2021 welder (primary) examination skills and welder (primary) operation examination question bank

Source of question bank ： Safety production simulation test, a little public official account.

Pass the safety production simulation exam at one point ： Welder （ primary ） Examination skills reference answers and welders （ primary ） The analysis of examination questions is a general question bank for safety production simulation examination. Teachers and welders （ primary ） Summary of trainees who have passed the operation certificate , Relatively effective in helping welders （ primary ） Homework exam question bank students successfully passed the exam .

1、【 Single topic selection 】 It is known that the secondary side voltage of the power transformer is 20 v , Single phase bridge rectifier circuit is adopted now , Then... Can be obtained on the load () Voltage .（  C  ）

A、10

B、9

C、18

D、20

2、【 Single topic selection 】 One resistor is connected to the internal resistance of 0.1Ω、 The electromotive force is 1.5V When on the power supply , The current flowing through the resistor is 1A, Then the voltage on the resistor is equal to ()V.（  B  ）

A、1

B、1.4

C、1.5

D、0.1

3、【 Single topic selection 】 During pipeline wiring , The thicker the aluminum core wire is , Safe current carrying capacity per unit area ().（  B  ）

A、 The bigger it is

B、 The smaller it is

C、 unchanged

D、 constant

4、【 Single topic selection 】 When electricity flows continuously through a section of conductor with uneven thickness , The current intensity on each cross section of the conductor ().（  C  ）

A、 Directly proportional to the cross-sectional area

B、 Inversely proportional to the cross-sectional area

C、 Independent of the cross-sectional area

D、 With the change of cross-sectional area

5、【 Single topic selection 】 The circuits of ceiling fans and floor fans are generally controlled by switches 、 governor 、() And motor winding .（  C  ）

A、 resistor

B、 Buzzer

C、 Capacitor

D、 Inductor

6、【 Single topic selection 】 The width of vehicle passage in the welding work area shall not be less than (), The pedestrian passage shall not be less than 1.5m.（  B  ）

A、1m

B、3m

C、2m

D、4m

7、【 Single topic selection 】 The following () It is not a physical harmful factor produced in the welding process .（  C  ）

A、 Welding arc

B、 Thermal radiation

C、 Welding fume

D、 Radiation

8、【 Single topic selection 】 The joint where the end faces of two weldments are relatively parallel is called ().（  A  ）

A、 Butt joint

B、 Corner joint

C、 Termination joint

D、 Lap joint

9、【 Single topic selection 】 According to the deoxidizer added in the flux 、 Alloy flux can be divided into neutral flux 、 Active flux and ().（  C  ）

A、 Bonding flux

B、 Sintered flux

C、 Alloy flux

D、 High manganese flux

10、【 Single topic selection 】 Letters in the category name of arc welding power source models B Express ().（  B  ）

A、 Inverter power supply

B、 Arc welding transformer

C、 Arc welding rectifier

D、 Arc welding engine

11、【 Single topic selection 】 Gas metal arc welding , Solid core aluminum and aluminum alloy welding wires shall comply with national standards () Relevant provisions in the standard .（  C  ）

A、GB/T8110

B、GB/T9460

C、GB/T10858

D、GB/T5118

12、【 Single topic selection 】 In the dimensions of the assembly drawing , There is no need to mark ().（  B  ）

A、 Fit dimensions

B、 All dimensions of all parts

C、 Dimensions

D、 Selected dimensions in the design

13、【 Single topic selection 】 The commonly used model is SalSi-1 The brand of aluminum alloy welding wire is ().（  B  ）

A、HS301

B、HS311

C、HS321

D、HS331

14、【 Single topic selection 】() The source of is the oxidation of high-temperature steam produced by metallic and non-metallic substances under superheated conditions 、 Formed by condensation .（  C  ）

A、 Splash metal

B、 Radiation

C、 Welding fume

D、 Welding arc

15、【 Single topic selection 】 After the low carbon steel is grooved by carbon arc air gouging or the root of pick welding , There is a hardened layer on the surface of the planer , Increase or decrease with the change of process parameters , But not deeper than .（  D  ）

A、2mm

B、3mm

C、4mm

D、1mm

16、【 Single topic selection 】 When carbon arc gouging , The arc length is too short to cause arc extinction .（  C  ）

