The welding and hot cutting work of the Safety Supervision Bureau includes: gas welding and gas cutting, covered electrode arc welding and carbon arc gouging, submerged arc welding, gas shielded welding, plasma arc welding, electroslag welding, electron beam welding, laser welding, oxygen flux cutting and Raytheon tube.
Use the welder examination question bank (judgment question) of the Safety Supervision Bureau as a reference. If there is any mistake, please contact Mr. Hu Zhiyuan of Nanchong).
1. When the power frequency current passes through human body, the average perceived current of adult males is 10mA (error)))) 1. When the power frequency current passes through human body, the average perceived current of adult males is 10mA (error).
2. The welding high current tester can accurately display the current value and time value.
3. When the water pressure in the workplace of multiple electric welding machines is too low or unstable, a special cooling water circulation system should be set up (correct)).
4. When working in a humid environment, the welder must use dry and reliable welding gloves, but there is no need for insulating rubber pads (if any).
5. When human skin is dry, the higher the contact voltage, the smaller the body resistance (error).
6. When welding low carbon steel, due to the influence of high welding temperature, the grain grows too fast, and carbides tend to gather and grow on the grain boundary, which makes the welding brittle and the strength of the welded joint poor.
Power off (error)).
7. The atoms of the two elements are combined in a certain proportion, but their respective crystal structures remain unchanged, and the mutual positions of the elements in the lattice are fixed.
Compound.
(error)
8. Fusion welding refers to a welding method that the metal of the joint is locally heated to a molten state (to be precise, a molten state).
9. During submerged arc welding, the arc is covered and burned by the granular solderable flux layer, and the arc is not exposed. "
10. Laser welding is a kind of pressure welding by using the heat and pressure of laser.
1 1. The atoms in the crystal are loosely distributed and locally ordered (wrong).
12. Nitric acid can passivate iron and delay corrosion (
13. The explosion temperature limit of benzene is 15 (error)).
14. The explosion of the steam boiler is a chemical explosion (error)).
15. The explosion pressure of sulfur is 500Kpa (error)))).
16) welders should avoid lighted flames and avoid being burned during work (correct).
17. The supervisor inhaled toxic gas (error)) (error) (error) (error) (error) (error) (error) (error) (error) (error)
18. Thorium tungsten rod is the most commonly used non-radioactive tungsten electrode (error)).
19. When welding brass, both smoke and toxic gas will be produced (correct statement) (correct statement) When welding brass, smoke and toxic gas will be produced (correct statement).
20. The dust emission of E4301covered electrode in the welding process has little to do with current, but has a great relationship with voltage (error).
2 1. The occupational disease diagnostician shall have the qualification of practicing doctor, have the qualification of intermediate or above health professional and technical post, and be familiar with the occupational disease prevention norms and occupations.
The criteria for disease diagnosis are: having been engaged in the diagnosis and treatment of occupational diseases for more than 5 years, being familiar with the prevention and management of occupational hazards, passing the training and examination, and obtaining the qualification certificate issued by the provincial health administrative department (English).
22. Particles with a diameter less than 0. 1mm are called smoke (error).
23. There is no welder's goggles for welders. 10 (error)))) (Error) (Error) (Error) (Error) (Error) (Error) (Error) (Error) (Error)
24) In order to reduce the dilution rate and form a good surfacing layer, the surfacing current and arc voltage must cooperate well (under normal circumstances).
25.DC is harmful to human body, while the average escape current of men is 76, mA (correct)).
26. Gas shielded arc welding, hydrogen can only be mixed with oxygen, not with other gases. Otherwise, it is particularly prone to danger (error).
27. The flame energy rate of gas welding and gas cutting process is the thickness of welded components, the melting point and thermal conductivity of parent metal and the selection of welding space position (accurate)).
28. Through gas cutting, you can cut at various positions on the steel plate, and you can cut complex parts of various shapes on the steel plate (accurately).
29. The adjustable inner water-cooled forming ring is used for circumferential electroslag welding (error)).
30. The surfacing speed indirectly affects surfacing forming (error).
3 1. Low alloy steel used for pure Ar gas shielded welding has the advantage of very stable arc (for example
32. Carbon dioxide welding cannot weld ferrous metal (error)).
33. The filled gas cylinder is a dangerous source (correct)).
34. Occupational health management focuses on prevention. According to the workers' occupational contact history, through regular or irregular physical examination and the collection of health-related information,
Continuously check the health status of workers, analyze the relationship between the health changes of workers and the occupational hazards they are exposed to, report the physical examination results and data analysis to the employer and the workers themselves in time, and take timely intervention measures to protect the health of workers (
35. á o140000 is a series of international standards for environmental management (ISO and other TC207 technical committees) formulated by19930.
