WIT-10
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Questions and Answers

Which heating method for brazing relies on the heat produced in a metal when placed within an induction coil?

  • Torch brazing (TB)
  • Induction brazing (IB) (correct)
  • Furnace brazing (FB)
  • Resistance brazing (RB)

    • Which brazing method involves heating the base metal using its own inherent electrical resistance?

  • Resistance brazing (RB) (correct)
  • Furnace brazing (FB)
  • Torch brazing (TB)
  • Induction brazing (IB)

    • Which method of brazing can be done either manually, mechanically, or automatically, and involves heating using an oxyfuel flame?

  • Furnace brazing (FB)
  • Induction brazing (IB)
  • Torch brazing (TB) (correct)
  • Resistance brazing (RB)

    • In which brazing method are the braze filler material and flux preplaced at or near the joint, and the parts to be joined are then placed in a furnace for controlled heating?

    <p>Furnace brazing (FB)</p> Signup and view all the answers

    What is a potential consequence of not completely removing cutting fluids from material surfaces prior to welding?

    <p>Porosity and cracking may result</p> Signup and view all the answers

    Which mechanical cutting method is used for joint preparation, weld contouring, and removal of defective welds?

    <p>Grinding</p> Signup and view all the answers

    Why should a welding inspector understand how mechanical cutting methods are used in welding?

    <p>Misapplication may degrade final weld quality</p> Signup and view all the answers

    What is the primary difference between dip brazing (DB) and other types of brazing?

    <p>Parts are immersed in a molten bath for heating</p> Signup and view all the answers

    What is the primary heating source in infrared brazing (IRB)?

    <p>Radiant energy</p> Signup and view all the answers

    What is a limitation of brazing?

    <p>Parts must be extremely clean prior to brazing</p> Signup and view all the answers

    What is the temperature needed for oxyfuel gas cutting (OFC) to heat steel to readily oxidize?

    <p>About 1700°F [925°C]</p> Signup and view all the answers

    What is the purpose of the high pressure stream of cutting oxygen in oxyfuel gas cutting (OFC)?

    <p>To produce an oxidation reaction and remove slag and oxide residue</p> Signup and view all the answers

    What is the main equipment used for oxyfuel gas cutting (OFC)?

    <p>Cutting attachment with a special cutting tip</p> Signup and view all the answers

    What is the purpose of dip brazing (DB)?

    <p>To provide the necessary heating by immersing parts in a molten bath</p> Signup and view all the answers

    What is a concern regarding the base metal in brazing?

    <p>Corrosion by some of the extremely reactive fluxes</p> Signup and view all the answers

    What is a significant advantage of brazing?

    <p>Ability to join dissimilar metals</p> Signup and view all the answers

    What is the primary limitation of brazing?

    <p>Parts must be extremely clean prior to brazing</p> Signup and view all the answers

    What is the temperature range for the activity of brazing flux FB1-A?

    <p>1080–1140°F [560–615°C]</p> Signup and view all the answers

    What is the primary purpose of the high pressure stream of cutting oxygen in oxyfuel gas cutting (OFC)?

    <p>To produce an oxidation reaction and remove slag and oxide residue</p> Signup and view all the answers

    What is the primary disadvantage of the Air Carbon Arc Cutting (CAC-A) process?

    <p>It is inherently a very noisy and dirty process.</p> Signup and view all the answers

    Which element has no effect in amounts usually tolerated in steel?

    <p>Phosphorus</p> Signup and view all the answers

    What is the effect of aluminum in steel?

    <p>It is not appreciable unless present in large amounts.</p> Signup and view all the answers

    What is the primary advantage of Air Carbon Arc Cutting (CAC-A)?

    <p>It is a relatively efficient method for removal of metal.</p> Signup and view all the answers

    What is the effect of high percentages of sulfur in steel during cutting?

    <p>The rate of cutting is reduced and sulfur dioxide fumes are noticeable.</p> Signup and view all the answers

    What is the effect of copper in steel in amounts up to about 2%?

    <p>It has no effect.</p> Signup and view all the answers

    What is the effect of vanadium in the amounts usually found in steels?

    <p>It may improve rather than interfere with cutting.</p> Signup and view all the answers

    What is the effect of high molybdenum-tungsten steels during cutting?

    <p>They may be cut only by special techniques.</p> Signup and view all the answers

    What is the effect of tungsten in the usual alloys with up to 14% during cutting?

    <p>They can be cut very readily.</p> Signup and view all the answers

    What is the effect of molybdenum on cutting, similar to chromium?

