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[Music] welcome to weld school this is a short video on basic lines for blueprint reading okay so when we start to look at these lines we need to understand what they all mean and how they affect the way that we read a blueprint so each line has a separate meaning and all lines will determine basically two things its going to determine the shape of an object okay and the dimensioning so we need to know the sizes of an actual part so im going to go ahead and im going to cover an object line first thats the most common the most important we need to know the shape of the part so if i can see if im looking straight down at this component were looking at 2d not 3d i can see this edge i can see this edge and i can see an edge right here so anytime we can see those edges that is considered an object line so im going to start right up here at the top and im going to try to draw this a little bit thick object lines are thick solid lines and it shows the visible part with that being sai