1. are welding
2. carbon arc
3. MIG
4. submerged arc
MIG
1. same
2. more
3. less
4. unpredictable
more
1. Non-combustible electrode in combination with helium and d.c.current
2. Combustible electrode and argon in combination with d.c.current
3. Straight polarity d.c. current
4. Carbon dioxide, because of its excellent penetration and high speed
Carbon dioxide, because of its excellent penetration and high speed
1. electric spot welding
2. seam welding
3. projection welding
4. none of these
none of these
1. work piece
2. centre of crater
3. bottom of crater
4. work piece minus electrode diameter
centre of crater
1. resistance welding
2. gas welding
3. fusion welding
4. forge welding
fusion welding
1. aluminium
2. stainless steel
3. magnesium
4. pure titanium
5. all of these
all of these
1. provide cooling effect
2. act as flux
3. act as shielding medium
4. facilitate welding process
act as shielding medium
1. former can be used to weld hard metals
2. former permits use of large currents by allowing higher deposition
3. welding rate is very fast
4. welding is completely automatic
former permits use of large currents by allowing higher deposition
1. stainless steel
2. copper
3. aluminium
4. mild steel
mild steel