A、 The groove is too narrow

B、 The groove is too wide

C、 Carbon inclusion

D、 Arc instability ）

17、【 Single topic selection 】 Welding workers should study hard , Study professional knowledge seriously , Attaches great importance to (), Strive to improve the quality of workers .（  A  ）

A、 Post skill training

B、 Interpersonal communication

C、 Improve management quality

D、 Welding quality

18、【 Single topic selection 】 Ultrasonic wave means that the frequency exceeds () The mechanical wave of .（  A  ）

A、20000Hz

B、2000Hz

C、10000Hz

D、30000Hz

19、【 Single topic selection 】 During arc striking of carbon arc gouging , The main reason for carbon inclusion is （  A  ）

A、 First ignite the arc , Rear air supply

B、 Excessive arc striking current

C、 The extension length of carbon rod is too short

D、 The pilot arc is too short

20、【 Single topic selection 】 At present, the pressure reducer often used on oxygen cylinders is QD-1 Type pressure reducer .（  A  ）

A、 Single stage reaction

B、 Two stage reaction

C、 Positive action

D、 Reaction

21、【 Single topic selection 】 In order to prevent hot cracks , Sulfur is required when welding high alloy steel 、 The mass fraction of phosphorus must be limited to ().（  C  ）

A、0.01％ following

B、0.02％ following

C、0.03％ following

D、0.04％ following

22、【 Single topic selection 】 The symbol for tensile strength is ().（  D  ）

A、σs

B、σ0.2

C、σk

D、σb

23、【 Single topic selection 】 Gas metal arc welding , use Ar As a shielding gas , Can be welded ().（  D  ）

A、 Carbon steel 、 Low alloy steel

B、 Stainless steel 、 aluminum 、 copper

C、 Titanium 、 nickel

D、 All metal materials

24、【 Single topic selection 】 Technical standards for electric welding machines , Design of electrode arc welding power source () by 60%.（  C  ）

A、 The work efficiency

B、 Deposition rate

C、 Rated load duration

D、 Usage rate

25、【 Single topic selection 】 When the tube plate is welded by riding , The convexity and concavity of welding leg shall not be greater than ().（  B  ）

A、1mm

B、1.5mm

C、2mm

D、2.5mm

26、【 Single topic selection 】 When welding copper , The solvent used is ：（  C  ）

A、CJ101

B、CJ201

C、CJ301

D、CJ401

27、【 Single topic selection 】 Melting pole CO2 Gas shielded welding , When welding flat butt joints of thin plates , Adopt rigid fixation method , Can effectively control ().（  D  ）

A、 Workpiece size

B、 Joint strength

C、 Welding stress

D、 Welding deformation

28、【 Single topic selection 】 Gas metal arc welding , The extension length of welding wire is related to the material of welding wire 、 Welding voltage 、 Wire diameter and () of .（  D  ）

A、 Transition form

B、 Nozzle aperture

C、 Gas flow

D、 Welding current

29、【 Single topic selection 】 When stud welding is used to weld aluminum and its alloys , Should use ().（  B  ）

A、 DC positive connection

B、 DC reverse connection

C、 communication

D、 Direct current forward connection or reverse connection

30、【 Single topic selection 】 Love and dedication is to advocate () The spirit of .（  C  ）

A、 Selfless dedication

B、 The supremacy of collective interests

C、 Do a good job , Love one line

D、 Distinguish between public and private

31、【 Single topic selection 】 Gas metal arc welding , Single side welding and double side forming welding , The welding process parameters of the filling layer are better than that of the sealing layer, and... Shall be selected ().（  C  ）

A、 high voltage 、 High current

B、 Low voltage 、 Low current

C、 Low voltage 、 High current

D、 high voltage 、 Low current

32、【 Single topic selection 】 Gas metal arc welding , Coarse drop transition is suitable for () The welding of .（  D  ）

A、 Position of horizontal rotation of thick wall large diameter pipe

B、 Horizontal fixed position of thick wall large diameter pipe

C、 Flat welding position of medium plate

D、 Flat welding position of thin plate

33、【 Single topic selection 】 An atom consists of a central nucleus and () Composed of .（  B  ）