    <p>It affects cutting about the same as chromium.</p> Signup and view all the answers

    What is the effect of aircraft quality chrome-molybdenum steel during cutting?

    <p>It offers no difficulties.</p> Signup and view all the answers

    What is the primary application of Plasma Arc Cutting (PAC)?

    <p>For the removal of metal rather than joining pieces together.</p> Signup and view all the answers

    Which gas can be used for oxyfuel cutting with different efficiencies and may require modified cutting tips?

    <p>Acetylene</p> Signup and view all the answers

    What is the primary material for oxyfuel cutting?

    <p>Carbon and low alloy steels</p> Signup and view all the answers

    What are the advantages of oxyfuel cutting?

    <p>All of the above</p> Signup and view all the answers

    What is a limitation of oxyfuel cutting?

    <p>All of the above</p> Signup and view all the answers

    What is necessary for cutting materials like cast iron or stainless steel with oxyfuel cutting?

    <p>All of the above</p> Signup and view all the answers

    What can help alleviate the heat-affected zone issue in oxyfuel cutting?

    <p>Preheat and postheat</p> Signup and view all the answers

    What is the primary application of mechanized oxyfuel cutting?

    <p>Stack cutting</p> Signup and view all the answers

    What is a safety concern in oxyfuel cutting?

    <p>Flame and hot slag hazards</p> Signup and view all the answers

    What is the economic advantage of oxyfuel cutting compared to mechanical methods?

    <p>More economical for cutting steels</p> Signup and view all the answers

    What is the effect of specific chemical elements on oxyfuel cutting detailed in the text?

    <p>All of the above</p> Signup and view all the answers

    What is the primary advantage of mechanized oxyfuel cutting?

    <p>Efficiency</p> Signup and view all the answers

    What is the primary reason for the need for additional cleaning or grinding after oxyfuel cutting?

    <p>Oxidation products</p> Signup and view all the answers

    What affects cutting in stainless steels?

    <p>Molybdenum and chromium</p> Signup and view all the answers

    What affects the ease of cutting in alloys?

    <p>Tungsten</p> Signup and view all the answers

    Which element may improve rather than interfere with cutting in steel?

    <p>Vanadium</p> Signup and view all the answers

    What is the primary gas used in Air Carbon Arc Cutting (CAC-A)?

    <p>Compressed air</p> Signup and view all the answers

    What can the CAC-A process be used for?

    <p>Weld joint preparation, backgouging, and rough machining of large parts</p> Signup and view all the answers

    Which metals is Plasma Arc Cutting (PAC) suitable for cutting?

    <p>Nonferrous metals and carbon steels</p> Signup and view all the answers

    What is the primary difference between Air Carbon Arc Cutting (CAC-A) and Plasma Arc Cutting (PAC)?

    <p>The primary cutting gas used</p> Signup and view all the answers

    What is the primary application of Plasma Arc Cutting (PAC)?

    <p>Metal removal</p> Signup and view all the answers

    What is the primary advantage of Air Carbon Arc Cutting (CAC-A)?

    <p>Relatively efficient method for metal removal</p> Signup and view all the answers

    What affects the electrical requirements of Air Carbon Arc Cutting (CAC-A)?

    <p>Different metals and alloys</p> Signup and view all the answers

    What is the primary cutting gas used in Plasma Arc Cutting (PAC)?

    <p>Inert gas</p> Signup and view all the answers

    What is the primary limitation of Plasma Arc Cutting (PAC)?

    <p>Limited to thin materials</p> Signup and view all the answers

    What is the primary purpose of the preheat flame in oxyfuel cutting?

    <p>To heat the metal to its oxidation temperature</p> Signup and view all the answers

    Which gas can be used for oxyfuel cutting with different efficiencies and may require modified cutting tips?

    <p>Acetylene</p> Signup and view all the answers

    What are the advantages of oxyfuel cutting?

    <p>Relatively inexpensive and portable equipment</p> Signup and view all the answers

    What is a limitation of oxyfuel cutting?

    <p>Need for additional cleaning or grinding after cutting</p> Signup and view all the answers

    What is the effect of specific chemical elements on oxyfuel cutting detailed in the text?

    <p>Difficulty in cutting higher carbon steels</p> Signup and view all the answers

    How can the heat-affected zone issue in oxyfuel cutting be alleviated?

    <p>Preheat and postheat</p> Signup and view all the answers

    What is the primary application of mechanized oxyfuel cutting?

    <p>Stack cutting</p> Signup and view all the answers

    What is a safety hazard in oxyfuel cutting?

