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
查看答案
() 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
High content of vanadium possibly increase susceptibility of HTLA steels to ().
A. hydrogen induced cracking
B. reheat cracking
C. softening
D. solidification cracking
E. 2-3-2
F. 期末
Normally, we'd better pay more attention to hydrogen induced cracking when () are welded by SMAW.
A. plain high carbon steels
B. QTLA steels
C. HTLA steels
D. plain low carbon steels
E. 2-1-2 2-2-2 2-3-2
F. 期末
Effects of Mo in HTLA steels include ().
A. improving hardenability
B. improving tempering stability
C. decreas grain size
D. decreas temper embrittlement
E. 2-3-1
F. 期末
微信支付 
支付宝支付