You're being paranoid. We trust our lives to welds every time we ride. Frame, A arms, swingarm, etc. The only way that the kicker could not be welded successfully, would be if it was made out of cast iron. Trust me, it's not. If it was, you could clamp it in the vice, whack it with a hammer and break it right in half. Show it to one of your welder buddies and see what they say. But, it's your kicker, your confidence level, you decide.