2021大学慕课答案 Weldability of metals and alloys(Taiyuan University of Technology) 最新大学MOOC满分章节测试答案
本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-04-26到2021-08-30
本篇答案更新状态:已完结
1 Weldabitliy and Testing 1
1、 问题: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、 问题:( ) 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、 问题: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、 问题: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】
2 Weldability of Carbon and Low-alloyed Steels 1
1、 问题: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、 问题: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、 问题: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、 问题: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、 问题: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 content;
low impurity content】
6、 问题:For HTLA steels, chromium is able to ().
选项：
A:increase hardeness of HTLA steels
B:decrease toughness of HTLA steels
C:decrease hardeness of HTLA steels
D:increase toughness of HTLA steels
答案: 【increase hardeness of HTLA steels;
decrease toughness of HTLA steels】
7、 问题:Auto-tempering occurs after welding when ().
选项：
A:carbon content of weld is low
B:cooling rate is slow
C:peak temperature is high
D:Ms is high
答案: 【carbon content of weld is low;
cooling rate is slow】
8、 问题:When you weld HTLA steels, you’d better to take advantage of auto-tempering.
选项：
A:正确
B:错误
答案: 【错误】
9、 问题:Before designing welding procedure, we’d better to analyze the weldability of the workpiece.
选项：
A:正确
B:错误
答案: 【正确】
10、 问题:To remedy the underbead cracking, we need to reduce cooling rate when we weld oil engine connecting rod.
选项：
A:正确
B:错误
答案: 【正确】
3 Weldability of Stainless Steels 1
1、 问题:No preheating is recommended during wielding of duplex due to ()
选项：
A:coarse grain
B:deformation
C:the formation of sigma phase
D:the formation of ferrite phase
答案: 【the formation of sigma phase】
2、 问题:During welding of duplex steels, stay on the duplex road is very important, too slow cooling might lead to ( )
选项：
A:high austenite
B:high ferrite
C:formation of sigma phase
D:cracking
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