Safety Supervision Bureau melt welding and thermal Cutting work includes: gas welding and gas cutting, welding rod arc welding and carbon arc gas planing, submerged arc welding, gas shielded arc welding, plasma arc welding, electroslag welding, electron beam welding, laser welding, oxy-flux cutting, Lehigh's tube
Safety Supervisory Bureau of Welding Exam Dumps (Judgment) ) as a reference, if there is any error, please contact Mr. Hu, Nanchong Zhiyuan) ).
1 . When the industrial frequency current passes through the human body, the average perceived current of an adult male is 10mA (error) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )
2 . Welding high current tester can display the current value and time value (accurate)
3 . Multiple welding machine workplace water source pressure is too low or unstable, should set up a dedicated cooling water circulation system (correct) ).
4 . When working in a wet environment, the welder must use dry, insulated and reliable welder's gloves, but not insulated rubber mats (if any)
5 . The higher the voltage a person is exposed to with dry skin, the lower the body resistance (wrong) ).
6 . When welding low-carbon steel, due to the effect of high welding temperatures, grain growth is too fast, carbides tend to accumulate and grow at grain boundaries, making the weld weak and the strength of the welded joints
downtime (error) ) )
7 . Atoms of two elements are combined in certain proportions, but the crystal structure of each remains unchanged, and the mutual position of the atoms of each element in the crystal lattice is fixed
Compound.
(wrong)
8 . Fusion welding is a welding done by heating the metals in the joint to a molten state by localized heating (accurate) ) ) ) ).
9 . The arc in submerged arc welding is burned covered by a layer of granular weldable flux and the arc is not exposed"
10 . Laser welding is the use of laser heat and pressure welding, is a kind of pressure welding (error) ).
11 . Atoms in crystals are loosely distributed and locally ordered (wrong)
12 . Nitric acid has a passivating effect on iron and retards corrosion(
13 . Benzene has an explosion temperature limit of 15 (wrong) ).
14 . Steam boiler explosion is a chemical explosion (error) ) ) ) .)
15 . The explosion pressure of sulfur is 500 Kpa (mistake) ) ) ) ) ) ) .)
16 ) Welders work to prevent burns by avoiding ignited flames (correct) ).
17 .
18 . Thorium tungsten rods are the most commonly used non-radioactive tungsten electrodes (mistake) ) ) ) ).
19 . Gas welding brass produces both smoke and toxic gases (correct) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) .)
20.The amount of dust generated when welding with E4301 electrodes has little to do with the current and more to do with the voltage (incorrect) ) ) ).
21 . Occupational disease diagnosis physician should have the qualification of licensed physicians, with intermediate or higher health professional and technical positions practice qualification, familiar with the norms of prevention and treatment of occupational diseases and occupational
disease diagnosis standards are: engaged in occupational disease diagnosis and treatment of related work for more than 5 years, familiar with the position of prevention and treatment of occupational disease hazards and their management, after training, examination, and obtain the qualification certificate issued by the provincial administrative department of health (English)
. p>22 . Particles with a diameter of less than 0.1 mm are called smoke (error) ).
23 .
24 ) In order to have a small dilution rate and form a good overlay, the overlay current and arc voltage must be well matched (normal)
25 . Direct current is harmful to the human body, while the average escape current for men is 76, mA (correct) ).
26 . When gas shielded arc welding, hydrogen can only be mixed with oxygen, not with other gases. Otherwise, it is particularly dangerous (wrong)
27 . Gas welding gas cutting process flame energy rate for the thickness of the welded component, select the melting point and thermal conductivity of the base material and the spatial position of the weld (accurate) ).
28 . By gas cutting can be cut in various positions on the steel plate, you can cut complex parts of various shapes on the steel plate (accurate) ).
29 . Annular electroslag welding uses an adjustable internal water-cooled molding ring (incorrect) ) ) ) .)
