Environmental Engineering Reference
In-Depth Information
Table 5.4
Detection of embedded discontinuities using different
techniques (weld No. 1)
Pore
3×1
Slag
5×5×20
TU
5×5
Slag
3×3×15
Pore
10
TU
5×10
TG
15
Method
Radiography
+
+
+
+
+
+
-
VNIIAES (YuTe)
-
+
+
-
-
+
+
VNIIAES (Bau-
man)
-
+
+
-
+
+
+
Sumiad (YuTE)
+
+
-
-
+
+
+
Slag
3×3×20
TG
15-17
Pore
3×10
TI
5×5
Slag
3×3×20
TI
20
Methods
Total
Radiography
+
+
-
+
+
-
10
VNIIAES (JT)
+
+
+
-
-
+
9
VNIIAES (Bau-
man)
-
+
+
+
-
+
9
Sumiad (YuTE)
+
+
+
+
+
+
11
5.13
Dependence of the detection of discontinuities on their length
in inspection by different methods: 1) radiography; 2) VNIIAES
(YuTE) 3) VNIIAES (Bauman Institute), 4) Sumiad (YuTe).
of defects. Table 5.5 and Fig. 5.14 summarise the inspection results. From
these results it follows that the highest total detectability of cracks, pores
and slag inclusions was observed in inspection by Sumiad equipment
where the overall detectability coefficient was
K
d
= 0.8. The excessive
rejection coefficients, listed in Table 5.5, are tentative and require further
verification. It is also noteworthy that, according to radiographic inspection,
all the detected discontinuities which were represented by cracks, were in
fact identified as slag. This can play a negative role in assessing the risk
of a defect.
Search WWH ::
Custom Search