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Re: Valley in my door skin weld
If you looked at a top-down view of that area of the door, it would show an ever so slight crown, or an arc. When you weld sheetmetal the weld and Heat Affected Zone will shrink when it cools. So absent any planishing effort, along this length of the weld the shrinking causes it to lose some of its length. So in essence, you arc becomes a straight line, or as you noted, is pulled into a valley. Planishing or stretching of the weld is needed.
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Robert
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