30 . Surfacing speed indirectly affects surfacing formation (error)
31 . The advantage of shielding gas shielded arc welding with pure Ar gas for welding low alloy steel is that the arc is very stable (for example
32 . Carbon dioxide welding cannot weld ferrous metals (error) ) ) ).
33 . A filled gas cylinder is a source of danger (correct) ) ).
34 . Occupational health management focuses on prevention, based on the history of occupational exposure of workers, through regular or irregular medical checkups and collection of health-related information,
continuous checking of the health status of the workers, analyzing the relationship between changes in the health of the workers and the occupational hazards of exposure to occupational diseases, and reporting the results of the medical checkups and analysis of the data to the employer and the workers themselves in a timely manner, so that timely intervention measures can be taken to protect the workers' Health (
35.ISO14000 is the International Organization for Standardization ( ISO ) and other 207 Technical Committee ( TC207 ) from 1993 to develop a series of international standards for environmental management (positive
indeed)
36 . Hazardous factors occurring in fusion welding are mainly related to the fusion welding process, welding equipment, welding specifications and the use of gases (accurate) ).
37. ISO14000 promote in line with the national policy of "sustainable development" (correct)
38 . Electrical boxes are not installed, locks, electrical box door confusion, randomly installed fuses, a gate to control a number of machines, electric shock will not occur (error)
39 . Gas welding gas cutting process used in the diameter of the wire according to the thickness of the weldment and bevel form selection (accurate) ) ) ) ) ) .)
40 . Electron beam spot size is small, power density, welding depth to width ratio of up to 50:1 (error) ).
41 . In the case of throttle hole type plasma arc welding, the required energy density decreases when the plate thickness increases (error) ) ).
42 . The plasma arc emits a high-intensity, high-frequency drying sound, and the operator must wear earplugs when operating (correct).
43 . Electron beam welding in the practical more vacuum electron beam welding (correct) ).
44 . For most fusion welding equipment, the determining factor for the suitability of the supply busbar is the permissible voltage drop, and there is no need to consider the heat generation factor (error)
45 . Nonmetallic elements do not have the characteristics of metallic elements but are close to metals, and the conductivity of nonmetals decreases with increasing temperature (error) ).
46 . Welding technique can be used only for joining metallic materials (Error) ) ) ) ) ) ) .)
47 . Chemical explosion is a chemical change of a substance accomplished in a very short period of time to form other substances, while releasing large amounts of heat and gases (Note:
48 . Gas conduit leakage fire, use cotton to extinguish the fire (correct) ) .)
49 . Manganese has a severe slow onset, something as long as 20 years ( (correct) ) ) ) ).
50 . Certain equipment produces hazardous or toxic substances during operation that endanger people or things.
Internal combustion engine exhaust, power plant exhaust fumes, electroplating, etc.
Process waste liquids, etc. ( (correct) )
51 . Occupational health examination is the implementation of the obligations of employers, the realization of the rights of workers is an important safeguard, is the implementation of occupational disease diagnosis and appraisal system is a prerequisite for the social security
disability system is also the basis of social security
disability system helps him to protect the rights and interests of workers' health and to reduce the damage to health and economic losses, reduce the burden on society (Germany
52 . It is the most common hazard of welding work and the most widespread occupational hazard. Welding fumes, toxic gases, arc light exposure, high temperatures (wrong) ) ).
53 . Air occupies a certain space but does not have a certain shape or volume ( (correct) ) ) ) .)
54 . With the addition of mechanical safety guards and blackout protection, the likelihood of a mechanical accident is reduced (correct) ).
55 . Hole, edge, cross work, climbing work, hanging work can be reduced by standardizing the use of helmets, safety nets, safety belts, and strictly strengthened protective measures
Overhead fall accidents occur (correct) ) ).
56 . Indoor welding operations should avoid the retention of flammable and explosive gases (or vapors) accumulation, in addition to the necessary ventilation measures, should be set up gas analyzers and alarms
(correct)
57 . The minimum thickness of a single layer of hand arc overlay welding is 3.2mm (accurate) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )
58 . Carbon arc planer rod operation must be submitted, DC arc welding machine, and air compressor (error) ).
