YUSHI INSTRUMENTS
34
When F1≥50
％
or F1/B1≥50
％（
B1
＜
100%
）
, the distance between the probe centers when F1 is
25% and F1/B1 is 50
％
is the length of defect pointer, and the probe center orbit is the defect edge.
When B1
＜
50
％
, the indicated defect length is the distance the probe center covers when B1 =
50%. The orbit of the probe center is the defect edge.
During the process of scanning and detecting, when any above situation occurs, take off the probe
and mark the boundary point with a marker pen. Then repeat this until other boundary points are
identified. (about 8 points will be adequate to identify the defect area)
6.1.6 the identification of the defect location
Identify the defect location by the position of the probe which detected flaws and mark the
workpiece. Then measure the minimum distance L1 between the left side of the steel plate and the flaw,
the minimum distance between the down side of the steel plate and the flaw, and the maximum indicated
length L3. Based on the figure, work out the defect area. See the picture below:
Fill in the figures tested :
number
L1
（
mm
）
L2
（
mm
）
L3
（
mm
）
S1
（
mm
2
）
The percentage of any 1×1
area
rating remarks
1
2
6.2 The application on the welding line flaw detection
The following figure should be recorded when detecting the flaws in welding lines
number
S1
S2
lengt
h
(L)
The distance between the flaw
and the welding line center
（
mm
）
q
The de
pt
h bet
w
een
the f
law
an
d t
he
w
el
di
ng l
ine
sur
face
（
mm
）
H
S3
The
val
ue
hi
g
her
than
the
quant
if
yi
ng l
ine
dB
（
A
m
ax
）
W
ave h
ei
ght
ar
ea
A
（＋）
B (
－
)
