Blueprint Reading & Symbols Flashcards

What does a dashed reference line parallel to the main reference line indicate on a welding symbol?

Answer: The other-side weld symbol information

A dashed (hidden) reference line placed below the main reference line carries the other-side weld symbol when it differs from the arrow-side weld, used in older drawings per AWS A2.4.

Which symbol indicates a fillet weld?

Answer: A right triangle

The fillet weld symbol is a right triangle (isosceles right triangle) placed on the reference line, with the vertical leg always toward the reference line and the horizontal leg away from it.

The tail of a welding symbol is used to:

Answer: Reference a specification, process, or other note

The tail (forked end) of the welding symbol reference line is used to reference a welding specification, process abbreviation (e.g., SMAW, GTAW), or other supplementary information.

A surfacing weld symbol is used to indicate:

Answer: A weld applied to a surface to build up or restore dimensions

The surfacing weld symbol (a wavy line on the reference line) indicates a weld deposit applied to a surface to restore dimensions, build up material, or provide a wear-resistant layer.

In a welding symbol for an intermittent fillet weld, '4-10' to the right of the symbol means:

Answer: 4 inch weld segments spaced 10 inches apart (center-to-center)

For intermittent welds, the format is length-pitch. '4-10' means each weld segment is 4 units long and segments are spaced 10 units center-to-center (pitch).

What does the number inside parentheses on a spot or seam weld symbol indicate?

Answer: Number of spot welds required

Parentheses enclosing a number on a spot or seam weld symbol indicate the number of spot welds required in that area.