59 . Carbon dioxide can be used in cars, ships, automobiles, containers, mining and construction machinery (
60 . The gas in the argon cylinder is depleted (error) ) ).
61 . Welding rod arc welding is carried out by manual operation of the welding rod for welding operations, can not be flat welding, vertical welding, back welding operations ( )
62 . Magnesium-aluminum alloys with a thickness of less than 1.6 mm require the use of Ar as a shielding gas when welding by the small-hole method and the depth-of-fusion method () (error) ).
63 . Welding electrode consists of two parts: flux skin and welding core (correct) ).
64 . When storing gas cylinders, they can be stored in special warehouses (incorrect) ) ) ).
65 . When welding in a dark environment with insufficient light, you must use a portable work lamp, and under normal circumstances, the voltage of the lighting lamp used does not exceed 36 V.
Hazardous environments such as humidity, metal containers
Do not use more than 16 V of the lighting line lamp (error)
66 . Cardiac resuscitation resuscitation, press blowing, with "see, listen, try" method to review the electrocution of the electrocuted whether to restore the natural breathing and heartbeat
judgment (error) ) )
67 . Treatment must be suspended while the electrocuted person is being moved or taken to the hospital (error) ) ) ) ) .)
68 . Copper is slightly less dense than iron (error) ) ) ) ) ) .)
69 . A metal made from a combination of two or more arbitrary elements is called an alloy (Error)
70 . Sodium hydroxide cannot corrode aluminum (Error) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) .
71 . A fire in a place where concentrated hydrochloric acid is accumulated in large quantities cannot be extinguished by direct current (error) ) ) ) .
73 . Oxygen cylinder valve fire, the operator closed the valve to isolate the oxygen, the fire extinguished itself (correct) ).
74 . Underwater welding and thermal cutting, welding power supply must use direct current, prohibit alternating current (correct) ).
75 .
76 . A high-frequency electromagnetic field is generated when welding together stainless steel with a tungsten arc (accurate) ) ) ).
77 . When arc welding operations, try to use a low dose of cerium electrode (accurate) ) ) ) ) .
78 . Accident hazard is the unsafe human behavior, unsafe state of things and management defects in the production system that may cause accidents.
(Correct)
79 . The Work Safety Law stipulates that production and operation units should formulate emergency plans for major sources of danger.
80 . In addition to complying with the general rules of work safety, the work safety of brazing operations should give full consideration to the specialized characteristics and technical requirements of brazing (accurate)
81 . Hazardous source is the root cause or state that may lead to injury, disease, property damage, destruction of the working environment or other losses (accurate)
82 . The Work Safety Law stipulates that production and operation units may lose major hazardous sources on a one-time basis, and may inspect, evaluate and monitor them from time to time.
(wrong)
83 . Occupational medical examination can only be conducted by medical licensed and technical personnel (correct) ).
84 . Vehicles and boats transporting gas cylinders shall not be parked in the downtown area or near important institutions. "When the vehicle or boat is parked, the driver and the escort shall not leave at the same time. "
85 . Welding parameters can be kept stable (accurate) by automatic adjustment during automatic submerged arc welding
86 . Chemical-active metals and their alloys require high argon purity (correct)
87 . Surfacing personnel should first establish a "safety first" idea (correct)
88 . Plasma arc cold rolled plate surfacing in the process and surfacing quality is less stable (error)).
89 . Slag welding molten pool exists for a long time, easy to remove low melting point inclusions and gases, less likely to produce porosity and slag
90 . Argon-hydrogen mixture is also commonly used (accurately) when welding stainless steel and base combinations
91 . The rights of brazing employees include (correct) the right to workers' compensation and supervision).
92 . The difference between crystalline and non-crystalline is the arrangement of atoms inside, not their shape ( (correct) ) ) .)
