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Basic Lines and Views
Welding
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Basic Views
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Basic Views
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Types of Lines I
Object line is a thick and solid line.
To show visible shape of a part.
Hidden line is a broken line of medium thickness.
To show edges and outlines not visible to the eye.
Center line is a fine broken line made up of a series of short and long dashes, alternately spaced.
To show the center of circles, arcs, and symmetrical objects and to aid in dimensioning these parts.
Extension lines are fine lines that extend from the object with a slight break between.
Dimension lines are fine lines with arrowheads, unbroken except where the dimension is placed.
Extension line shows dimensioning points.
Dimension line touches the extension line and shows distance given by the dimensions.
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Types of Lines II
Leader line is a fine, straight line with an arrowhead or round solid dot at one end. It is usually drawn at an angle.
Points directly to a surface for the purpose of dimensioning or adding a note. A dot may be used at the end of the straight line where reference is made to a surface area.
The preferred cutting plane is a heavy, broken line made up of a series of one long and two short dashes alternately spaced. Arrowheads are placed at right angles to the cutting plane line as shown. Alternate cutting plane line is a solid heavy line on a series of long dashes.
To indicate where an imaginary cut is placed through the object. The arrow points in the direction in which the section should be viewed. Letters next to the arrowheads identify the section in cases where more than one section is shown on the drawing. These lines are oriented vertically, horizontally, or at the actual angle at which the part is drawn.
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Types of Lines III
Section line is a series of fine lines–solid or solid and broken–arranged in specific patterns. It may be shown either straight or curved. When shown straight, it is usually drawn at 45 degree angle. However this angle will vary when applied to adjacent parts.
To indicate the imaginary cut surface referred to by the cutting plane line. To represent various kinds of materials.
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Types of Lines IV
Indicates the location and extent of a surface area.
Chain Line is heavy, broken line made up of a series of long and short dashes, alternately spaced.
To show a short break (to conserve space on a drawing); to show a partial section.
Short-break line is heavy, broken irregular line, drawn freehand.
To show a long break (to conserve space on a drawing).
Long-break line is a ruled, light line with freehand zigzags.
To show alternate positions of a part; to show relationship of existing part to new part; to show machined surfaces.
Phantom Line is light, broken line made up of a series of one long and two short dashes.
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