Welder Red Seal · Question
A welder is preparing to weld a full penetration butt joint on 2 mm thick 316L stainless steel sheet. To prevent oxidation and sugaring on the root side, what is the most effective backing technique?
To prevent oxidation and sugaring on the root of stainless steel, it is crucial to displace oxygen with an inert gas. Flooding the back of the joint with argon
Start free practice for Welder Red Seal
154 questions · no signup required · 40 free questions per day
Question: A welder is preparing to weld a full penetration butt joint on 2 mm thick 316L stainless steel sheet. To prevent oxidation and sugaring on the root side, what is the most effective backing technique?
Answer options:
- Applying a thin layer of anti-spatter spray to the back of the joint.
- Using a copper backing bar without gas purging. ✅ Flooding the back of the joint with argon shielding gas.
- Using an open-air purge with CO2 for a short duration.
Correct answer: Flooding the back of the joint with argon shielding gas.
Explanation: To prevent oxidation and sugaring on the root of stainless steel, it is crucial to displace oxygen with an inert gas. Flooding the back of the joint with argon shielding gas (a gas purge) effectively creates an inert atmosphere, protecting the molten weld metal from atmospheric contamination. Anti-spatter is for spatter, copper backing without gas still allows oxidation, and CO2 is not an inert gas.
Start free practice for Welder Red Seal
154 questions · no signup required · 40 free questions per day
More about Welder Red Seal
Related Questions
- A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies
- A welder is preparing to weld 20 mm (0.8 in) thick high-strength low-alloy (HSLA) steel using FCAW-G. The weld
- A structural steel fabricator is using FCAW-S (E71T-8 wire) to weld heavy sections of structural steel in an o
- When performing FCAW-G (gas-shielded flux-cored arc welding), a welder notices the arc is unstable and the wir
- A structural welder is performing overhead FCAW-G on 12 mm (0.5 in) thick steel with an E71T-1 wire. The weld
- A welder is setting up an FCAW-S machine for welding in a remote location without access to external shielding
More for Welder Red Seal candidates
Practice tests
Question explanations
- A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies
- A welder is preparing to weld 20 mm (0.8 in) thick high-strength low-alloy (HSLA) steel using FCAW-G. The weld
- A structural steel fabricator is using FCAW-S (E71T-8 wire) to weld heavy sections of structural steel in an o
- When performing FCAW-G (gas-shielded flux-cored arc welding), a welder notices the arc is unstable and the wir
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Welder Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.