When calculating the tensile strength of the Grade 3 butt weld, the design value of the tensile strength takes of that of the base material.
A. 50%
B. 70%
C. 85%
D. 90%
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In order to enable the weld to have a certain bearing capacity, the calculated length of the side fillet weld or the front fillet weld shall not be less than and 40 mm, and the calculated length of the weld equals to the weld length after deducting the length of arc initiation and arc retracting.
A. 8hf
B. 10hf
C. 12hf
D. 14hf
Test results indicated that the failure of the fillet weld often occur in the weld throat, so the effective thickness of fillet weld he is picked up which is along the direction of , and the effective area is the product of the effective thickness and the weld calculation length.
A. 30°
B. 45°
C. 60°
D. 75°
The surface of ordinary bolt is rough, and a large space exist between bolt bar and bolt hole, which may lead to a large shear slip.
A. Grade A
B. Grade B
C. Grade C
D. Grade D
The failure modes of ordinary bolts include: when the diameter of the bolt is small and the plate is thick, the bolt may be .
A. cut off
B. crushed down
C. split by tension
D. damaged by bending