1. Sheet Metal Fasteners

2. Sheet Metal Fasteners
What scientific principle defines a fasteners strength?
What are the three ways we can connect sheet metal?
Why are some methods preferable to others?

3. How do fasteners work? Fastener strength is dependent on surface area.
Mechanical fasteners rely on clamping force

4. Sheet Metal Fasteners The three ways to fasten sheet metal are:
Mechanical Fasteners
Welding
Adhesives

5. Mechanical Sheet Metal Fasteners
Threaded Fasteners
Rivets

6. Threaded Fasteners
Screws - A headed threaded fastener that is designed to be used by forming its own threads.
Bolt - A bolt is the term used for a headed fastener having external threads that meet an exacting, uniform bolt thread specification

7. Threaded Fasteners

8. Rivets
 a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the buck-tail. On installation the rivet is placed in a punched or drilled hole, and the tail is upset, or bucked (i.e., deformed), so that it expands to about 1.5 times the original shaft diameter, holding the rivet in place.

9. Rivets

10. Welding
Spot
MIG/TIG

11. Spot Welding
contacting metal surfaces are joined by the heat obtained from resistance to electric current.

12. MIG/TIG Welding
contacting metal surfaces are joined by the heat obtained from the electric arc.

13. Spot Weld With a MIG

14. Adhesives
Epoxy – Simply put, epoxy is a two part, very high strength, glue.
Two parts:
Resin
Hardener

15. Sheet Metal Epoxy Application

16. Conclusion How has the Industrial revolution effected fasteners?
What type of fastener or fastening system do you think would be the:
Strongest:
Fastest to install:
Best looking:
Most permanent:
Easley removed:
Require “special tools”: