题目内容

Contents of () should be cared about.

A. H
B. V
C. Mo
D. S
E. 2-3-2
F. 期末

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() could be applied to decrease the possibility of hydrogen induced cracking for HTLA steels welding.

A. preheating
B. postweld heat treatment
C. cleaning the surface of workpiece
D. drying both workpiece and welding material before welding
E. 2-3-2
F. 期末

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Which region is next to the partially melted zone? ()

A. coarse grain zone
B. patially refining grain zone
C. refining grain zone
D. base metal
E. 2-1-1
F. 期末

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High-carbon steels are susceptible to hydrogen induce cracking because they are with high content of ().

A. carbon
B. sulphur
C. chromium
D. nickel
E. 2-1-2
F. 期末

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After welding, QTLA steels can be tempered automatically because they possess () martensite transformation starting temperature and the cooling rate is ()

A. high/slow
B. high/rapid
C. low/slow
D. low/rapid
E. 2-2-1
F. 期末

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Contents of () should be cared about.

A. H B. V C. Mo D. S E. 2-3-2 F. 期末

() could be applied to decrease the possibility of hydrogen induced cracking for HTLA steels welding.

Which region is next to the partially melted zone? ()

High-carbon steels are susceptible to hydrogen induce cracking because they are with high content of ().

After welding, QTLA steels can be tempered automatically because they possess () martensite transformation starting temperature and the cooling rate is ()

A. H
B. V
C. Mo
D. S
E. 2-3-2
F. 期末