Dimensions and Measurements
What are the three main types of dimensions used in blueprints?
Linear, Angular, Radial
What are the four common types of welds shown in welding symbols?
Fillet, Groove, Spot, Seam
What is the primary purpose of the arrow line in a welding symbol?
To identify the joint or member to be welded
What does a sheet metal flat pattern show?
The part before bending including dimensions, bend allowances, cut lines, holes
Draw a welding symbol for a fillet weld on the other side with a ground flush finish.
Students draw; check for arrow side, weld symbol, finish symbol
How should dimensions be presented to ensure clarity on a blueprint?
Clear and uncluttered with appropriate decimal places
What is the horizontal line in a welding symbol called?
Reference line
In a fillet weld, to which member does the arrow usually point?
The nearer member in the drawing's view
What type of line indicates a bend line on a sheet metal blueprint?
Thick dash-dot-dot line
Draw a sheet 24" x 12" bent up 90° at 6" from the 12" side, showing all dimensions and bend direction.
Students draw; check for correct bend line, dimension placement, and bend arrow
What does an angular dimension measure?
Angles in degrees
Where is the basic weld symbol placed in relation to the reference line?
Above or below the reference line
What does it mean if welding symbol information is placed below the reference line?
Weld on the arrow side
What information does a bend radius provide?
The radius of the bend curve on the sheet metal
Draw a welding symbol for a concave weld on the arrow side with a chipped clean finish.
Students draw; check weld symbol above or below reference line, finish symbol
Why are bend allowances important in sheet metal flat patterns?
They account for material stretching during bending and affect final dimensions
What extra information might be included in the tail of a welding symbol?
Welding process, special requirements, specification references
What does a flag at the junction of the arrow line and reference line signify?
The weld is a field weld, performed on site
What does a grain direction indicator show on a sheet metal drawing?
The direction of the metal grain for strength and finish considerations
Draw a sheet 5" x 5" bent up 45° at 3", including a 1/2" diameter hole located 2" from both edges on the unbent side.
Students draw; check hole placement, bend line, and dimensions
What is a common mistake to avoid when reading dimensions on blueprints?
Misinterpreting scale or missing hidden lines
What symbol indicates that a weld should be performed all around a joint?
All-around symbol
Where is a field weld performed?
At the construction site
What is a critical tolerance to check on a sheet metal assembly?
Final assembled dimensions including bends and holes
Draw a triangle sheet metal part 24" x 12" x 12" with a centered 1/2" hole.
Students draw; check triangle shape and hole placement