WIT-08
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Questions and Answers

What does the designation 'A' indicate in the context of heat treatment?

  • Medium manganese content
  • Postweld heat treated condition
  • As-welded condition (correct)
  • Low manganese content
  • What does the designation 'EC' indicate in the classification of electrodes?

  • Flux trade name
  • High manganese content
  • Composite electrode (correct)
  • Solid electrode
  • What does the designation 'F7A6-EM12K' refer to?

  • High impact strength electrode
  • Medium manganese content electrode
  • Flux and electrode combination for specific weld properties (correct)
  • Low tensile strength flux
  • What does the designation '20 ft·lb [27J]' represent in the context of weld metal impact strength?

    <p>Minimum impact strength</p> Signup and view all the answers

    What should be done to a cylinder when transported to prevent it from turning into a lethal missile?

    <p>Remove the regulators and cover the valves with special screw-on caps</p> Signup and view all the answers

    What type of heat source does oxyacetylene welding (OAW) provide?

    <p>Less concentrated heat source compared to an arc</p> Signup and view all the answers

    What type of joint preparation is recommended for making a groove weld using OAW?

    <p>Exhibit a thin 'feather edge'</p> Signup and view all the answers

    What type of welding is OAW best suited for?

    <p>Thin section welding</p> Signup and view all the answers

    What skill level is required for oxyacetylene welding (OAW) to achieve best results?

    <p>Substantial skill level</p> Signup and view all the answers

    What problems are primarily associated with oxyacetylene welding (OAW)?

    <p>Improper manipulation or adjustment of the flame</p> Signup and view all the answers

    What is the mixing section of the torch used for in oxyacetylene welding (OAW)?

    <p>To combine oxygen and acetylene to provide the necessary mixture</p> Signup and view all the answers

    What type of flame is recommended for carbon steel welding using oxyacetylene welding (OAW)?

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

    What is the tensile strength of weld metal produced by Submerged Arc Welding (SAW)?

    <p>70,000 psi</p> Signup and view all the answers

    What is the Charpy V-notch requirement for weld metal produced by SAW at –40°F?

    <p>20 ft·lb</p> Signup and view all the answers

    What is a characteristic of Submerged Arc Welding (SAW) regarding smoke generation?

    <p>Low smoke generation</p> Signup and view all the answers

    What is a limitation of Submerged Arc Welding (SAW) in terms of welding positions?

    <p>Can only be done in positions where flux can be supported</p> Signup and view all the answers

    What is a requirement for finished welds produced by Submerged Arc Welding (SAW)?

    <p>They have a layer of solidified slag that must be removed</p> Signup and view all the answers

    What is a benefit of Submerged Arc Welding (SAW) in terms of material surfaces?

    <p>It provides improved corrosion or wear resistance</p> Signup and view all the answers

    What is a characteristic of the operator appeal of Submerged Arc Welding (SAW)?

    <p>Lack of visible arc and less smoke generation</p> Signup and view all the answers

    What is the method used by semiautomatic Submerged Arc Welding (SAW) to deliver flux to the welding gun?

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

    What type of electrode is used in Plasma Arc Welding (PAW) to create an intense plasma region?

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

    How does the intensity of the plasma region in Plasma Arc Welding (PAW) compare to Gas Tungsten Arc Welding (GTAW)?

    <p>PAW has a more intense plasma region</p> Signup and view all the answers

    What is a similarity between Plasma Arc Welding (PAW) and Gas Tungsten Arc Welding (GTAW)?

    <p>Type of power source used</p> Signup and view all the answers

    What is a characteristic of mechanized systems in Submerged Arc Welding (SAW)?

    <p>They distribute flux ahead of the arc</p> Signup and view all the answers

    What is the primary limitation of Electroslag Welding (ESW)?

    <p>Extensive time required for setup</p> Signup and view all the answers

    What problem may occur if the current levels are too high in Electroslag Welding?

    <p>Copper orifice melting</p> Signup and view all the answers

    What is the primary advantage of Electroslag Welding (ESW)?

    <p>High deposition rate</p> Signup and view all the answers

    What is the primary function of acetylene in oxyacetylene welding?

    <p>Fuel for high-temperature welding</p> Signup and view all the answers

    What type of welding method is oxyacetylene welding considered to be?

    <p>Chemical welding method</p> Signup and view all the answers

    What is the primary advantage of oxyacetylene welding?

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

    What is the purpose of the pressure regulators in oxyacetylene welding equipment?

    <p>To reduce high internal tank pressure to working pressure</p> Signup and view all the answers

    What is the primary disadvantage of oxyacetylene welding?

    <p>Limited application for thinner sections</p> Signup and view all the answers

    What does the identification 'RG-45' signify in oxyacetylene welding?