Indeed)
36. The harmful factors in fusion welding are mainly related to fusion welding technology, welding equipment, welding specifications and the use of gas (accurate).
37. ф o140000 National policy of promoting "sustainable development" (correct)
38. The electric box is not installed and locked, the door of the electric box is messy, and the fuse is installed at will. One gate controls multiple machines, and there will be no electric shock accident (misoperation).
39. The diameter of welding wire used in gas welding and gas cutting is selected according to the thickness of weldment and groove form (accurate))))).
40. The electron beam spot size is small, the power density is high, and the maximum welding depth-width ratio is 50: 1 (error)).
4 1. In the case of orifice plasma arc welding, when the thickness of the plate increases, the required energy density decreases (error).
42. The plasma arc emits high-intensity and high-frequency drying sound, and the operator must wear earplugs when operating (correctly).
43. In practice, electron beam welding is mostly vacuum electron beam welding (correct).
44. For most welding equipment, the decisive factor for the applicability of power bus is the allowable voltage drop, regardless of the heating factor (error).
45. Non-metallic elements do not have the characteristics of metallic elements, but are close to metals, and the conductivity of non-metallic elements decreases with the increase of temperature (error)).
46. Welding technology can only be used to connect metal materials (wrong)))))).
47. Chemical explosion refers to the phenomenon that substances change chemically in a very short time, forming other substances, and releasing a lot of heat and gas at the same time (Note:
48. When the gas pipeline leaks and catches fire, put out the fire with cotton cloth (correct)).
49. The severe onset of manganese is slow, and some things have been 20 years ((correct))).
50. Some equipment will produce harmful or toxic substances during work, which is harmful to people or things.
Exhaust gas from internal combustion engine, smoke exhaust from power plant, electroplating, etc.
Process waste liquid, etc. (Correct))
5 1. Occupational health examination is an important guarantee for fulfilling the obligations of employers and realizing the rights of workers, a prerequisite for implementing the occupational disease diagnosis and appraisal system, and also a social security.
The establishment of the disability system will help him to protect workers' health rights and interests, reduce health damage and economic losses, and reduce the social burden (Germany
52. It is the most common hazard in welding work and the most extensive occupational hazard. Welding smoke, toxic gas, arc irradiation, high temperature (error)).
53. Air occupies a certain space, but it has no certain shape and volume ((correct))).
54. After adding mechanical safety protection devices and power-off protection devices, the possibility of mechanical accidents is reduced (correct)).
55. By standardizing the use of safety helmets, safety nets and safety belts, and strictly strengthening protective measures, it is possible to reduce the entrance of the cave, limb, cross operation, climbing operation and suspended operation.
Falling accident occurred (correctly)).
56. Indoor welding operations should avoid the accumulation of flammable and explosive gases (or steam). In addition to the necessary ventilation measures, gas analysis instruments and alarms should also be set up.
(correct)
57. The minimum thickness of manual arc surfacing is 3.2mm (accurate))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
58. At work, carbon arc planer, DC arc welder and air compressor must be submitted (error).
59. Carbon dioxide can be used in automobiles, ships, automobiles, containers, mines and construction machinery (
60. Gas in argon bottle is exhausted (error).
6 1. Manually operate covered electrode for covered electrode arc welding, but not for flat welding, vertical welding and overhead welding ().
62. When the thickness of Mg-Al alloy is less than 1.6mm, it is necessary to use Ar as shielding gas when welding by keyhole method and penetration method.
63. The coated covered electrode consists of two parts: coated wire and flux-cored wire (correct).
64. When storing gas cylinders, don't store them in a special warehouse (error)).
65. When welding in a dark environment with insufficient light, portable working lights must be used. Under normal circumstances, the voltage of the used lighting lamp shall not exceed 36V.
Wet metal container
The voltage of lighting lamps in dangerous environment should not exceed 16V (error).
66. During cardiopulmonary resuscitation, after blowing, use the method of "seeing, listening and trying" to check whether the electric shock person has recovered his natural breathing and heartbeat.