A、 The proton

B、 Extranuclear electrons

C、 neutron

D、 ion

34、【 Single topic selection 】 The main factors affecting the width of cold work hardening zone are ： Mechanical properties of steel ;(); The sharpness of the scissors ; The gap between the upper and lower scissors ; Diagonal angle of upper scissors .（  B  ）

A、 The width of the steel

B、 Thickness of steel

C、 Thermal expansion of steel

D、 Density of steel

35、【 Single topic selection 】 Before welding work , The equipment shall be subject to safety inspection , However, it does not belong to the welder's safety inspection of equipment .（  A  ）

A、 Whether the internal insulation resistance of the electric welding machine meets the requirements

B、 Whether the insulation between the primary power line of the electric welding machine and the welding cable is intact

C、 Whether the protective grounding or neutral connection of the shell of the electric welding machine is reliable

D、 Whether the welding tongs are placed on the parts to be welded

36、【 Single topic selection 】 Weld under other same conditions () The diameter of the electrode used is larger than that of other positions .（  A  ）

A、 Flat fillet weld

B、 Vertical fillet weld

C、 Transverse fillet weld

D、 Elevation weld

37、【 Single topic selection 】 Gas welding 、 Check the environment around the work site before gas cutting , Stay away from the fire 、 Explosive items () Meters away .（  D  ）

A、2

B、3

C、4

D、5

38、【 Single topic selection 】 Command and control activities in terms of quality , It usually includes the formulation of quality policy and () And quality planning 、 The quality control 、 Quality assurance and quality improvement .（  C  ）

A、 Quality evaluation

B、 Quality testing

C、 Quality objectives

D、 Quality realization

39、【 Single topic selection 】 During gas welding and gas cutting , Air leakage at the switch or welding nozzle , The main reason is （  C  ）

A、 The welding nozzle is worn

B、 Welding time is too long

C、 The welding gun is blocked

D、 The welding nozzle is not tightened

40、【 Single topic selection 】 The shape of the working surface of the seam welding electrode includes plane and () Two kinds of .（  A  ）

A、 sphere

B、 Arc surface

C、 Surfaces

D、 circular

41、【 Single topic selection 】 The temperature of medium flame is ：（  C  ）

A、2700〜3600°C

B、2700〜3000°C

C、3050〜3150°C

D、4500〜5001°C

42、【 Single topic selection 】 During gas metal arc welding , The main function of ceramic liner is (), Control forming .（  B  ）

A、 Reduce temperature

B、 Prevent welding penetration

C、 Prevent impervious

D、 Prevent oxidation

43、【 Single topic selection 】 Arc welding is produced by conducting electricity with gas () As a heat source .（  B  ）

A、 Current heat

B、 Arc heat

C、 Resistance heat

D、 pressure

44、【 Single topic selection 】 The unit of voltage is volts , Use symbols () Express .（  C  ）

A、C

B、A

C、V

D、F

45、【 Single topic selection 】 The contract law of the people's Republic of China was promulgated on () year .（  D  ）

A、1994

B、1996

C、1998

D、1999

46、【 Single topic selection 】 Arc stud welding is to ignite the arc between the stud to be welded and the workpiece , When the stud and workpiece are heated to the appropriate temperature , stay () Under action , The stud is fed into the welding pool on the workpiece to form a welded joint .（  D  ）

A、 temperature

B、 electric current

C、 voltage

D、 pressure

47、【 Single topic selection 】 The welding die is used to hold and clamp the workpiece in place , Also used as ().（  A  ）

A、 electrode

B、 fixture

C、 conductor

D、 Electrodes and wires

48、【 Single topic selection 】 Right welding method , Welding wire and torch are from the weld , This method of operation is called right welding .（  A  ）

A、 Move the left end to the right end , The welding wire is behind the welding torch , The flame points to the welded part of the weldment metal

B、 Move the left end to the right end , The welding wire is in front of the welding torch , The flame points to the part of the weldment metal to be welded

C、 Move the right end to the left end , The welding wire is behind the welding torch , The flame points to the part of the weldment metal to be welded

D、 Move the right end to the left end , The welding wire is in front of the welding torch , The flame points to the welded part of the weldment metal

49、【 Single topic selection 】 use G01-100 Cutting torch cutting 50mm Workpiece time , The oxygen pressure should be chosen to be ：（  B  ）

