国家职业资格考试-高级焊工模拟试题2（National vocational qualification exam - advanced welder simulation test 2）.docVIP

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国家职业资格考试-高级焊工模拟试题2（National vocational qualification exam - advanced welder simulation test 2）.doc

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国家职业资格考试-高级焊工模拟试题2（National vocational qualification exam - advanced welder simulation test 2）

国家职业资格考试-高级焊工模拟试题2（National vocational qualification exam - advanced welder simulation test 2） National vocational qualification examination Advanced welder simulation One, single choice (question 1 ~ 80. Choose a correct answer, and fill in the corresponding letter in brackets. 1. The mass fraction of carbon in low carbon steel is less than (A). B. a. 0.25% to 0.6% D. c. 0.8% to 2.11% The maximum stress that the material is subjected to before pulling out is called (C). A. yield point b. elongation C. Tensile strength D. Impact toughness 3. The commonly used Q235 steel is (A). A. Carbon structural steel b. high quality carbon structural steel C. Stainless steel d. low alloy strength steel 4. The organization of low carbon steel at room temperature is (D). A. austenite + cementite b. martensite + cementite C. Austenite + ferrite D. Pearlite + ferrite The purpose of quenching is to improve steel (A). A. hardness and abrasion resistance B. Impact toughness C. Plastic d. strength 6. The 345 in the steel Q345A means that the value of (C) is 345MPa. A. hardness b. impact toughness C. yield D 7. The sensing current refers to the minimum current that can be felt, and the communication is (). A. 0.1 mA b. 0.5 mA C. 1 ma d. 5 ma 8. For the environment with a high risk of drying and electric shock, the safety voltage stipulated in our country is (D). B. a. 2.5 V 12 V C. d. 24 v to 36 v 9. The electric arc heat generated by the gas conductivity is called (B). Electric arc welding C. Electron beam welding D. Laser welding 10. All kinds of inflammable and explosive items should be cleaned in the vicinity of the welding site (? C). A. 3m b. 5m c. 10m d. 15m 11. In the case of the bolt test, the thickness of the base plate is generally (B). A. 5 ~ 10mm B. 10 ~ 30mm c. 30 ~ 40mm d. 40 ~ 45mm In welding, the cataract is caused by the radiation of the arc (A). A. Infrared B C. visible light. Radiation 13. Most electrocution deaths are caused by (B). A. Burns b. electric shocks C. Arc