metal joining processes Flashcards
1
Q
MIG welding
A
- electrode wire and inert gas (CO2 or argon) used
- for thin gauge metals, medium carbon steel and aluminium
- one off or on an assembly line
- climbing frames
- bike frames
- vehicle exhausts
2
Q
TIG welding
A
- uses filler rod
- accurate and strong welds
- requires high skill
- slow
- uses inert gas (argon or helium)
- stainless steel ladders for boats or swimming pools
- welding stainless steel car exhausts
3
Q
oxy-acetylene welding
A
- uses steel filler rod
- useful for quick repairs
- good for remote locations where there is no electric power supply
- used to weld mild steel sheet/tube/plate where arc welding processes are not available
4
Q
spot welding
A
- sheet held between two copper electrodes that form a weld when the charged electrodes make contact with metal
- used to weld mild steel sheet metal at points along a length
5
Q
soldering
A
- uses filler material of lower melting point than the metal being joined
- typically an alloy of tin and copper
- lightweight applications
- joining precious metals
- for jewellery
- joining copper pipes in plumbing
6
Q
brazing
A
- brass filler rod
- uses oxy-acetylene or a gas and compressed air brazing hearth
- one off or small batch production
- used to join dissimilar metals
- lower temperature than welding so suitable for joining thinner gauge metals
7
Q
riveting and pop riveting
A
- riveting uses two pieces that are overlapped and drilled with the end of the shaft then hammered over to join
- pop riveting uses a rivet gun and rivet to join, is good for where the underside of a joint is inaccessible
- sheet metal or plate joining
8
Q
temporary fasteners and joining methods
A
- used where a permanent joining method is not required
- used in situations where a product may need to be disassembled or accessed for repair
9
Q
self tapping screws
A
- for joining thin sheet metal
- pilot hole drilled through, and as the screw is screwed in it cuts its own thread which holds the screw in place
10
Q
machine screws
A
- the thread is the whole length of the shaft
- to join thicker pieces of metal
- top part has a clearance hole bigger than the thread on the bolt
- bolt goes through this and screwed into a threaded hold in second piece
11
Q
nuts and bolts
A
- similar to machine screws
- go all the way through both pieces of metal
- nut is tightened onto the end to keep the pieces together
