题目内容

Normally, we'd better pay more attention to () when we weld plain carbon steels.

A. solidification cracking
B. hydrogen induced cracking
C. toughness decrease
D. reheat cracking
E. 2-1-2
F. 期末

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Normally, heat treatment for QTLA steels including ().

A. austenitizing
B. quench
C. temper
D. anneal
E. 2-2-1
F. 期末

Auto-tempering makes postweld microstructure of QTLA steels () increase.

A. plasticity
B. toughness
C. hardness
D. strength
E. 2-2-1
F. 期末

For QTLA steels, toughness decrease may occur in () after welding.

A. fusion zone
B. HAZ
C. base metal
D. nowhere
E. 2-2-2
F. 期末

() may occur in weldments of QTLA steels after welding if cooling rate is too slow.

A. auto-tempering
B. upper bainite
C. M-A constituents
D. softening
E. 2-2-2
F. 期末