A、0.20MPa

B、0.50MPa

C、0.30MPa

D、0.35MPa

50、【 Single topic selection 】 Chemical equation xFe2O3+yCO=zFe+qCO2↑, among x、y、z、q In turn, is ().（  A  ）

A、1、3、2、3

B、1、2、3、3

C、2、1、3、3、

D、3、1、2、3

51、【 Single topic selection 】 The focus of personal protective measures for welding operation is to do a good job in the construction of welding workplace () And personal protection of welders .（  A  ）

A、 Ventilation and dust removal

B、 Environmental Health

C、 Process flow

D、 Equipment layout

52、【 Single topic selection 】 If the weld and the arrow line are not on the same side of the joint , Then mark the basic symbol of the weld on the... Of the datum line ().（  C  ）

A、 Solid line side

B、 Upper side

C、 Dotted line side

D、 On the same side

53、【 Single topic selection 】 Heat the metal to a certain temperature , And keep it for a certain time , The process of cooling to room temperature at a certain cooling rate is called ().（  D  ）

A、 quench

B、 Quenching and tempering

C、 Anneal

D、 heat treatment

54、【 Single topic selection 】 The tooth pattern code of ordinary thread and trapezoidal thread is ().（  B  ）

A、Tr、、B

B、M、Tr

C、M、B

D、Φ、M

55、【 Single topic selection 】 Among the commonly used welding methods, the welding method code of manual arc welding is ().（  A  ）

A、111

B、1

C、12

D、22

56、【 Single topic selection 】 Welding is by heating or pressurizing , Or both , And with or without filler material , A processing method that enables the workpiece to achieve .（  B  ）

A、 Connect

B、 combination

C、 whole

D、 melt

57、【 Single topic selection 】 The impact toughness of a material is related to the temperature of its environment , The lower the temperature , Its impact toughness value ().（  B  ）

A、 The bigger it is

B、 The smaller it is

C、 unchanged

D、 Not sure

58、【 Single topic selection 】 The current regulation of silicon arc welding rectifier power supply is regulated by .（  B  ）

A、 Three phase step-down transformer

B、 Magnetic saturation reactor

C、 Rectifier set

D、 Output reactor

59、【 Single topic selection 】 Morality is a kind of (), It is the criterion and norm for people to live together and their behavior .（  B  ）

A、 Social behavior

B、 Social ideology

C、 Production relationship behavior

D、 Self knowledge

60、【 Single topic selection 】 The following () It is a measure to reduce welding stress .（  A  ）

A、 Adopt reasonable welding sequence

B、 Use larger welding line energy

C、 Flame method

D、 Heat treatment

61、【 Single topic selection 】 The projection law of three views is equal in width .（  D  ）

A、 Front view and left view

B、 Front view and top view

C、 Front view and right view

D、 Top view and left view

62、【 Single topic selection 】 There are many harmful factors that will pollute the environment in the welding process , The following factors that are not physically harmful are （  D  ）

A、 Radiation

B、 Welding arc

C、 Thermal radiation

D、 Harmful gases

63、【 Single topic selection 】 When spot welding , The methods to prevent nugget offset are ： Adopt strong specifications 、 Use different electrode materials 、 Electrodes and electrodes with different contact surface diameters are used ().（  A  ）

A、 Adopt process gasket method

B、 Use low voltage

C、 Use high current

D、 Adopt preheating method

64、【 Judgment questions 】() In case of electrical failure of submerged arc welding machine , The welder shall cut off the power supply immediately , Even if the electrician is notified to repair .（  √  ）

65、【 Judgment questions 】 Arc static characteristics can be divided into three sections . When the current density is high , As the current increases , The arc voltage rises , This section is the rising characteristic area .（  √  ）

66、【 Judgment questions 】()HS311 It's copper alloy welding wire .（  ×  ）

67、【 Judgment questions 】 Magnetic bias blowing is directly related to the current , In order to reduce magnetic bias blowing , The welding current can be appropriately reduced .（  √  ）

68、【 Judgment questions 】() Gas metal arc welding , The welding equipment does not need to ensure that , Stable flow of shielding gas .（  ×  ）

69、【 Judgment questions 】()《 Special equipment operator certificate 》 Review once a year .（  ×  ）

