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I have an old water tank 48"X16" and seems to be about 1/8" thick, with a couple pieces of steel that are a bit thicker one is 51"X14" wide and one 72"X16.5" also have a bunch of strips that are 6" wide and 6' long. Would it be best to weld the 6" pices right on the other to make it thicker or put a space between them to have a gap?