Excess weld metal

The reinforcement is usually due to traveling too slowly or feeding too much wire. Then the material piles up and forms a thick bead that is too sharp and too high at the transitions. That's bad because notches form there, where cracks can start later. The weld is not properly fused at the transitions, and the whole joint is not as strong. So better adjust travel speed and wire feed rather than cranking up the current. If the bead gets too high, you need to go faster or feed less wire so the puddle flows out cleanly.