UTInternal Quality Evaluation Technique by Phased Array UT for Large

Monoblock Rotor Shaft Forging

*Hiroki Nimura

*Nobuyuki Hoshi

*Hajime Yoshida

*Hideaki Narigasawa

* Muroran Plant

89

UT

UT VGB UT UT UT UT UT

For large monoblock rotor shaft forging, the detectability of indications by Conventional UT cannot always satisfy the requirement due to the long beam path. In addition it takes much time to conduct the inspection in accordance with some inspection specifications such as the VGB standard, which requires several angle beam methods in addition to the straight beam method. The characteristics of Phased Array UT technique, namely, zone focusing and sector scan are effective to solve the above problems. Investigations regarding the optimal testing conditions of Phased Array UT were performed and we have established the internal quality evaluation technique for large monoblock rotor shaft forging by Phased Array UT technique with an automated UT system. As a result, the detectability of indications and efficiency of inspection have been improved compared with Conventional UT, and we have confirmed that large monoblock rotor shaft forging can be inspected more reliably and accurately by this evaluation technique.

1.

3,200 mm UT 0.9 mm

UT

UT GE

Synopsis

1 UT -1

2 UT -2

3 /DYNARAY

4 /QUAD

90No.652014.10

UT

VGB 7, 14, 21, 281

UTPA-UT

1 PA-UT 1 UT PA-UT

2 PA-UT 2

PA-UT

2.

UT PA-UT

10.9 mm EFBH1.6 mm EFBH

2 7, 14, 21, 28

UT UT 2,800 mm

3.

1 DYNARAY128/128PR 3 ZETEC

2 QUAD 4 ZETEC IMASONIC /2 MHz /128 324

/64 mm x 64 mm

5

6 UT UT

91

UT

4.

4.14.1.1

PA-UT 5 UT PA-UT 1,294 mm 1.6 mm FBH 6 1.6 mm FBH SN S/N UT 2 PA-UT 20

PA-UT UT 10

4.1.2 2,800 mm

UT PA-UT

10.9 mm EFBH1.6 mm EFBH

2

PA-UT 2

4.1.3

5 5 7 5 mm 1,294 mm 1.6 mm FBH

8 3 25 mm 1,294 mm 0.9 mm FBH 2,740 mm1.6 mm FBH 1.6 mm FBH 9 10 25mm

7

8

9

10

1

2

11

1: 1.6mmFBH 4.0mm

92No.652014.10

UT

4.2

7, 14, 21, 281.6mm FBH 50mm, 500mm, 1,000mm 4.0mm SDH

1 11 0 28 -5.0 dB 1.6 mm FBH 4.0 mm SDH 7 28

2 UT 50 mm 1.6 mm FBH

12-6 dB

15 MDFS

14

13 UT TUROMAN5

93

UT

4.3PA-UT UT

UT UT -6 dB -6 dB 1/2 3 -6 dB1.6 mm FBH

12 -6 dB 50 mm 7.5 mm15 mm 7 mm -6 dB 1 UT 7.5 mm 7 mm

5.

UT

12,811 mm2 / 3 /8 728,

3 / 7 mm0.2/ 100 mm/sec

4 UT UT TUROMAN5/Actemium Cegelec 13

UT 14 MDFS 15 PA-UT UT 7, 14, 21, 28 UT 9 PA-UT 1 1/9 UT 90%

94No.652014.10

UT

6.

UT UT UT

1 3

UT25 mm 0.9 mm EFBH 1.6 mm EFBH UT

2 1

1.6 mm EFBH UT 50 mm1.6 mm EFBH

3 7, 14, 21, 28

2 UT UT 1/9 90%