Blueprint Reading for Welders
In Reading Blueprints for Welders, Students will learn about the following:
Basic Lines and Views
Sketching
Notes and Specifications
Dimensions
Bill of Materials
Structural Shapes
Other types of views
Types of Prints
Welding Symbols and Abbreviations
Different types of welds: Fillet welds, Groove welds, Back or Backing Melt-thru welds, Plug and Slot welds, Surfacing welds, Edge welds, Spot welds, Projection welds, seam welds, and stud welds.
Metric System for welders
Pipe welding symbols
Inspection and testing
International standard symbols for welding
Dual Dimensioning
Computer aided drafting
Geometric Dimensioning and tolerancing
Object Lines: Represents a thick solid line that shows the visible shape of an object or part. (outline of the Object)
Hidden Lines: Broken line of medium thickness that shows edges of an object or outlines not visible to the eye
Center Line: Broken line made up of short and long dashes alternately spaced that show the center of circles, arcs, and symmetrical objects.
Extension Line: Extension lines are fine lines that extend from the object with slight break between the show dimensioning points.
Dimension Line: fine lines with arrowheads, unbroken except where the dimension is placed that show distance given by the dimensions.
Leader: Fine, straight line with an arrowhead or round solid dot at one end that is usually drawn at an angle which is used to point directly to a surface for dimensioning or adding a note.
Preferred Cutting Plane Line: Heavy broken line made up of a series of one long and two small dashes alternately spaced. Arrowheads are placed at right angles to the cutting plane line. Indicates imaginary cuts made through object
Alternate Cutting plane line: solid heavy line or a series of long dashes with arrowheads placed at right angles.Indicates imaginary cut made through object
Section Lines: series of solid or solid and broken lines arranged in a specific pattern.
Chain Line: Heavy, broken line made up of a series of long and short dashes alternately spaced. Indicates location and extent of a surface area.
Short Break Line: Heavy, irregular line drawn freehand. shows a short break or show partial section.
Long break Line: Ruled, light line with freehand zigzags. Shows long break
Phantom Line: Light, Broken line made up of a series of one long and two short dashes.
Pictorial drawings present the object in a realistic and more easily understandable form.
Mechanical drawings are made as if you were looking through the sides of a glass box at the object and tracing its shape on the glass.
If all of the sides of the object were traced and the box unfolded and laid out flat, then there would be six basic views shown. This type of drawing is also called an orthographic projection.
