Quytrinhhan Ong AP Luc 1558

Nh Thu Lilama 45.4

Cng Trnh Thy in ng Nai 3 & 4

QUY TRNH K THUT HN1. CC QU TRNH HN V MI HN P DNG Hn h quang chm (SAW) v hn h quang que hn kim loi c bc thuc (SMAW) s c p dng.

1.1 Qu trnh hn

1.2 Mi hn p dngMii qu trnh hn s p dng cho mi ni hn sau: 1.2.1. Hn h quang chm (SAW)

a. Mi hn dc cho ng thng, ng cn gim, ng khu cong ti bi gia cng. b. Mi hn chu vi cho ng thng ti bi gia cng.1.2.2. Hn h quang que hn kim loi c bc thuc (SMAW)

a. Mi hn chu vi cho ng cong, ng cn gim, v ng khu cng. b. Mi hn ai cng cho ng ng p lc hay ng lt thp. c. Mi hn gia g lp vi ng p lc. d. Tt c mi hn ti cng trnh lp t.2. 2.1 THIT B HN Thit b hn ti xng v ti cng trnh lp t nh sau: Ti xng

Danh mc My hn SAW My hn mt chiu DC T sy que hn T sy thuc hn Ga hn t ng My nn kh 2.2 Ti cng trnh lp t

Cng sut 1000A 400A 100kg 500kg 30tn 8 kg/cm2

S lng 2 10 01 01 04 01

Ghi ch

Danh mc My hn su m (mt chiu Quy Trnh K Thut Hn

Cng sut 1000A

S lng 04

Ghi ch

Trang 1/ 21

Nh Thu Lilama 45.4 DC) T sy que hn My nn kh 3. 3.1.1 VT LIU Cp v k hiu 100kg kg/cm2


02 02

3.1. Vt liu chnh

K hiu cp SM 490, Q345 SM 570, