Blueprint Reading & Interpretation Flashcards

On a welding symbol, what does a flag symbol on the reference line indicate?

Answer: Field weld

A flag symbol on the reference line indicates a field weld, meaning the weld is to be performed at the installation site rather than in the shop.

What does the letter 'N' in a welding symbol tail typically stand for?

Answer: Non-destructive testing required

The letter 'N' in the tail of a welding symbol indicates that non-destructive testing is required on that weld.

In blueprint reading, what does a hidden line (dashed line) represent?

Answer: An edge or feature not visible from the current view

Hidden lines, drawn as dashed lines, represent edges or features that exist behind or beneath the visible surface in that view.

What is the purpose of a revision block on an engineering drawing?

Answer: To record changes made to the drawing after initial release

The revision block documents changes made to the drawing after it was originally issued, including revision number, description, date, and approval.

On a welding symbol, dimensions placed to the LEFT of the weld symbol indicate:

Answer: Weld size or depth of preparation

Dimensions to the left of the weld symbol indicate the size, depth of groove preparation, or throat size of the weld.

What type of line is used to indicate a cutting plane on an engineering drawing?

Answer: Chain line with thick ends and arrows

A cutting plane line is a chain line (alternating long and short dashes) that is thick at the ends with arrows indicating the direction of viewing.

When a welding symbol shows dimensions as '3/8-2-6', what does the '6' represent?

Answer: Pitch (center-to-center spacing) of 6 inches

In intermittent weld notation (size-length-pitch), the last number represents the pitch, or center-to-center spacing between welds.