NEW
Font size
WorksheetsMIG/MAG Welding Gases Quiz
Total questions: 10
Worksheet time: 5mins
What is the main purpose of shielding gas in MIG/MAG welding?
To cool the weld pool
To increase wire feed speed
To protect the weld pool from air contamination
To clean the base metal
Which welding process uses inert gases only?
MMA welding
MAG welding
MIG welding
Oxy-acetylene welding
MIG welding is mainly used for which type of materials?
Mild steel only
Aluminium and non-ferrous metals
Cast iron
Galvanised steel
MAG welding gases contain which type of gas?
Noble gases only
Inert gases only
Active gases
No shielding gas
Which gas is most commonly used on its own for welding mild steel?
Argon
Helium
Carbon dioxide (CO₂)
Oxygen
What is a typical advantage of using 100% CO₂ as a shielding gas?
Very smooth weld appearance
Low penetration
Deep penetration and low cost
No spatter
Which gas mixture is most commonly used for MIG/MAG welding mild steel?
100% Argon
Argon / Helium
Argon / CO₂ (e.g. 80/20)
Oxygen / Nitrogen
What effect does adding a small amount of oxygen to Argon have?
Reduces penetration
Improves arc stability and bead shape
Increases spatter
Prevents oxidation completely
Which gas is often added to Argon to increase heat input for thick aluminium?
Carbon dioxide
Oxygen
Nitrogen
Helium
Why is correct shielding gas selection important?
It changes the colour of the weld
It improves arc stability, penetration, and weld appearance
It increases machine power
It replaces correct technique
