Podcast
Questions and Answers
Which of the following are used as fuel gases for OFC? (Select all that apply)
Which of the following are used as fuel gases for OFC? (Select all that apply)
- Propylene (correct)
- MAPP (correct)
- Acetylene (correct)
- Natural Gas (correct)
What does OFC stand for?
What does OFC stand for?
Oxy-fuel cutting
While making a cut with OFC, the inner cones of the flame should be held how far away from the surface of the metal?
While making a cut with OFC, the inner cones of the flame should be held how far away from the surface of the metal?
1/16" - 1/4"
What is required before making a good manual OFC? (Select all that apply)
What is required before making a good manual OFC? (Select all that apply)
With OFC, what is the result of a preheat flame that is too small/low? (Select all that apply)
With OFC, what is the result of a preheat flame that is too small/low? (Select all that apply)
OFC: Slag that is hard to chip off the bottom of the plate occurs because: (Select all that apply)
OFC: Slag that is hard to chip off the bottom of the plate occurs because: (Select all that apply)
OFC: Distortion is caused by:
OFC: Distortion is caused by:
What metal is easiest to weld with oxyacetylene?
What metal is easiest to weld with oxyacetylene?
With OFW, the size/diameter of the filler metal used has the following effect(s): (Select all that apply)
With OFW, the size/diameter of the filler metal used has the following effect(s): (Select all that apply)
The weld pool when OFW:
The weld pool when OFW:
OFW: What should happen as one finishes the end of the weld? (Select all that apply)
OFW: What should happen as one finishes the end of the weld? (Select all that apply)
When welding a thicker plate to a thinner plate with OFW, what should you do?
When welding a thicker plate to a thinner plate with OFW, what should you do?
What gas burns the hottest?
What gas burns the hottest?
What is the kindling temperature?
What is the kindling temperature?
Steel melts at what temperature?
Steel melts at what temperature?
What material is readily cut with OFC?
What material is readily cut with OFC?
Which of the following is common to both OFW and OFC? (Select all that apply)
Which of the following is common to both OFW and OFC? (Select all that apply)
Flashback can occur because of: (Select all that apply)
Flashback can occur because of: (Select all that apply)
OFC: What is kerf?
OFC: What is kerf?
Using a VICTOR brand, what is the correct tip size for OFC on 1/2" plate?
Using a VICTOR brand, what is the correct tip size for OFC on 1/2" plate?
What are the main advantages of OFC? (Select all that apply)
What are the main advantages of OFC? (Select all that apply)
OFW would be best for what thickness of plate? (Select all that apply)
OFW would be best for what thickness of plate? (Select all that apply)
A weld defect is: (Select all that apply)
A weld defect is: (Select all that apply)
All good welds should have a good appearance.
All good welds should have a good appearance.
Not all welds with good appearance are sound.
Not all welds with good appearance are sound.
R65 and RG45 are fillers that can be used for OFW.
R65 and RG45 are fillers that can be used for OFW.
Propane is the most frequently used fuel gas.
Propane is the most frequently used fuel gas.
The OFC process is a result of the metal being rapidly melted and blown away.
The OFC process is a result of the metal being rapidly melted and blown away.
Inspecting the drag lines of a cut can indicate correctly or incorrectly made cuts.
Inspecting the drag lines of a cut can indicate correctly or incorrectly made cuts.
Restricting the working pressure of ___________ helps reduce the risk of explosion.
Restricting the working pressure of ___________ helps reduce the risk of explosion.
Flashcards
What are the common fuel gases used in oxy-fuel cutting (OFC)?
What are the common fuel gases used in oxy-fuel cutting (OFC)?
Natural gas, propylene, acetylene, and MAPP are all commonly used as fuel gases in oxy-fuel cutting.
What is the proper distance between the inner cone of the OFC flame and the metal?
What is the proper distance between the inner cone of the OFC flame and the metal?
The inner cone of the oxy-fuel cutting flame should be positioned 1/16" - 1/4" away from the metal surface.
List three essential prerequisites for manual oxy-fuel cutting.
List three essential prerequisites for manual oxy-fuel cutting.
A neutral flame adjustment, a clean center hole in the tip, and proper gas pressures are crucial for successful manual oxy-fuel cutting.
What happens if the preheat flame in OFC is too small or low?
What happens if the preheat flame in OFC is too small or low?