    <p>Minimum tensile strength of the weld deposit</p> Signup and view all the answers

    What is the primary advantage of using metal strip instead of wire in Electroslag Welding?

    <p>Increased deposition rate</p> Signup and view all the answers

    What problem may occur due to the presence of a leak in one of the water-cooled shoes in Electroslag Welding?

    <p>Gross porosity</p> Signup and view all the answers

    What is the primary task of oxyacetylene welding?

    <p>Welding thin steel sheet and small diameter steel piping</p> Signup and view all the answers

    What is the primary fuel gas used in oxyacetylene welding (OAW)?

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

    Which welding process has the highest deposition rate among welding processes?

    <p>Electroslag welding (ESW)</p> Signup and view all the answers

    What is the major advantage of Electroslag welding (ESW)?

    <p>High deposition rate</p> Signup and view all the answers

    What is the primary advantage of Oxyacetylene welding (OAW)?

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

    What is a potential problem associated with Electroslag welding (ESW)?

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

    What type of material is Oxyacetylene welding (OAW) used for welding?

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

    What is a characteristic of Oxyacetylene welding (OAW) equipment?

    <p>Consists of oxygen and acetylene tanks</p> Signup and view all the answers

    What problem is associated with Oxyacetylene welding (OAW)?

    <p>Gross porosity</p> Signup and view all the answers

    What is the primary limitation of Electroslag welding (ESW)?

    <p>Uneconomical for thinner sections</p> Signup and view all the answers

    What type of welding method is Oxyacetylene welding (OAW) considered to be?

    <p>Chemical welding</p> Signup and view all the answers

    What is the filler material used for Oxyacetylene welding (OAW) primarily used for?

    <p>Welding thin steel sheet</p> Signup and view all the answers

    What is the primary problem associated with Electroslag welding (ESW) in terms of setup?

    <p>Excessive time required for setup</p> Signup and view all the answers

    Study Notes

    Submerged Arc Welding and Plasma Arc Welding Processes

    • Submerged Arc Welding (SAW) produces weld metal with a tensile strength of at least 70,000 psi and Charpy V-notch of at least 20 ft·lb at –40°F
    • SAW has high deposition rate, less smoke generation, and deep penetration ability but can only be done in positions where flux can be supported
    • SAW requires extensive fixturing and positioning equipment, and finished welds have a layer of solidified slag that must be removed
    • The process has inherent problems related to granular flux, welding current choice, and solidification cracking
    • SAW is beneficial for overlaying or building up material surfaces, providing improved corrosion or wear resistance
    • SAW process has high operator appeal due to lack of visible arc and less smoke generation
    • The flux in SAW prevents the welder from seeing the arc's position, requiring tracking of the joint without the arc or the flux
    • Semiautomatic SAW uses compressed air to force the flux to the gun, while mechanized systems distribute the flux ahead of the arc or around the arc from a nozzle
    • Plasma Arc Welding (PAW) creates an intense plasma region using a tungsten electrode and a copper orifice within the ceramic nozzle
    • PAW is similar to Gas Tungsten Arc Welding (GTAW) in equipment but differs in the intensity of the plasma region
    • Both PAW and GTAW use the same type of power source and shielding gas
    • PAW has a more concentrated and intense arc compared to GTAW due to the constriction of the arc caused by the plasma gas forced through the orifice

    Welding Processes Overview

    • Electroslag welding (ESW) is primarily used by industries dealing with heavy weldments and has the highest deposition rate among welding processes.
    • ESW can encounter problems such as tungsten inclusions from high current levels and tunneling from incomplete filling of the keyhole.
    • ESW may lead to centerline cracks due to weld metal shrinkage and grain growth in the weld metal due to high heating.
    • Oxyacetylene welding (OAW) uses acetylene as the only fuel gas capable of producing high temperatures for effective welding of steel.
    • OAW does not require external shielding or flux and is considered a chemical welding method.
    • OAW equipment consists of oxygen and acetylene tanks, pressure regulators, torch, and connecting hoses.
    • The major advantage of ESW is its high deposition rate, and it does not require special joint preparation.
    • ESW setup time and effort required for positioning workpieces and guides make it uneconomical for thinner sections despite its high deposition rate.
    • ESW problems include gross porosity, detachment of tips, and extensive time required for setup.
    • OAW filler material has a simple identification system, and it is used for welding thin steel sheet, small diameter steel piping, and maintenance situations.
    • OAW advantages include its relative inexpensiveness, portability, and lack of electrical input requirement.
    • Care should be taken when moving OAW equipment to prevent damage to the primary valves on the cylinders.

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    Description

    Test your knowledge of welding processes with this quiz. Explore submerged arc welding (SAW) and plasma arc welding (PAW) processes, as well as an overview of electroslag welding (ESW) and oxyacetylene welding (OAW). Learn about their characteristics, advantages, equipment, and common issues.

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