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c. 增加传播速度(increase travel speed)

d. 从横向摆动焊道改成直线焊道技术(change from weave to stringer bead technique) e. 所有以上述的(all of the above)

Q8-10 预热的应用将(The use of preheat will tend to:)

a. 引起更大面积的热影响区(result in a wider heat-affected zone)

b. 产生一个低的热影响区的硬度(produce a lower heat-affected zone hardness) c. 降低冷却速度(slow down the cooling rate)

d. 在热影响区减少产生马氏体的趋势(reduce the tendency to produce martensite in the

heat-affected zone)

e. 所有上述的(all of the above)

Q8-11 下列哪些改变会要求附加或增加预热(Which of the following changes will warrant an addition or increase in required preheat?) a. 减少碳当量(decreased carbon equivalent) b. 减少碳当量(increased carbon equivalent) c. 增加母材厚度(increased base metal thickness) d. 上述a和b(a and c above) e. 上述b和c(b and c above)

Q8-12 把一部件保持在奥氏体化温度下一段时间并在炉中缓慢冷却的热处理是什么(What heat treatment is characterized by holding the part at the austenitizing temperature for some time and then slow cooling in the furnace?) a. 正火(normalizing) b. 淬火(quenching) c. 退火(annealing) d. 回火(tempering) e. 应力消除(stress relief)

Q8-13把一部件保持在奥氏体化温度下一段时间并在静空气中缓慢冷却的热处理是什么What heat treatment is characterized by holding the part at the austenitizing temperature for some time and then cooling in still air? a. 正火(normalizing) b. 淬火(quenching) c. 退火(annealing) d. 回火(tempering) e. 应力消除(stress relief)

Q8-14 钢在低于质变温度上加热将改变显微结构排列。这个温度是(Steel heated above the lower transformation temperature (A1) will change microstructural alignment. This temperature is: ) a. 1333?F

b. 933?F c. 1560?F d. 3600?F

e. 无以上任何一个(none of the above) Q8-15 Atoms in the solid (frozen) state: a. have a specific “home” position b. have no distinct structure

c. are essentially fixed in a definite structured position d. a and c above e. none of the above

Q8-16 在以每分钟5英吋传播速度,25伏和100安培下,一个熔化的焊接熔池的热输入是多少 (What is the heat input for a molten weld pool at 5 ipm travel speed, 25 volts, and 100 amperes?) a. 300 J/in. b. 300,000 J/in. c. 30,000 J/in. d. 3.633 J/in

e. 无以上任何一个(none of the above)

Q8-17 原子可以加入至一纯金属形成合金的方法是(One way that atoms are added to a pure metal to form an alloy is: ) a. 锤击(peening)

b. 替代(substitutionally) c. 自动(automatically) d. 固化(solidification) e. 蔓延(diffusion)

Q8-18 碳加入钢表面以增加硬度的工艺是(The process where carbon is added to the surface of a steel to harden it is:) a. 脱碳(decarburization) b. 压缩渗碳(pack carburizing) c. 沉淀加硬(precipitation hardening) d. 淬火(quenching)

e. 无以上任何一个(none of the above)

Q8-19 钢存在于下列哪种结晶结构中(Steel exists in which of the following crystal structures?) a. 体心四方晶格(BCT ) b. 面心立方(FCC) c. 体心立方(BCC)

d. 所有上述的All of the above

e. 六角形密集(HCP)

Q8-20 下列哪种热处理通常跟在淬火后Which of the following usually follows quenching?

a. 回火(tempering)

b. 应力消除(stress relieving) c. 正火(normalizing) d. 退火(annealing)

e. 无以上任何一个(none of the above)

Q8-21 下列哪种处理可以既用热技术也可用机械技术完成(Which of the following can be accomplished using either thermal or mechanical techniques?) a. 退火(annealing) b. 回火(tempering) c. 锤击(quenching)

d. 应力消除(stress relieving) e. 无以上任何一个(none of the above)

Q8-22 下列哪种处理会造成碳钢处在最软状况(Which of the following results in the softest condition for carbon steel?) a. 退火(annealing) b. 锤击(quenching)

c. 应力消除(stress relieving) d. 回火(tempering) e. 正火(normalizing)

Q8-23 一个含有0.16%碳,0.84%的锰,0.09%的镍,0.25%铬,0.052铜和0.40%钼的钢,其碳当量是多少?(For a steel having a chemistry of : 0.16% carbon, 0.84% manganese, 0.09% nickel, 0.25% chromium, 0.052% copper, and 0.40% molybdenum, what is its Carbon Equivalent?)

(CE=%C + %Mn/6 + %Ni/15 + %Cr/5 + %Cu/13 + %Mo/4) a. 0.23 b. 0.34 c. 0.37 d. 0.41 e. 0.46

Q8-24 至少含有百分这几的铬可以称为不锈钢?(Stainless steels are defined as having at least what percent chromium?) a. 7% b. 12% c. 15% d. 20%

e. 30%

Q8-25 奥氏体不锈钢的敏化或碳化物的沉淀可以由下列哪些方法减少?(Sensitization, or carbide precipitation, of austenitic stainless steels can be reduced by which of the following methods?)

a. 溶液调整,水锤击(solution annealing, water quenching)

b. 使用包含钛或铌(钶)的稳定的等级(using stabilized grades containing titanium or niobium (columbium))

c. 使用不锈钢的低碳等级(using the low carbon grades of stainless steels) d. 所有上述的(all of the above)

e. 使用高碳不锈钢(using high carbon stainless steels)

Q8-26 金属必须被熔化到扩散出现(Metals must be molten for diffusion to occur.) a. 真(true) b. 假(false)

Q8-27 氢在室温下扩散到一固体金属中去(Hydrogen can diffuse into a solid metal at room temperature) a. 真(true) b. 气(false)

Q8-28 当二种金属均在固体状态下,二者可以相互溶解(Metals can dissolve into each other when both are in the solid form.) a. 真(true) b. 假(false)

Q8-29 氮是靠哪个工艺溶入到碳钢表面(The process whereby nitrogen is dissolved into the surface of carbon steel is: ) a. 敏化(sensitization) b. 氮迁移(nitrogen removal) c. 碳化(carburizing) d. 渗氮(nitriding)

e. 无以上任何一个(none of the above)

Q8-30 焊接冶金学是有关金属在焊接期间的变化的学课(Welding metallurgy is concerned with the changes in the metals during welding.) a. 真(true) b. 假(false)

American Welding Society & Moody International China Welding Inspection Technology Workbook 焊接检验技术手册 Module 9 第9单元

Weld and base metal discontinuities 焊缝与母材的不连续