Judgment (error))
67. Treatment must be suspended on the way to move the electrocuted person or hospital (error)).
68. The density of copper is slightly less than that of iron (error)).
69. A metal composed of two or more arbitrary elements is called an alloy (error).
70. Sodium hydroxide can't corrode aluminum (error)))).
7 1. All kinds of combustible materials need the same temperature and heat (error)))) Answer: 1. Answer: 1. Answer: 1.
72. A fire broke out where a large amount of concentrated hydrochloric acid accumulated, and direct current could not put it out (error)).
73. The oxygen cylinder valve is on fire, the operator closes the valve to isolate oxygen, and the fire goes out by itself (correct)).
74. When underwater welding and hot cutting, the welding power supply must use DC, and AC is disabled (correct).
75. When welding repair is replaced, if the isolation work is unreliable, it is impossible to (correctly) weld (correctly) weld (correctly) weld (correctly) weld (correctly) weld (correctly) weld (correctly).
76. Tungsten arc welding stainless steel will produce high frequency electromagnetic field (accurate)).
77. When arc welding, try to use low dose cerium covered electrode (accurate)).
78. Accident risk refers to the unsafe behavior of people, the unsafe state of things and management defects that may cause accidents in the production system.
(correct)
79. The Law on Work Safety stipulates that production and business operation entities shall formulate emergency plans for major hazard sources.
80. In addition to observing the general safety production rules, the safety production of brazing operation should also fully consider the professional characteristics and technical requirements (accuracy) of brazing.
8 1. Hazard source refers to the source or state (accurate) that may lead to personal injury, illness, property loss, damage to working environment or other losses.
82. The Law on Work Safety stipulates that production and business operation entities may lose major hazards at one time without regular inspection, evaluation and monitoring.
(error)
83. Occupational physical examination can only be carried out by medical practitioners and technicians (correct)).
84. Vehicles and ships transporting gas cylinders shall not be parked near downtown or important organs. "When a car or ship stops, the driver and the escort are not allowed to leave at the same time."
85. When submerged arc welding is automated, the welding parameters can be kept stable (accurate) through automatic adjustment.
86. Chemically active metals and their alloys require high argon purity (correct).
87. Personnel engaged in surfacing welding should first establish the idea of "safety first" (correct).
88. The plasma arc cold-rolled plate surfacing is unstable in process and surfacing quality (error).
89. The molten pool of slag welding exists for a long time, which is easy to eliminate low melting point inclusions and gases, and is not easy to produce blowholes and slag inclusion.
90. When welding stainless steel and matrix alloy, argon-hydrogen mixture is also commonly used (accurate).
9 1. The rights of brazing workers include (correction) compensation for work-related injury insurance and supervision).
92. The difference between crystalline and amorphous is the internal atomic arrangement, not its shape ((correct)).
93. After low-temperature tempering, the hardness of steel decreased slightly and the toughness increased (accurately).
94. Calcium carbide can be put out with a carbon dioxide fire extinguisher (error)).
95. The internal cause of oil spontaneous combustion is that the oxidation surface is relatively large (such as oil fiber material) with air and heat storage conditions (wrong)).
96. The danger of rotating movement refers to the injury caused by the human body or clothes involved in the rotating part of the machine (correct)
97. The influence of welding equipment with strong harmful factors in fusion welding (error).
98. Click is the trauma (error) of current to human body.
99. Carbon dioxide welding metal spatter (correct)).
100. Small parts and precision parts can be welded with a low-power welder (accurately).
10 1. If the gas cylinder is seriously corroded, damaged or has doubts about its safety and reliability, it should be inspected in advance (correct)).
102. When operating the laser cutting machine, start the laser according to the laser starting procedure (correct).
103. Calcium carbide slag burns dangerous goods when it meets water (correct)).
104. The welding environment of arc welding should be well ventilated (correct)).
105. The welding speed of automatic submerged arc welding surfacing machine is not adjusted, and the welding speed is stable (accurate)).
106. The welding machine is not a fusion welding device (correct)).
107. The way to get rid of low-voltage power supply can be summarized in four words: "pull, switch' select, pull'" (error)))))).
108. Really? Adding iron can effectively improve its mechanical properties, but the heat resistance and corrosion resistance decrease (P
109. The mixed gas of MIG shielded arc welding is evenly mixed by the gas supply system according to the specified proportion, and then blown into the welding area through the nozzle at a certain flow rate.
The mixed gas may be two gases or a plurality of gases (
10. Plasma arc is airflow (correct))).
1 1. Resistance welding has short heating time, concentrated heat and small heat affected zone (accurate)).
