WELDING 4 TIG AND CO2 WELDING - Practice Mode
1) How the molten puddle is protected against atmospheric oxygen and nitrogen while using bare electrode in MAG welding?
Correct Answer: By shielding gas CO<sub>2</sub>
2) What is the purpose of inlet end of heater connected to gas cylinder in CO2 welding?
Correct Answer: Avoid ice forming of CO<sub>2</sub>
3) Which gas mixture is used in GMAW spray transfer for 25 - 76 mm thick Aluminium block?
Correct Answer: 75% Helium 25% Argon
4) What is the gas mixture used for copper, nickel and alloys of heavier gauge thickness in GMAW spray transfer?
Correct Answer: Helium - Argon
5) What is the normal preheating temperature for Aluminium Welding by TIG process?
Correct Answer: 180 Degree - 205 Degree Centigrade