Fabrication Techniques Flashcards
6 cards from real 308A practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Fabrication Techniques flashcards as text
What is a 'snap lock' seam used for in sheet metal fabrication?
Answer: Connecting round duct sections longitudinally with a self-locking seam that snaps together
A snap lock seam is a longitudinal seam used on round duct where one edge hooks over the other and snaps into a locked position. It provides a quick, secure connection without additional fasteners.
When operating a power squaring shear, what safety device prevents the operator's hands from entering the cutting area?
Answer: A holddown or finger guard assembly
Power squaring shears are equipped with holddown mechanisms and finger guards that physically prevent hands from reaching the blade area during operation. These are critical safety devices.
What is the purpose of a 'bar folder' in sheet metal fabrication?
Answer: To make narrow folds and hems on sheet metal edges for seams and safe edges
A bar folder creates narrow folds on the edges of sheet metal, typically for lock seams, hems, and edges. It produces consistent, uniform folds along the entire length of the metal edge.
What is 'grooving' in sheet metal work?
Answer: Flattening and locking a grooved seam by closing the folded edges tightly together
Grooving is the process of closing and flattening a grooved (lock) seam using a hand groover or a grooving machine. It mechanically locks the folded edges tightly together.
What is the correct sequence for fabricating a rectangular duct section?
Answer: Cut to size, form seam edges, notch corners, then bend to shape
The correct sequence is to cut the blank to size including seam allowances, form the seam edges (Pittsburgh pocket and lock), notch the corners, and then bend the blank into its rectangular shape.
What is 'burring' in sheet metal work?
Answer: Turning a narrow flange or edge on the end of a round pipe or disc
Burring is the process of turning a narrow flange (typically about 3/16 inch) on the edge of a round disc or pipe end using a burring machine. This flange is then used for wiring edges or creating seams.
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