Joining

Question 1

Spot welding

Answer 1

Permanently joins thin sheet components made from like metals (ie mild steel, aluminum, stainless steel)
Electric current heats and fuses the metal. Localized heating avoids heat distortion

Question 2

Electric arc welding

Answer 2

Permanently joins a wide range of components make from like metals (ie mild steel, aluminum, stainless steel)
Uses high temperature electric arc to melt and fuze both components
++additional filler rod (from the same material) can be used to help form joint

Question 3

Brazing

Answer 3

Permanently joins thin walled and other steel components
Uses brass filler rod and lower temperatures than welding to avoid heat distortion
The parent metal is not melted during brazing

Question 4

Soldering

Answer 4

Used to join copper pipework and wiring
Uses a low melting point mix of tin and lead…so similar to brazing but at much lower temperatures
Lower temperatures means lower strength joint

Question 5

Bonding

Answer 5

Used to join different and combinations of materials through the usage of adhesives
Ie epoxy resisns are used for high strength joints of components with different materials, like metal to a polymer

Question 6

Permanent fastening

Answer 6

Rivets, pop rivets

Question 7

Non-permanent fastening

Answer 7

Machine screws, nuts bolts and washers (for strong join)