimes 
look of a TIG weld.

This last weekend I was working on a fabrication project for my wife.  She

wanted me to make a light weight exo-skeleton for an actor in a play she
is 
involved in.  Basically a framework for a set of angle wings.  She is the 
costumer for the play so she will be doing the fabric and feathers over
the 
whole thing.

Anyway I immediately thought of aluminum.  I made a back piece shaped to
fit 
the actor's back by clamping it to my table saw and pounding it with a 
hammer.  That part worked out pretty good.

Then the for the actual wings I cut some 2 inch wide pieces 1/8" (0.125) 
5052 and designed a pivot point.  All pretty simple stuff.  I decided for
a 
little rigidity and stability without adding a lot of weight to weld a
piece 
of 3/8" (0.375) 5052 round rod to the edge of the long sheet pieces.  It 
worked pretty good for its intended purpose.

Now to the point of my post.  I tacked and the welded.  My welds looked a 
lot like the welds in that picture.  What did I do right or wrong?   I'm
not 
going to post a picture, because there are places where it does not look 
good where I had to go back over skip holes where I went to fast, and not 
all of the weld looks like that ridged stack of coins, but the vast
majority 
does look like that.  I looked at the other side, and I got pretty good 
penetration so I don't think I was cold welding or running under powered. 
I 
was running the wire quite a bit faster than Miller recommends, but I have

found that almost universally their guide line table puts the power right
on 
and the wire speed to slow on everything I have tried with aluminum.