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The weldability of high-carbon steel is worse than that of low-carbon steel because high-carbon steel is with ( ). A:higher carbon content B:lower melting point C:higher sulphur content D:higher toughness 答案: higher carbon contentNormally, because of auto-tempering, the postweld microstructure of QTLA steel is ( ). A:high carbon martensite B:tempered martensite C:ledeburite D:upper bainite 答案: tempered martensite
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With carbon equivalent ( ), the steel has a low tendency to harden and cold cracking?
A:less than 0.50%
B:less than 0.80%
C:less than 0.60%
D:less than 0.40%
答案: less than 0.40%
( ) is not a factor that affects weldability.
A:operation skill
B:chemical composition
C:joint type
D:Welding process
答案: operation skill
The calculation formula of carbon equivalent of the IWS considers the influence of () on weldability.
A:chemical composition
B:diffusion hydrogen
C:welding process
D:welding structure 
答案: diffusion hydrogen,welding process,welding structure 
Maximum crack distance has been used to allow more accurate determination of the cracking ( ) range.
A:strength
B:toughness
C:size
D:temperature
答案: temperature
Weldability is not easily quantified, and can depend on a variety of factors, including ( ).
A:operator and welder
B:physical specifics of the joint
C:welded structure
D:welding method
答案: physical specifics of the joint,welded structure,welding method
The weldability of high-carbon steel is worse than that of low-carbon steel because high-carbon steel is with ( ).
A:higher carbon content
B:lower melting point
C:higher sulphur content
D:higher toughness
答案: higher carbon content
Normally, because of auto-tempering, the postweld microstructure of QTLA steel is ( ).
A:high carbon martensite
B:tempered martensite
C:ledeburite
D:upper bainite
答案: tempered martensite
QTLA steel is not susceptible to solidification cracking because it is with ( ).
A:low impurity content
B:low carbon content
C:low manganese content
D:low nickel content
答案: low impurity content,low carbon content
For HTLA steels, chromium is able to ( ).
A:decrease toughness of HTLA steels
B:increase toughness of HTLA steels
C:increase hardeness of HTLA steels
D:decrease hardeness of HTLA steels
答案: decrease toughness of HTLA steels,increase hardeness of HTLA steels
When you weld HTLA steels, you’d better to take advantage of auto-tempering.
A:对
B:错
答案: 错
Auto-tempering occurs after welding when ( ).
A:peak temperature is high
B:Ms is high
C:carbon content of weld is low
D:cooling rate is slow
答案: carbon content of weld is low,cooling rate is slow
Before designing welding procedure, we’d better to analyze the weldability of the workpiece.
A:对
B:错
答案: 对
To remedy the underbead cracking, we need to reduce cooling rate when we weld oil engine connecting rod.
A:错
B:对
答案: 对
If the carbon content of a type of steel is 0.1%, this steel is a kind of ( ).
A:medium-carbon steel
B:HTLA steel
C:high-carbon steel
D:low-carbon steel
答案: low-carbon steel
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