93 . After low temperature tempering steel hardness decreases slightly and toughness increases ( (accurate) ) ).
94 . Carbon dioxide extinguishers can be used to extinguish calcium carbide (incorrect) ).
95 . The internal cause of spontaneous combustion of oil and grease has a relatively large oxidized surface (such as the fibrous material of the oil) have air, with heat storage conditions (error) ).
96 . Hazards of rotary motion are injuries caused by the human body or clothing entangled in the rotating parts of the machine (correct)
97 . Hazards occurring in fusion welding strongly the effect of welding equipment (incorrect) ) ).
98 . Click is the current trauma to the human body (error) ) ).
99 . There is more metal spatter in carbon dioxide welding (correct) ) ).
100 . Small parts, precision parts of the welding can be used in small power welder (accurate)
101 . Gas cylinders in use, if there is serious corrosion, damage or doubt about its safety and reliability, should be checked in advance (accurate) ).
102 . When operating the laser cutter, the laser should be started according to the laser startup program (correct) ) .)
103 . Calcium carbide slag in contact with water combustion hazardous material (correct) ).
104 . Shielded arc welding welding environment should be well ventilated (correct) ) ) ) ).
105 . The welding speed of the submerged arc automatic cladding welding machine is not adjustable and the welding speed is stable (accurate) ).
106 . Welding machines are not melt welding equipment (correct) ) ).
107 . The method of disconnecting from a low voltage power source can be summarized in the words "pull, cut 'select, pull'" (incorrect) ) ) ) ) ) .)
108 . Really? The addition of iron to the can effectively improve its mechanical properties, but heat and corrosion resistance is reduced ( p
109 . The mixed gas of the molten pole mixed gas shielded arc welding is blown into the welding zone through the nozzle at a certain flow rate after uniformly mixing a variety of gases in a specified ratio through the gas supply system.
The gas mixture can be two gases or multiple gases (
10 . The plasma arc is a gas stream (correct) ) ) ) ).
11 . Resistance welding has a short heating time, concentrated heat, and a small heat affected zone (accurate) ) ).
112 . Large amounts of acid and alkali spills can only be mixed with sediment, materials neutralized with acid and alkali. Alternatively, it can be flushed with large amounts of water. Who dilutes it and puts it into the wastewater system (error) 113 ) Alcohol surge concentration limit is 20 ) error).
114 . Strong fumes are produced during submerged arc welding (wrong)
15 . "Safety first" means that the safety of property is always given top priority in production and business activities (
116 . Toxic zinc and lead fumes from resistance welding of plated plates, large amounts of metal vapor from flash welding, and metal dust from grinding electrodes, of which cadmium and beryllium in both cadmium-copper and beryllium-cobalt-copper electrodes are more toxic ( p
117 . Metallized skin falls off on its own over time and generally leaves behind undesirable consequences (wrong)
118 . Carbon dioxide welding cannot weld power plant equipment (wrong) ).
19 . Adding carbon dioxide to ar reduces the critical current (error) ).
120 ) When hand arc welding overlays, always choose a small current, short arc overlays (accurate)
121 ) Argon arc welding is chemically active and has been able to weld high melting point oxide films and magnesium, aluminum, titanium and their alloys (accurate)
122 . Submerged arc welding, AC power supply is mostly used for high-current submerged arc and the use of DC when the magnetic bias is serious (accurate)
123 . Most of the metal can be ordinary TIG welding can plasma arc welding(accurate)
124 . Aluminum heat welding equipment is more complex, generally should not be used (wrong) ).
125 .
126 . Brazing operation production, the gas cylinder does not leak (error)
127 . The welding machine can be installed adjacent to a large-flavor press (wrong) ).
128 . When the scene is not convenient for on-the-spot CPR, adjustments should be made as repeatedly as possible until the electrocuted casualty comes to a convenient location ( (wrong) ).
