1. thermit welding
2. gas welding
3. arc welding
4. resistance welding
thermit welding
1. gas welding
2. arc welding
3. TIG welding
4. MIG welding
gas welding
1. inner cone
2. outer cone
3. next of inner cone
4. tip of the flame
inner cone
1. 12000 C
2. 18000C
3. 24000C
4. 32000C
32000C
1. solid form
2. liquid form
3. gaseous form
4. all of these
liquid form
1. carbon
2. crushed bone
3. charcoal
4. all of these
crushed bone
1. calcium chloride
2. calcium carbide
3. calcium carbonate
4. carbon
calcium chloride
1. 3 mm
2. 6 mm
3. 15 mm
4. 300 mm
3 mm
1. gas welding
2. spot welding
3. seam welding
4. all of these
gas welding
1. neutral flame
2. oxidising flame
3. carburizing
4. all of these
neutral flame