Oxyfuel 1
What items must be worn when using the oxy-fuel process
Boots,safety glasses, Face shield,gloves,
What lens shade is recommended for use when using Oxy-fuel cutting?
Shade 5
What is slag?
Burned oxides
What are the three sides of a fire triangle?Fuel,heat,and_______________
Oxygen
What must be done before cutting on any job.Hint to make the job safe
A hazard assessment must be done first.
While using the oxy-fuel cutting process,when does the cutting begin.
When the oxygen flow begins.
What is used for oxy-fuel cutting on metals that are oxidation resistant?
Flux
Which fuel gases can be used in the oxy-fuel cutting process.
Acetylene,propane,and natural gas.
How does the oxy-fuel gas process work?
It causes rapid oxidation that forms a molten slag and is blown off the metal.
A backfire occurs where
The torch tip
What is a possible cause of flashback?
Having oxygen and acetylene mixed in the acetylene hose. Not purging the lines properly. Overheating the torch tip.
What device prevents flashbacks from travelling further?
Flashback arrestor
Why should you protect oxy-fuel hoses from sparks and slag?
Can cause a fire ,Makes the hoses weak and prone to leaks.
Which fuel gases are lighter than air and will rise?
Natural gas and acetylene
Zinc is used in what type of metal coating?
Galvanized coatings
When are preheat flames active during the oxy-fuel cutting process?
As soon as the torch is ignited.
What is washing?
Removal of bolts
What is scarfing?
Removal of a thin layer of metal.
Why is oxy-fuel cutting mainly limited to low and medium carbon steel?
They are easily oxidized.
Why are non-ferrous metal difficult to cut using the oxy-fuel process?
These metals have little to no iron to create oxidation.
How can surface hardening be prevented?
Preheating and post- heating
Which technique is used to prevent distortion on thin material?
Make intermittent cuts.
Why are oil and gas a hazard while working with the oxy-fuel process?
They become explosive in the presence of oxygen.
What is required while cutting pipe that is known to have a Teflon lining?
Respirator and adequate ventilation.
Why is a flashback a serious burn hazard?
It can cause an explosion.