129 . When a metallic material is destroyed by tensile work, the percentage of the area of the cross-section of the fracture section that is reduced and the original cross-sectional area is called impact toughness (error)
130 . Ancient welding technology has long remained at the level of casting welding, forge welding and brazing, the heat source used is fire, generally used for large sections of long welders ( p
131 . Gas welding and overlay welding is arc welding (error) ) ) ) ) ).
132 . The regular arrangement of metal atoms in a certain way in a lattice of a certain spatial geometry is called a lattice (correct)
133 . Crimping can be done without heat but only by applying pressure (accurate) ) ) ) ) ) .)
134 . The properties of a metallic material depend not only on the chemical composition of the metal but also on the (correct) organization of the metal).
135 . Pure concentrated sulfuric acid is a colorless oily liquid (correct) ) ) ) .
136 . Foam extinguishing agents can be categorized into three types according to the foam generation mechanism ((incorrect) ) ) ).
137 . There are five main (wrong) overview of the current fire codes in China
138 . Combustibles, combustion aids, and sources of ignition constitute the three elements of combustion, the lack of one of which can not be burned (correct) ) ) ) .)
139 . The natural point of wood flour is lower than (correct) magnesium powder
140 . When cleaning a container, the end of the vapor pipe must extend to the bottom of the liquid (correct) ).
141 . If you do not use a pressurized replacement weld. it is equally necessary to replace the original gas (incorrect) ) ) ).
142 . Common accidents in underwater welding and thermal cutting operations do not include bruises and burns ((error) ) ) ).
143 . The site should be strengthened ventilation, open flames are strictly prohibited ((accurate) ) ) ).
144 . The feeding of automatic submerged arc welding wire is carried out by the wire feeder head and the arc movement is controlled manually (error) ) ) ) ) .)
145 . The heating principle used in melt welding equipment is the principle of resistance heating (error) ) ) ) ) ) ) ) ) ).
146 . To minimize carbon rod burnout, the flow rate of compressed air must be high (error) ).
147 . Gas generators used for gas welding or gas cutting are pressure vessels and are not likely to cause an explosion or fire accident () ).
148 . A submerged arc automatic cladding machine has two welding machines that must be used simultaneously to perform welding work (error) ).
149 . Gas welding is a method of molten welding using a gas flame as a heat source (correct) ).
150 . Gas cutting is a method of cutting steel and iron materials using a gas flame (called a preheated flame) (accurate) ).
151 . Thick plate tungsten argon arc welding generally requires that the chemical composition of the filler metal is different from that of the base material (incorrect)
152.LUP-300 and LUP-500 plasma arc powder welder can not be common (incorrect) ).
153 .
154 . In dealing with the relationship between safety and security and production and business activities, priority is given to property safety (error) ).
155 . Prohibit (correctly) the exposure of gas cylinders to sunlight or near heat sources) ).
156 . A good or bad welding torch has little (wrong) effect on the quality of the weld ) ).
157 . When surfacing the wall of the bore, filling the bore with sand for surfacing can improve productivity (accurate) ).
158 . For oxy-acetylene overlays, the largest possible size of torch should be used (incorrect) ).
159 . Carbon dioxide survival is higher than (correct) arc welding) ).
160 . The electrode and gong are fused with each other in the process of electrode arc welding, and the weld is formed by secondary metallurgical condensation to obtain a welded joint (accurate) ).
161 . Welding electrode welding, the chemical composition of the core, does not affect the quality of welding (wrong) ).
162 . Accident hazards are divided into general accident hazards and major accident hazards (correct) ).
163 . When the safety voltage level is 36V, the height of the lighting fixture from the ground is 2.5m|(accurate) ) ).
164 . Most of the stainless steel commonly used in life is martensitic stainless steel (error) ) ) ).
165 . Stud welding is a typical application of capacitor discharge spot welding (accurate) ) .
