Certified Welder Cheat Sheet 2026

The 30 highest-yield Certified Welder facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which characteristic of copper alloys makes them difficult to weld with high heat input? → Very high thermal conductivity causing rapid heat dissipation
2. What is the primary function of shielding gas in arc welding? → Protect the weld area from contaminants
3. Hydrogen-induced cracking (HIC) in welds is most likely to occur: → After the weld cools below approximately 300°F (149°C)
4. How does peening a weld bead between passes help control distortion? → It stretches the weld metal to counteract contraction stresses
5. Which of the following best describes 'lamellar tearing'? → Subsurface cracking in the base metal caused by through-thickness stresses
6. What is the correct action when a SMAW electrode starts to 'stub' or stick to the base metal? → Release the electrode from the holder quickly to break the circuit
7. An E7018 electrode in SMAW is classified as a: → Low-hydrogen, iron powder electrode suitable for all positions
8. According to AWS D1.1, visual inspection of a weld must be performed by a person with minimum vision of: → 20/40 corrected or uncorrected vision in at least one eye
9. What is the included angle typically used for a single-V groove weld in structural steel applications? → 60 degrees
10. Which welding position is designated as '2F' in AWS terminology? → Horizontal fillet weld
11. A Charpy V-notch test primarily evaluates which mechanical property of a weld? → Toughness (impact resistance)
12. Before starting any welding task, what must always be checked? → If the area and equipment are safe
13. According to ANSI Z49.1, what minimum ventilation rate is required for welding in a confined space without mechanical ventilation? → No welding is permitted in confined spaces without mechanical ventilation
14. Which position qualifier, when passed on a groove weld test, also qualifies the welder for fillet welds in ALL positions? → 3G (vertical groove)
15. Under AWS D1.1, which discontinuity type is considered a 'crack' and is always rejectable regardless of size? → Longitudinal crack in the weld metal
16. What should a welder do if the electrode holder becomes extremely hot during SMAW? → Check for a loose connection or undersized cable, then allow it to cool
17. Crater cracks in a weld are best prevented by: → Using a run-off tab or backfilling the crater before breaking the arc
18. What AWS standard covers welding procedures for sheet metal (thin-gauge) structural applications? → AWS D1.3
19. In oxyfuel cutting, what actually cuts the steel? → A high-pressure stream of pure oxygen oxidizing (burning) the iron
20. When inspecting a completed weld, which condition requires removal and rewelding rather than blending or grinding as a repair? → Cracks of any size
21. According to AWS standards, a welder who qualifies in the 6GR position (pipe with restriction ring) is qualified to weld in which other positions? → All groove and fillet weld positions on both plate and pipe
22. In AWS D1.1, a 'prequalified' WPS means: → The procedure meets all listed conditions and does not require a PQR
23. What is the primary effect of increasing the carbon content in a steel base metal on its weldability? → It increases hardness and strength, making it more susceptible to cracking.
24. When performing Gas Tungsten Arc Welding (GTAW) on aluminum, which type of current and tungsten electrode tip preparation is most commonly recommended? → AC with a balled tip
25. Which AWS D1.1 provision governs the repair of unacceptable welds? → Clause 5
26. Which type of distortion is caused by unequal transverse shrinkage through the thickness of a weld joint? → Angular distortion
27. What is the maximum allowable undercut depth on the face of a groove weld in a primary tension member per AWS D1.1? → 1/32 inch (0.8 mm)
28. What potential defect is most associated with improper technique when welding in the overhead (4G/4F) position? → Excessive convexity or icicles of metal hanging from the weld
29. A welder is preparing aluminum base metal for GTAW. Which preparation step is unique to aluminum compared to steel? → Mechanical removal of the oxide layer immediately before welding
30. Under AWS D1.1, how long is a welder qualification (WPQ) valid if the welder has not welded with the qualified process for more than 6 months? → It expires and must be renewed