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Measurement of the root gap in a T-JOINT weld 

root gap - the minimum distance between the ends of the elements to be welded which is measured during the assembly of the butt joint for welding


To measure the root gap, use the top High-Lo arm  separately from the main gauge plate . Position the taper gauge  in the groove, bringing it into contact with the ends of the elements to be welded as shown by the illustration. Take the value of the desired parameter from the scale denoted by the letter C.