166 . Low-carbon tempered martensite has considerable strength and good combination of forming and toughness (see)
167 . Tempering obtains an optimum combination of toughness and strength and a good combination of mechanical properties (accurate)
168 Effective welding method for workpieces of large thickness when welding (accurate) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )
169 Titanium alloy is a high melting point metal, but can be melt welded with the appropriate welding method (accurate) ) ) ) ).
170 Sodium hydroxide corrodes plastics ((incorrect) ) ).
171 The explosion limit of a flammable gas or liquid is the maximum value, there is no minimum value (error) ) ).
172 Wet welding is when a welder welds directly in water (accurate) ) ) ) ).
173 Occupational health inspection organizations should report the results of occupational health inspections objectively and truthfully, using the results of the inspections and summary reports shown by them are not responsible for (incorrectly) 174 A mobile power box can connect only one fusion welding device on one power branch. The equipment has a nameplate and the power and lighting circuits must be separated (correct) ).
175 The shorter the wire from the switchboard to the welder the less is the cure number (incorrect) ). Silicon is added to it to improve mechanical properties, corrosion resistance, and wear resistance, and it is used in the manufacture of seagoing ship parts and chemical machinery parts (accurate).
178Silicon is a nonmetal, but possesses (accurate) some metallic properties) ) ) ).
179 Pure hydrochloric acid is a silent, transparent solution (correct) ) ).
180 Liquids, in the presence of an ignition source, first evaporate and then the vapors oxidize and decompose and burn (correct) ) ).
181 Combustion of combustible substances usually takes place in the vapor state (incorrect) ) ) ) ) ) 181 Combustion of combustible substances) ) ).
182 An extinguishing agent is a substance that effectively destroys the conditions of combustion and stops it (correct) ) ).
183 Dry powder extinguishers can be used to (correctly) fight fires in electrical equipment).
184 Arc burns occur when improper operation and the human body gets too close to a high-voltage charged body to produce an arc discharge, when the high-temperature arc burns the skin like a flame (correct) ).
185 welding shop welder working area of no more than 4 square meters, the ground should be basically dry (correct) ).
186 Automatic and manual welding is mainly used in the manufacture of large-scale mechanical equipment, which is mostly located on site, and the workplace is relatively fixed (e.g.
187 When using an Ar-H2 gas mixture as the ionizing gas, the rated current of the nozzle aperture should be reduced due to the high arc temperature (accurate) ).
188 The principle of selecting submerged arc welding specifications is to ensure that the arc burns stably, the shape and size of the weld meets the requirements, the surface is shaped cleanly and neatly, and there are no internal defects such as gas holes, weld slag, cracks, unwelded, weld tumors and so on (accurate).
189 With tungsten argon arc welding wire as the electrode, the molten pool is filled while melting, and the weld is formed by condensation ( (error) ) ) ).
190 Ordinary rubber hoses and gaskets can be used as attachments to LPG cylinders ( (error) ) ) ).
191 From economic considerations, electroslag welding is mostly done with a DC positively connected power source (incorrect)
192 There are five types of street forms of tungsten argon arc welding ((correct) ) ).
The electrical signal from a 193 laser detector is proportional to the detected laser energy (accurate) ).
194 graphite crucible at high temperatures will bring a lot of carbon increase to the aluminum hot steel, aluminum hot welding welding mechanical properties are not guaranteed, so can not be used directly for aluminum hot welding steel rails (accurate) ) ).
195 orifice plate plasma arc welding, the prerequisite for obtaining a quality weld is to ensure the stability of the orifice plate in the welding ( p
According to 196 The People's Republic of China *** and the State Law on Work Safety, the production and management units should be registered and archived on the major sources of danger.
197 Broadly speaking, a major source of danger is a source of danger that may cause a major accident (accurate)
198 Safe production of welding operations is to make the production process of brazing operations in accordance with the material conditions and the order of the operation to carry out
199 Safe production of work in the production activities should be avoided as far as possible accidents (mistakes)
200 Brazing operations Gas cylinders may leak, causing poisoning, fire and explosion accidents (correct) ).
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