1 12. A large amount of acid and alkali leaks, which can only be mixed with sediments and substances neutralized by acid and alkali. In addition, it can also be washed with plenty of water. Who diluted the waste water system (error) 1 13) alcohol concentration limit 20) error).
1 14. Strong smoke (error) will be generated during submerged arc welding.
15. "Safety first" means always putting property safety first in production and business activities (
165438+
1 17. Metallized skin will fall off by itself over time, which will generally leave adverse consequences (errors).
1 18. CO2 welding cannot weld power plant equipment (error)).
19. Adding carbon dioxide to ar will reduce the critical current (error).
120) manual arc welding surfacing, always choose small current and short arc surfacing (accurate).
12 1) argon arc welding has strong chemical activity, and it has been able to weld high melting point oxide film and magnesium, aluminum, titanium and their alloys (accurately).
122. When submerged arc welding, AC power supply is mostly used for submerged arc welding with high current, and DC is used for occasions with serious (accurate) magnetic bias.
123. Most metals that can be welded by ordinary TIG can be welded by plasma arc (accurate).
124. The equipment for thermite welding is complicated and generally unsuitable for use (error)).
125. Plasma arc has concentrated energy, high temperature and full melting, but it can form uniform weld (accurate))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
126. In the production brazing operation, the gas cylinder does not leak (error).
127. The welding machine can be installed next to the bulk press (error).
128. When the scene is inconvenient for cardiopulmonary resuscitation, it should be adjusted repeatedly as much as possible until the electric shock person comes to a convenient position ((error)).
129. When the metal material is damaged due to tensile operation, the percentage of the reduction of the cross-sectional area of the fracture site to the original cross-sectional area is called impact toughness (error).
130. The ancient welding technology stayed at the level of casting welding, forging welding and brazing for a long time, and the heat source used was fire, which was generally used for welding long welders with large sections (P
13 1. Both gas welding and surfacing are arc welding (error)))).
132. Metal atoms are regularly arranged in a lattice with a certain spatial geometry in a certain way, which is called lattice (correct).
133. Crimping can be performed only by applying pressure without heating (accurate))).
134. The performance of metal materials depends not only on the chemical composition of the metal, but also on the (correct) metal structure.
135. Pure concentrated sulfuric acid is a colorless oily liquid (correct)).
136. Foam extinguishing agents can be divided into three types according to foam formation mechanism ((error)).
137. There are mainly five (mistakes) in the summary of the current fire protection laws and regulations in China.
138. Combustible, combustion-supporting substance and fire source constitute the three major elements of combustion, and none of them can be burned (correct)).
139. The natural point of wood flour is lower than that of (correct) magnesium flour.
140. When cleaning the container, the end of the steam pipe must extend to the bottom of the liquid (correct).
14 1. If the weld is not replaced with pressure, the original gas needs to be replaced (error)).
142. Common accidents in underwater welding and hot cutting operations do not include bumps and burns ((error)).
143. The site should be ventilated, and naked fire is strictly prohibited (accurate).
144. The feed of automatic submerged arc welding wire is carried out by wire feeder head, and the arc motion is controlled manually (error))))))).
145. The heating principle adopted by welding equipment is resistance heating principle (error)))))))).
146. In order to reduce the burning of carbon rods, the flow of compressed air must be large (wrong).
147. Gas generators used for gas welding or gas cutting are all pressure vessels, which will not cause explosion or fire accident ().
148. The submerged arc automatic surfacing machine has two welding machines, and the welding work must be used at the same time (error)).
149. Gas welding is a fusion welding method with flame as heat source (correct)).
150. Gas cutting is a method of cutting steel by gas flame (called preheating flame) (accurate).
15 1. Generally, TIG welding of thick plates requires that the chemical composition of the filler metal is different from that of the base metal (error).
152.LUP-300 and LUP-500 plasma arc powder welding machines are not universal (error)).
153. When the surfacing speed is too high, the surfacing weld is widened (error)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
154. When dealing with the relationship between safety and production and business activities, give priority to property safety (mistakes).
155. It is forbidden to (correctly) expose cylinders to sunlight or near heat sources).
156. The welding torch quality has little influence on the welding quality (error).
157. When surfacing the inner hole wall, filling the inner hole with sand can improve the production efficiency (accurately).
158. When oxygen-acetylene surfacing, the welding torch with the largest size as possible should be used (error).
159. The survival rate of carbon dioxide is higher than that of (correct) arc welding.
160. In the process of covered electrode arc welding, the covered electrode and the workpiece are fused with each other, and the weld is formed by secondary metallurgical condensation, and the welded joint is obtained (accurate)).
