大学MOOC Weldability of metals and alloys(Taiyuan University of Technology)1461340168 最新慕课完整章节测试答案

1

1、单选题：
​With carbon equivalent ( ), the steel has a low tendency to harden and cold cracking?​
选项：
A: less than 0.40%
B: less than 0.50%
C: less than 0.60%
D: less than 0.80%
答案: 【 less than 0.40%】

2、单选题：
‌( ) is not a factor that affects weldability.‌
选项：
A: chemical composition
B: Welding process
C: joint type
D: operation skill
答案: 【 operation skill】

3、单选题：
‍Maximum crack distance has been used to allow more accurate determination of the cracking ( ) range.‍
选项：
A: size
B:  temperature  
C: toughness
D: strength
答案: 【  temperature  】

4、多选题：
‍The calculation formula of carbon equivalent of the IWS  considers the influence of () on weldability.‌
选项：
A: diffusion hydrogen
B: welding process
C: welding structure
D: chemical composition
答案: 【 diffusion hydrogen;
welding process;
welding structure】

1

1、单选题：
‏The weldability of  high-carbon steel is worse than that of low-carbon steel because high-carbon steel is with ().‍
选项：
A: higher carbon content
B: higher toughness
C: higher sulphur content
D: lower melting point
答案: 【 higher carbon content】

2、单选题：
‎Normally, because of auto-tempering, the postweld microstructure of QTLA steel is ().‎
选项：
A: tempered martensite
B: upper bainite
C: high carbon martensite
D: ledeburite
答案: 【 tempered martensite】

3、单选题：
​HTLA steels are susceptible to reheat cracking because they are with a lot of ().‏
选项：
A: carbides
B: hydrogen
C: sulphur
D: manganese
答案: 【 carbides】

4、单选题：
‍If the carbon content of a type of steel is 0.1%, this steel is a kind of ().‏
选项：
A: low-carbon steel
B: medium-carbon steel
C: high-carbon steel
D: HTLA steel
答案: 【 low-carbon steel】

5、多选题：
‌QTLA steel is not susceptible to solidification cracking because it is with ().​
选项：
A: low carbon content
B: low impurity content
C: low manganese content
D: low nickel content
答案: 【 low carbon cont