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?

Furnace brazing (FB) Signup and view all the answers

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

Porosity and cracking may result Signup and view all the answers

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

Grinding Signup and view all the answers

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

Misapplication may degrade final weld quality Signup and view all the answers

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

Parts are immersed in a molten bath for heating Signup and view all the answers

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

Radiant energy Signup and view all the answers

What is a limitation of brazing?

Parts must be extremely clean prior to brazing Signup and view all the answers

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

About 1700°F [925°C] Signup and view all the answers

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

To produce an oxidation reaction and remove slag and oxide residue Signup and view all the answers

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

Cutting attachment with a special cutting tip Signup and view all the answers

What is the purpose of dip brazing (DB)?

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

What is a concern regarding the base metal in brazing?

Corrosion by some of the extremely reactive fluxes Signup and view all the answers

What is a significant advantage of brazing?

Ability to join dissimilar metals Signup and view all the answers

What is the primary limitation of brazing?

Parts must be extremely clean prior to brazing Signup and view all the answers

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

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

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

To produce an oxidation reaction and remove slag and oxide residue Signup and view all the answers

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

It is inherently a very noisy and dirty process. Signup and view all the answers

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

Phosphorus Signup and view all the answers

What is the effect of aluminum in steel?

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

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

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

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

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

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

It has no effect. Signup and view all the answers

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

It may improve rather than interfere with cutting. Signup and view all the answers

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

They may be cut only by special techniques. Signup and view all the answers

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

They can be cut very readily. Signup and view all the answers

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

It affects cutting about the same as chromium. Signup and view all the answers

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

It offers no difficulties. Signup and view all the answers

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

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

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

Acetylene Signup and view all the answers

What is the primary material for oxyfuel cutting?

Carbon and low alloy steels Signup and view all the answers

What are the advantages of oxyfuel cutting?

All of the above Signup and view all the answers

What is a limitation of oxyfuel cutting?

All of the above Signup and view all the answers

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

All of the above Signup and view all the answers

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

Preheat and postheat Signup and view all the answers

What is the primary application of mechanized oxyfuel cutting?

Stack cutting Signup and view all the answers

What is a safety concern in oxyfuel cutting?

Flame and hot slag hazards Signup and view all the answers

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

More economical for cutting steels Signup and view all the answers

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

All of the above Signup and view all the answers

What is the primary advantage of mechanized oxyfuel cutting?

Efficiency Signup and view all the answers

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

Oxidation products Signup and view all the answers

What affects cutting in stainless steels?

Molybdenum and chromium Signup and view all the answers

What affects the ease of cutting in alloys?

Tungsten Signup and view all the answers

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

Vanadium Signup and view all the answers

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

Compressed air Signup and view all the answers

What can the CAC-A process be used for?

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

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

Nonferrous metals and carbon steels Signup and view all the answers

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

The primary cutting gas used Signup and view all the answers

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

Metal removal Signup and view all the answers

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

Relatively efficient method for metal removal Signup and view all the answers

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

Different metals and alloys Signup and view all the answers

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

Inert gas Signup and view all the answers

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

Limited to thin materials Signup and view all the answers

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

To heat the metal to its oxidation temperature Signup and view all the answers

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

Acetylene Signup and view all the answers

What are the advantages of oxyfuel cutting?

Relatively inexpensive and portable equipment Signup and view all the answers

What is a limitation of oxyfuel cutting?

Need for additional cleaning or grinding after cutting Signup and view all the answers

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

Difficulty in cutting higher carbon steels Signup and view all the answers

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

Preheat and postheat Signup and view all the answers

What is the primary application of mechanized oxyfuel cutting?

Stack cutting Signup and view all the answers

What is a safety hazard in oxyfuel cutting?

Flame and hot slag Signup and view all the answers

What material is oxyfuel cutting primarily used for?

Carbon and low alloy steels Signup and view all the answers

What are the criteria for material suitable for oxyfuel cutting?

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

What is the purpose of cutting oxygen in oxyfuel cutting?

To oxidize the hot metal Signup and view all the answers

What is the effect of alloying elements on oxyfuel cutting?

Summarized in Table 3.6 Signup and view all the answers

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

Oxyfuel flame Signup and view all the answers

What is the primary limitation of brazing?

Need for extremely clean parts Signup and view all the answers

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

Argon Signup and view all the answers

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

Ability to gouge, cut, and bevel Signup and view all the answers

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

To heat the metal to its kindling temperature Signup and view all the answers

What is the primary application of mechanized oxyfuel cutting?

Large-scale metal fabrication Signup and view all the answers

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

Increased risk of hot cracking Signup and view all the answers

What is the primary advantage of mechanized oxyfuel cutting?

Faster cutting speed Signup and view all the answers

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

Altered material properties Signup and view all the answers

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

Industrial metal fabrication Signup and view all the answers

What is the primary limitation of oxyfuel cutting?

Slow cutting speed Signup and view all the answers

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

Preheating the material Signup and view all the answers

What is the primary advantage of brazing?

Joining dissimilar metals Signup and view all the answers

What is the primary limitation of brazing?

Need for extremely clean parts Signup and view all the answers

What is the primary heating source in dip brazing?

Molten bath Signup and view all the answers

What is the primary purpose of flux in brazing?

To prevent oxidation of base metals Signup and view all the answers

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

To support the combustion of the metal Signup and view all the answers

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

Need for extremely clean surfaces Signup and view all the answers

What is the primary application of brazing?

Aerospace industry Signup and view all the answers

What is the primary limitation of dip brazing?

Difficulty in controlling heating Signup and view all the answers

What is the primary purpose of flux in dip brazing?

To prevent oxidation of base metals Signup and view all the answers

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

Metal fabrication Signup and view all the answers

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

Low equipment cost Signup and view all the answers

What is the primary limitation of infrared brazing?

Limited to specific metal types 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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