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As the weld cools, the metal wants to shrink, so your job is to counteract the shrinkage and return the metal to its original shape. As soon as you finish the tack, position your hammer and dolly directly over the center of the weld and start hammering on-dolly. Don’t overdo it, though—you’re not hammering a nail into cement. Let the weight of the hammer do the work, but work fast. The whole procedure only lasts for about 15-20 seconds from beginning to end. You’ll eventually get the feel for when the metal has moved enough. View Related Article
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