16 1. When welding in covered electrode, the chemical composition of the welding core does not affect the welding quality (error)).
162. Accident risks are divided into general accident risks and major accident risks (correct)).
163. When the safe voltage class is 36V, the height of the lighting device is 2.5m| (accurate).
164. Most stainless steels commonly used in life are martensitic stainless steels (error)).
165. stud welding is a typical application of capacitor energy storage spot welding (accurate)).
166. Low carbon tempered martensite has the characteristics of high strength, good combination of formability and toughness (see).
167. Tempering can obtain the best combination of toughness and strength, and obtain good comprehensive mechanical properties (accurate).
168 effective welding method for large-thickness workpiece during welding (precise)) (precise) welding (precise) welding (precise) welding (precise) welding (precise)
Titanium alloy 169 is a high melting point metal, but it can also be welded by corresponding welding methods (accurately).
170 sodium hydroxide will corrode plastics ((error)).
17 1 The explosion limit of combustible gas or liquid refers to the highest value, and there is no minimum value (error)).
172 wet welding is that the welder directly welds in water (exactly, welds in water), welds in water (exactly, welds in water), welds in water (exactly, welds in water).
173 the occupational health inspection institution shall report the results of occupational health inspection objectively and truly. Only one welding equipment can be connected to one power branch by using 174 mobile power box, and it is not responsible for the displayed inspection results and summary report. The equipment has a nameplate, and the power and lighting circuits must be separated (correctly)).
175 the shorter the wire from the switch board to the welder, the less the number of cures (error).
176 when welding, the workpiece is not heated, and only hot solder is needed (error))))))))))))))) 652)
177 Really? Adding silicon can improve mechanical properties, corrosion resistance and wear resistance, and can be used to manufacture marine ship parts and chemical machinery parts (precisely).
178 silicon is nonmetallic, but it has some (correct) metallic properties.
179 pure hydrochloric acid is a silent and transparent solution (correct)).
180 liquid is vaporized under the action of fire source, and then oxidized and decomposed by steam (correct)).
18 1 combustible materials generally burn in steam (error)))) 18 1 combustible materials burn).
182 fire extinguishing agent is a substance that can effectively destroy combustion conditions and prevent combustion (correct)).
183 dry powder fire extinguisher can be used to (correctly) put out electrical equipment fires.
184 arc burn is that the human body is too close to a high-voltage charged body to produce arc discharge, and the high-temperature arc burns the skin like a flame (correct)).
185 the working area of welders in the welding workshop shall not exceed 4 square meters, and the ground shall be basically dry (correct)).
186 automatic welding and manual welding are mainly used in the manufacture of large-scale mechanical equipment, mostly located in the wild, and the workplace is relatively fixed (such as
187 when using Ar-H2 mixed gas as ion gas, the rated current of nozzle aperture should be reduced due to the high arc temperature.
188 the principle of choosing submerged arc welding specification is to ensure the arc combustion is stable, the weld shape and size meet the requirements, the surface is clean and tidy, and there are no defects such as blowholes, welding slag, cracks, incomplete penetration and flash (accurate).
189 TIG welding wire is used as electrode, which fills the molten pool while melting and condenses to form weld ((error)).
190 ordinary rubber tubes and gaskets can be used as accessories for liquefied petroleum gas cylinders (error)).
19 1 From the economic point of view, DC power supply is often used for electroslag welding (error).
192 TIG welding has five street shapes ((correct)).
The electrical signal from 193 laser detector is proportional to the detected laser energy (accurate)).
194 graphite crucible will bring a lot of carburization to thermite steel at high temperature, and the mechanical properties of thermite welding can not be guaranteed, so it can not be directly used for thermite welding rail (accurate).
In plasma arc welding of 195 orifice plate, the premise of obtaining high quality weld is to ensure the stability of the orifice plate during welding (P
According to the Law of People's Republic of China (PRC) on Work Safety (196), the production and business operation entity shall register and file the major hazard sources.
197 the broad sense of major hazards refers to the hazards that may cause major accidents (accurate).
198 safety production welding operation is to make the production process of brazing operation conform to the material conditions and operation sequence.
199 safety production should try to avoid accidents (mistakes) in production activities.
200 gas cylinders may leak during brazing, causing poisoning, fire and explosion accidents (correct).
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