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GTAW Electrodes Filler Metals and Shielding Gases
28問 • 1年前
  • Fern Hiebert
    • 通報

    問題一覧

  • 1

    A characteristic of tungsten is that:

    retains its hardness at red heat

  • 2

    Tungsten is classed as a ___________ metal, which means that it has a high melting point of ________________________.

    refractory, 3410°c (6170°f)

  • 3

    What type of electrode is used for the gas tungsten arc welding process?

    Non-Consumable

  • 4

    The advantage that a ground-finished electrode has over a chemically cleaned electrode is that it:

    has better electrical contact with the collet

  • 5

    The reason thoria is added to GTAW electrodes is to:

    increase current carrying capacity and Arc stability

  • 6

    An EWTh-1 electrode would be a good choice for welding:

    Mild steel

  • 7

    What would be a good current choice for a green coated electrode?

    ac with continuous high frequency on aluminum

  • 8

    State three methods that may be used to prepare an electrode for welding.

    electrical Arc, grinding, chemical sharpening

  • 9

    An EWTh-2 ground to a conical point is prepared correctly for welding on:

    stainless steel

  • 10

    What protects the electrode from atmospheric contamination?

    shielding gases

  • 11

    Oxidation of the electrode immediately after the arc is extinguished is prevented by:

    a post flow of the shielding gas

  • 12

    What is the primary consideration when selecting a filler rod?

    The primary consideration is the type of material so as to ensure the rod chemistry and mechanical properties match the required job specifications.

  • 13

    Which two filler metals can be used to weld most weldable aluminum alloys?

    ER4043 and ER5356

  • 14

    The AWS/csa filler metal classifications for GTAW of carbon steels may also be used for:

    GMAE

  • 15

    To prevent porosity during gtaw of rimmed steels filler rods must have:

    multiple deoxidizers

  • 16

    CSA filler metal specifications differ from AWS specifications in that tensile strength is expressed in:

    Megapascals

  • 17

    Which of the following aluminum filler rods has magnesium as its alloying element?

    ER5356

  • 18

    GTAW filler rods should be properly stored to prevent contamination from:

    moisture

  • 19

    What is the maximum allowable gap when joining the ends of a consumable insert?

    .8mm (1/32")

  • 20

    The gas shielding of the GTAW process:

    protects the electrode and the weld puddle from atmospheric contamination.

  • 21

    Which of the following gases is the heaviest in air?

    argon

  • 22

    Which of the following is a characteristic of argon shielding gas?

    smooth quite arc action

  • 23

    Which gas requires high flow rates?

    helium

  • 24

    When using GTAW on aluminum, changing from argon to a mixture of argon-helium results in:

    a much faster welding speed.

  • 25

    The shielding gas mixture argon-hydrogen is an advantage when welding:

    light wall stainless steel with automatic equipment.

  • 26

    The gas best suited for manual GTAW on carbon steels is:

    argon

  • 27

    When using GTAW on aluminum, what inert gas produces the most effective oxide removal?

    argon

  • 28

    Helium is used as a shielding gas on stainless steel when:

    maximum penetration is desired.

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    問題一覧

  • 1

    A characteristic of tungsten is that:

    retains its hardness at red heat

  • 2

    Tungsten is classed as a ___________ metal, which means that it has a high melting point of ________________________.

    refractory, 3410°c (6170°f)

  • 3

    What type of electrode is used for the gas tungsten arc welding process?

    Non-Consumable

  • 4

    The advantage that a ground-finished electrode has over a chemically cleaned electrode is that it:

    has better electrical contact with the collet

  • 5

    The reason thoria is added to GTAW electrodes is to:

    increase current carrying capacity and Arc stability

  • 6

    An EWTh-1 electrode would be a good choice for welding:

    Mild steel

  • 7

    What would be a good current choice for a green coated electrode?

    ac with continuous high frequency on aluminum

  • 8

    State three methods that may be used to prepare an electrode for welding.

    electrical Arc, grinding, chemical sharpening

  • 9

    An EWTh-2 ground to a conical point is prepared correctly for welding on:

    stainless steel

  • 10

    What protects the electrode from atmospheric contamination?

    shielding gases

  • 11

    Oxidation of the electrode immediately after the arc is extinguished is prevented by:

    a post flow of the shielding gas

  • 12

    What is the primary consideration when selecting a filler rod?

    The primary consideration is the type of material so as to ensure the rod chemistry and mechanical properties match the required job specifications.

  • 13

    Which two filler metals can be used to weld most weldable aluminum alloys?

    ER4043 and ER5356

  • 14

    The AWS/csa filler metal classifications for GTAW of carbon steels may also be used for:

    GMAE

  • 15

    To prevent porosity during gtaw of rimmed steels filler rods must have:

    multiple deoxidizers

  • 16

    CSA filler metal specifications differ from AWS specifications in that tensile strength is expressed in:

    Megapascals

  • 17

    Which of the following aluminum filler rods has magnesium as its alloying element?

    ER5356

  • 18

    GTAW filler rods should be properly stored to prevent contamination from:

    moisture

  • 19

    What is the maximum allowable gap when joining the ends of a consumable insert?

    .8mm (1/32")

  • 20

    The gas shielding of the GTAW process:

    protects the electrode and the weld puddle from atmospheric contamination.

  • 21

    Which of the following gases is the heaviest in air?

    argon

  • 22

    Which of the following is a characteristic of argon shielding gas?

    smooth quite arc action

  • 23

    Which gas requires high flow rates?

    helium

  • 24

    When using GTAW on aluminum, changing from argon to a mixture of argon-helium results in:

    a much faster welding speed.

  • 25

    The shielding gas mixture argon-hydrogen is an advantage when welding:

    light wall stainless steel with automatic equipment.

  • 26

    The gas best suited for manual GTAW on carbon steels is:

    argon

  • 27

    When using GTAW on aluminum, what inert gas produces the most effective oxide removal?

    argon

  • 28

    Helium is used as a shielding gas on stainless steel when:

    maximum penetration is desired.