1. plastic welding
2. fusion welding
3. thermit welding
4. none of these
plastic welding
1. arc welding
2. gas welding
3. forge welding
4. all of these
forge welding
1. electric resistance welding
2. thermit welding
3. are welding
4. forge welding
electric resistance welding
1. spot welding
2. projection welding
3. seam welding
4. butt welding
spot welding
1. 0.25 mm to 1.25 mm
2. 1.25 mm to 2.50 mm
3. 2.5 mm to 3 mm
4. more than 3 mm
0.25 mm to 1.25 mm
1. stainless stell
2. copper
3. mild stell sheet
4. all of these
copper
1. 2
2. 3
3. 5
4. 8
5
1. stainless stell
2. aluminium
3. copper
4. brass
copper
1. d
2. 1.5 d
3. 3 d
4. 4.5 d
d
1. √t
2. 1.5 t
3. 3 t
4. 4.5 t
√t