    <p>Flame and hot slag</p> Signup and view all the answers

    What material is oxyfuel cutting primarily used for?

    <p>Carbon and low alloy steels</p> Signup and view all the answers

    What are the criteria for material suitable for oxyfuel cutting?

    <p>Capability of burning in oxygen, lower ignition temperature than melting temperature</p> Signup and view all the answers

    What is the purpose of cutting oxygen in oxyfuel cutting?

    <p>To oxidize the hot metal</p> Signup and view all the answers

    What is the effect of alloying elements on oxyfuel cutting?

    <p>Summarized in Table 3.6</p> Signup and view all the answers

    What is the primary heating source in infrared brazing (IRB)?

    <p>Oxyfuel flame</p> Signup and view all the answers

    What is the primary limitation of brazing?

    <p>Need for extremely clean parts</p> Signup and view all the answers

    What is the primary cutting gas used in Plasma Arc Cutting (PAC)?

    <p>Argon</p> Signup and view all the answers

    What is the primary advantage of Air Carbon Arc Cutting (CAC-A)?

    <p>Ability to gouge, cut, and bevel</p> Signup and view all the answers

    What is the primary purpose of the preheat flame in oxyfuel cutting?

    <p>To heat the metal to its kindling temperature</p> Signup and view all the answers

    What is the primary application of mechanized oxyfuel cutting?

    <p>Large-scale metal fabrication</p> Signup and view all the answers

    What is the effect of high percentages of sulfur in steel during cutting?

    <p>Increased risk of hot cracking</p> Signup and view all the answers

    What is the primary advantage of mechanized oxyfuel cutting?

    <p>Faster cutting speed</p> Signup and view all the answers

    What is the effect of specific chemical elements on oxyfuel cutting detailed in the text?

    <p>Altered material properties</p> Signup and view all the answers

    What is the primary application of Plasma Arc Cutting (PAC)?

    <p>Industrial metal fabrication</p> Signup and view all the answers

    What is the primary limitation of oxyfuel cutting?

    <p>Slow cutting speed</p> Signup and view all the answers

    What is necessary for cutting materials like cast iron or stainless steel with oxyfuel cutting?

    <p>Preheating the material</p> Signup and view all the answers

    What is the primary advantage of brazing?

    <p>Joining dissimilar metals</p> Signup and view all the answers

    What is the primary limitation of brazing?

    <p>Need for extremely clean parts</p> Signup and view all the answers

    What is the primary heating source in dip brazing?

    <p>Molten bath</p> Signup and view all the answers

    What is the primary purpose of flux in brazing?

    <p>To prevent oxidation of base metals</p> Signup and view all the answers

    What is the primary purpose of the high pressure stream of cutting oxygen in oxyfuel gas cutting (OFC)?

    <p>To support the combustion of the metal</p> Signup and view all the answers

    What is the primary limitation of oxyfuel gas cutting (OFC)?

    <p>Need for extremely clean surfaces</p> Signup and view all the answers

    What is the primary application of brazing?

    <p>Aerospace industry</p> Signup and view all the answers

    What is the primary limitation of dip brazing?

    <p>Difficulty in controlling heating</p> Signup and view all the answers

    What is the primary purpose of flux in dip brazing?

    <p>To prevent oxidation of base metals</p> Signup and view all the answers

    What is the primary application of oxyfuel gas cutting (OFC)?

    <p>Metal fabrication</p> Signup and view all the answers

    What is the primary advantage of oxyfuel gas cutting (OFC)?

    <p>Low equipment cost</p> Signup and view all the answers

    What is the primary limitation of infrared brazing?

    <p>Limited to specific metal types</p> Signup and view all the answers

    Study Notes

    Brazing and Cutting Processes in Metal Joining

    • Brazing involves resistance heating to melt braze filler metal in the joint
    • Dip brazing immerses parts in a molten bath for heating
    • Infrared brazing uses radiant energy for heating
    • Brazing is used in aerospace and HVAC industries
    • Brazing can join virtually all metals and metals to nonmetals
    • Different fluxes are used for different base metals and applications
    • Problems with brazing include voids, erosion of base metal, and flux residue corrosion
    • Advantages of brazing include joining dissimilar metals and inexpensive equipment
    • Limitations of brazing include the need for extremely clean parts and sufficient joint surface area
    • Cutting processes are used in metal fabrication to remove metal or prepare joints
    • Oxyfuel gas cutting uses an oxyfuel flame to heat metal and produce an oxidation reaction
    • OFC equipment includes a special cutting tip with small holes for the cutting operation

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