Welder Red Seal · Question
A welder is setting up an oxy-fuel cutting torch to cut a 12 mm mild steel plate. They notice that the preheat flames are very long and feathery. What is the most likely issue with the gas mixture?
Long, feathery preheat flames indicate an excess of fuel gas, specifically acetylene, relative to the oxygen. This results in a carburizing flame which is too r
Start free practice for Welder Red Seal
154 questions · no signup required · 40 free questions per day
Question: A welder is setting up an oxy-fuel cutting torch to cut a 12 mm mild steel plate. They notice that the preheat flames are very long and feathery. What is the most likely issue with the gas mixture?
Answer options: ✅ Too much acetylene for the oxygen
- Too much oxygen for the acetylene
- Insufficient gas pressure for both gases
- Excessive cutting oxygen pressure
Correct answer: Too much acetylene for the oxygen
Explanation: Long, feathery preheat flames indicate an excess of fuel gas, specifically acetylene, relative to the oxygen. This results in a carburizing flame which is too rich in fuel. Reducing the acetylene flow or increasing the oxygen flow would correct this.
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.