MIG WELDING PRACTICE EXAM (UK STANDARD) 2026
PRACTICE EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
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Exam Board Content Areas Covered
1 Welding Safety and PPE
2 MIG Welding Equipment and Setup
3 Shielding Gases and Materials
4 Welding Techniques and Positions
5 Weld Defects and Inspection
6 Electrical Principles in Welding
7 Maintenance and Troubleshooting
Questions
1 What does MIG stand for in welding
A Metal Inert Gas
B Manual Industrial Gas
C Mechanical Inert Guide
D Metal Internal Gas
Answer: A Metal Inert Gas
This is the correct definition of MIG welding, referring to the shielding gas used to
protect the weld.
2 What is the primary function of shielding gas in MIG welding
A Cool the weld
B Protect molten weld pool from contamination
C Increase voltage
D Clean the metal surface
Answer: B Protect molten weld pool from contamination
Shielding gas prevents atmospheric gases like oxygen from causing defects.
,3 Which gas is commonly used for welding mild steel
A Argon
B Helium
C Carbon dioxide
D Nitrogen
Answer: C Carbon dioxide
CO₂ is widely used for cost-effective welding of mild steel.
4 What type of electrode is used in MIG welding
A Stick electrode
B Flux-coated rod
C Consumable wire
D Tungsten rod
Answer: C Consumable wire
The wire acts as both electrode and filler material.
5 What is the typical polarity used in MIG welding
A AC
B DC electrode negative
C DC electrode positive
D Reverse AC
Answer: C DC electrode positive
This provides stable arc and proper penetration.
6 What is spatter in welding
A Smooth weld finish
B Metal droplets expelled from weld
C Gas leakage
D Electrode melting
Answer: B Metal droplets expelled from weld
Spatter is unwanted and indicates poor settings.
7 What PPE is essential for MIG welding
A Safety glasses only
B Welding helmet, gloves, protective clothing
, C Ear plugs only
D Boots only
Answer: B Welding helmet, gloves, protective clothing
Full PPE protects from UV radiation, heat, and sparks.
8 What is the function of the wire feed unit
A Controls gas flow
B Feeds wire electrode continuously
C Controls voltage
D Cools the torch
Answer: B Feeds wire electrode continuously
Ensures steady supply of filler material.
9 What causes porosity in a weld
A Excess heat
B Lack of shielding gas
C Low current
D Fast travel speed
Answer: B Lack of shielding gas
Gas contamination leads to trapped bubbles.
10 What is the recommended torch angle for MIG welding
A 0 degrees
B 5–15 degrees
C 45 degrees
D 90 degrees
Answer: B 5–15 degrees
A slight angle ensures proper gas coverage and control.
11 What is a weld bead
A The electrode
B The deposited metal
C The gas flow
D The power source
PRACTICE EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
Exam Board Content Areas Covered
1 Welding Safety and PPE
2 MIG Welding Equipment and Setup
3 Shielding Gases and Materials
4 Welding Techniques and Positions
5 Weld Defects and Inspection
6 Electrical Principles in Welding
7 Maintenance and Troubleshooting
Questions
1 What does MIG stand for in welding
A Metal Inert Gas
B Manual Industrial Gas
C Mechanical Inert Guide
D Metal Internal Gas
Answer: A Metal Inert Gas
This is the correct definition of MIG welding, referring to the shielding gas used to
protect the weld.
2 What is the primary function of shielding gas in MIG welding
A Cool the weld
B Protect molten weld pool from contamination
C Increase voltage
D Clean the metal surface
Answer: B Protect molten weld pool from contamination
Shielding gas prevents atmospheric gases like oxygen from causing defects.
,3 Which gas is commonly used for welding mild steel
A Argon
B Helium
C Carbon dioxide
D Nitrogen
Answer: C Carbon dioxide
CO₂ is widely used for cost-effective welding of mild steel.
4 What type of electrode is used in MIG welding
A Stick electrode
B Flux-coated rod
C Consumable wire
D Tungsten rod
Answer: C Consumable wire
The wire acts as both electrode and filler material.
5 What is the typical polarity used in MIG welding
A AC
B DC electrode negative
C DC electrode positive
D Reverse AC
Answer: C DC electrode positive
This provides stable arc and proper penetration.
6 What is spatter in welding
A Smooth weld finish
B Metal droplets expelled from weld
C Gas leakage
D Electrode melting
Answer: B Metal droplets expelled from weld
Spatter is unwanted and indicates poor settings.
7 What PPE is essential for MIG welding
A Safety glasses only
B Welding helmet, gloves, protective clothing
, C Ear plugs only
D Boots only
Answer: B Welding helmet, gloves, protective clothing
Full PPE protects from UV radiation, heat, and sparks.
8 What is the function of the wire feed unit
A Controls gas flow
B Feeds wire electrode continuously
C Controls voltage
D Cools the torch
Answer: B Feeds wire electrode continuously
Ensures steady supply of filler material.
9 What causes porosity in a weld
A Excess heat
B Lack of shielding gas
C Low current
D Fast travel speed
Answer: B Lack of shielding gas
Gas contamination leads to trapped bubbles.
10 What is the recommended torch angle for MIG welding
A 0 degrees
B 5–15 degrees
C 45 degrees
D 90 degrees
Answer: B 5–15 degrees
A slight angle ensures proper gas coverage and control.
11 What is a weld bead
A The electrode
B The deposited metal
C The gas flow
D The power source