70、【 Judgment questions 】 Anode spots are formed by the impact of anions on the anode surface .（  ×  ）

71、【 Judgment questions 】() Spot welding process parameters do not include weldment thickness , Nor does it include the sequence of spot welding .（  √  ）

72、【 Judgment questions 】() Product quality is an important basis for enterprises to survive in the market economy .（  ×  ）

73、【 Judgment questions 】() Innovation is the key factor for personal career success .（  √  ）

74、【 Judgment questions 】() In the process of repairing defects of welded structural parts , In general , The number of repair welding at the same position shall not exceed three times .（  √  ）

75、【 Judgment questions 】 Weld bead is a defect that the weld size does not meet the requirements .（  ×  ）

76、【 Judgment questions 】() When carbon arc gouging , As long as it is a carbon rod with copper sheet .（  ×  ）

77、【 Judgment questions 】() Reasonable formulation of drug skin ingredients , During welding, it can also improve the deslagging property of slag and reduce the amount of dust .（  √  ）

78、【 Judgment questions 】() Welding workers only need to do a good job of welding , Ignore other work .（  ×  ）

79、【 Judgment questions 】 Add potassium to the electrode coating 、 Na 、 Calcium and other elements are conducive to arc generation and stable combustion .（  √  ）

80、【 Judgment questions 】 In the electrode material 、 When the gas medium and arc length are certain , When the arc burns stably , The relationship between welding current and arc voltage is called the volt ampere characteristic of welding arc .（  √  ）

81、【 Judgment questions 】() The basic symbol of weld is the symbol that represents the shape characteristics of weld surface .（  ×  ）

82、【 Judgment questions 】 Adhere to civilized production , Create a comfortable living environment , It is one of the contents of welder's professional code .（  ×  ）

83、【 Judgment questions 】 The end connected to the positive pole of the power supply is called the anode area , The end connected with the negative electrode is called the cathode area , The part between the anode area and the cathode area is called the arc column area .（  √  ）

84、【 Judgment questions 】() Double line drawing is a projection drawing showing only the outer contour of pipes and fittings .（  √  ）

85、【 Judgment questions 】() Professional ethics is a mandatory restraint mechanism .（  ×  ）

86、【 Judgment questions 】 When using a digital multimeter , It is forbidden to turn the selector switch when measuring large voltage or current , To prevent electric arc from burning the switch ()（  √  ）

87、【 Judgment questions 】() When the power capacity is less than 100kvA when , The grounding resistance of the grounding protection line shall not exceed 10Ω that will do .（  √  ）

88、【 Judgment questions 】 A square is a measuring tool for measuring right angles , It is also a guiding tool for drawing parallel lines and vertical lines .()（  ×  ）

89、【 Judgment questions 】() The symbol of Zener diode is the same as that of ordinary diode .（  ×  ）

90、【 Judgment questions 】 In the voltage stabilizing circuit of silicon voltage stabilizing tube , The voltage stabilizing tube must be connected in series with the load .()（  ×  ）

91、【 Judgment questions 】 The iron loss of transformer is constant during operation .()（  √  ）

92、【 Judgment questions 】() The pipes used by electricians can be divided into steel pipes and copper pipes .（  ×  ）

93、【 Judgment questions 】() The metal parts of all non-conductive parts of metal trunking shall be connected and bridged with each other , Make it a continuous conductor , And complete the overall grounding .（  √  ）

94、【 Judgment questions 】 After the multimeter is used , The change-over switch can be placed in any position .()（  ×  ）

95、【 Judgment questions 】() The purpose of stator series resistance starting of three-phase asynchronous motor is to reduce the starting current .（  √  ）

96、【 Judgment questions 】() When the three-phase load is connected in a triangle , The measured current values of the three phases are equal , Then the three-phase load is symmetrical load .（  ×  ）

97、【 Judgment questions 】() stay 35KV In the above power system , Generally, insulating clamps are not used .（  √  ）

98、【 Judgment questions 】() The current whose magnitude and direction do not change with time is called steady DC .（  √  ）

99、【 Judgment questions 】() When someone gets an electric shock , Have trouble beating your heart , It can be injected with a cardiotonic needle .（  ×  ）

100、【 Judgment questions 】() The power grid consists of three parts , Transformer 、 Transmission and distribution lines and power users .（  ×  ）

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