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What factors can contribute to difficult-to-remove slag in OFC?
What factors can contribute to difficult-to-remove slag in OFC?
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What causes distortion in oxy-fuel cutting, and how can it be minimized?
What causes distortion in oxy-fuel cutting, and how can it be minimized?
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What is the kerf in oxy-fuel cutting?
What is the kerf in oxy-fuel cutting?
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Which metal is easiest to weld with oxyacetylene?
Which metal is easiest to weld with oxyacetylene?
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How does filler metal size impact OFW?
How does filler metal size impact OFW?
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What shields the weld pool in oxy-fuel welding, and how do filler metals improve the process?
What shields the weld pool in oxy-fuel welding, and how do filler metals improve the process?
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Describe the proper ending technique for oxy-fuel welding.
Describe the proper ending technique for oxy-fuel welding.
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How should you direct the torch heat when welding different thicknesses in OFW?
How should you direct the torch heat when welding different thicknesses in OFW?
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Which gas burns the hottest in oxy-fuel welding, and at what temperature does steel melt?
Which gas burns the hottest in oxy-fuel welding, and at what temperature does steel melt?
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For what thicknesses of metal is oxy-fuel welding commonly used, and what are typical applications?
For what thicknesses of metal is oxy-fuel welding commonly used, and what are typical applications?
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What causes flashback in welding and cutting?
What causes flashback in welding and cutting?
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Which filler metals are commonly used in OFW?
Which filler metals are commonly used in OFW?
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How can you assess the quality of an OFC cut?
How can you assess the quality of an OFC cut?
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What safety measure is recommended for acetylene to minimize explosion risks?
What safety measure is recommended for acetylene to minimize explosion risks?
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What are some common weld defects?
What are some common weld defects?
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What is the relationship between a weld's appearance and its structural integrity?
What is the relationship between a weld's appearance and its structural integrity?
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Which fuel gas is most frequently used in welding?
Which fuel gas is most frequently used in welding?
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What is a common misconception about oxy-fuel cutting?
What is a common misconception about oxy-fuel cutting?
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Study Notes
OFC (Oxy-Fuel Cutting)
- Fuel gases used include Natural Gas, Propylene, Acetylene, and MAPP.
- Inner cones of the flame should be held 1/16" to 1/4" away from the metal surface.
- Essential prerequisites for manual OFC include neutral flame adjustment, clean center hole in the tip, and proper gas pressures.
- If the preheat flame is too small/low, it can cause wandering cutting stream, require slower travel speed, and prolong cutting time.
- Issues like hard-to-chip slag can arise from too much preheat, incorrect oxygen pressure, wrong tip size, or a dirty cutting tip.
- Distortion occurs due to localized expansion and internal stresses; it can be minimized with proper techniques and sequencing.
- The kerf refers to the gap created by the diameter of the oxygen stream.
OFW (Oxy-Fuel Welding)
- Mild steel is the easiest metal to weld with oxyacetylene.
- Filler metal size influences the weld pool temperature and bead size.
- The weld pool is shielded by CO2 gas and benefits from silicon deoxidizers present in filler metals.
- As the weld ends, it is important to pause and add filler metal to fill the crater and slant the torch for cooling.
- Direct heat of the torch toward the thicker plate when welding different thicknesses.
- Acetylene burns the hottest among available gases, with steel melting at approximately 2700°F.
- OFW is suited for 1/8" plate or thinner, often for small jobs or repairs.
Welding and Cutting Safety
- Flashback may occur if mixed fuel burns inside the torch tips or hoses, or if the cutting or welding tips overheat.
- R65 and RG45 are acceptable fillers for OFW.
- Inspecting drag lines can indicate the quality of a cut.
- Restricting working pressure of acetylene can reduce explosion risks.
General Welding Knowledge
- A weld defect can include porosity, craters, or any unwelcome material in the weld area.
- All good welds should have an appealing appearance, but not all aesthetically pleasing welds are structurally sound.
- Propane is not the most frequently used fuel gas; that title goes to acetylene.
- The OFC process does not involve rapid melting and blowing away of metal, contrary to some misconceptions.
Studying That Suits You
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Description
Test your knowledge on Oxy-fuel Cutting (OFC) and related concepts with these flashcards. Each card presents a key term or question that is crucial for mastering welding techniques. Perfect for learners in the Welding 170 course.
