1. materials to be welded
2. type of welding process
3. thickness of material
4. voltage used
thickness of material
1. A.C. low frequency
2. A.C. high frequency
3. D.C.
4. All of these
D.C.
1. flow of current
2. voltage
3. material characteristics
4. contact resistance
contact resistance
1. 18-40 volts
2. 40-95 volts
3. 100-125 volts
4. 130-170 volts
40-95 volts
1. protective layer
2. binder
3. slag
4. flux
flux
1. where longitudinal shear is present
2. where severe loading is encountered and the upper surface of both pieces must be in the same plane
3. to join two pieces of metals in the same manner as rivets join matals
4. there is nothing like plug weld joint
to join two pieces of metals in the same manner as rivets join matals
1. Laser welding
2. MIG welding
3. TIG welding
4. Lon beam welding
TIG welding
1. 18-40 volts
2. 40-95 volts
3. 100-125 volts
4. 130-170 volts
18-40 volts
1. 25mm thick
2. 40mm thick
3. 50mm thick
4. 60mm thick
25mm thick
1. hydrogen and oxygen
2. CO2 and H2
3. argon and neon
4. argon and helium
argon and helium