Week 6:Fabrication & Welded Connections Flashcards
List the 6 type of welds that are used to connect HSS members
1 Tack weld
2 Fillet weld (one-sided & double sided)
3 Joint penetration groove weld (complete & partial)
4 Flare groove welds
5 Flare bevel groove welds
6 Flare-V groove welds
What are the methods of connecting HSS members?
1 Bolted connections
2 Nailed connections (linked to bolted)
3 Welded connections
4 Slotted plate connections (linked to welded)
How many types of bolted connections did you learn about?
1 outside bolts
2 inside bolts
3 blind bolts
4 Flowdrill bolts
When should the strength enhancement factor not be used in fillet weld design checks?
1 when one-sided fillet weld is used
2 when the connection is in tension or under bending
What is the most important rule for detailing trusses?
Chord member should be a continuous member not intercepted by secondary members ie bracing
Which type of truss K-connection is preferred by fabricators and why?
Gapped k-connection due to reduced cost of fabrication
Which type of truss K-connection is preferred by designers and why?
Overlapped k-connection because of higher static, fatigue strength and reduced truss deflection
Which method is best for bending HSS.
Hot bending
Why is cold bending of HSS still utilised even though hot bending is the superior option?
-More econominal due to wide availability in North America
What is profiling?
Cutting a HSS to the right bevelled edge so it can be connected seamlessly to another member
What is an alternative to profiling HSS?
Partial of full flattening
What 2 things could go wrong with flattening a HSS?
- reduces compressive strength if fully flattened
- member cracking
What is the best way to flatten HSS?
Preheating to a dark red temperature and immediately flattening with a high-speed press
What must be provided in the process of galvanising sealed HSS tubes?
Provide vent and drain holes
List 3 ways to avoid liquid metal embrittlement during hot-dip galvanizing?
1- by using fully AL killed steel
2- increasing corner radii
3- testing a sample selection of the HSS tube before galvanising the entire member
How do you avoid water pooling in HSS, expanding during winter and causing cracks?
seal all HSS after construction or provide drain holes
What is CSA’s recommendation for minimum baseplate requirements for column stability during erection
All columns except small posts must be anchored to the foundation by at least 4 anchor rods/bolts
List the 5 methods for inspecting HSS construction
- Visual inspection
- Magnetic particle inspection
- Inspection by liquid penetrant
- Radiographic examination
- Ultrasonic examination
Explain why the yield line method is an upper bound method of plastic analysis of HSS connections?
Because it gives a solution greater than or equal to the plastic collapse load but less than the ultimate failure load
