Finely found a weld that looks worse than mine!!

Tkanks guys. I don't know what filler he furnished. It was a square butt, no bevel. Did'n check penetration. My only experience with tig . Thinking about buying one.

I recently TIG butt welded 2 -1/8 inch 6061 plates in class. Butted tight together (misake?) got a perfect looking weld but
the weld cracked right down the middle. I asked instructor "what happened?" Reply "don't know" Don't think he was interested?


'