makes a noise like crack or like when a fan hits something only when over 40

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My metro makes a noise like a clank clank noise when accelerating at certain miles, doesn't make the sound if going slower or when first starts,only when going fast.Does not have engine lights on. Recently where the wheel is attach on the passenger side that broke down I thought it was a tie rod or something related but it wasn't. I got it fix is weld and reinforce..I wonder if that might be something that got loose when it hit the floor or if it might be the fan..I can feel inside the sound like when the car goes faster..a not sure if when the car goes faster also the fan will acelarate too...I really don't think is the motor but not sure..I had a car before that used to make a similar noise,it overheated and broke down how ever the check engine was on..not on the metro..this is a well taken care car..it has only 84,000 original miles.. The inside is almost new the rugs the seats everything... Please help me at least some hints... Also all he's oils are on point ..like a said no check engine on and all the lights work fine...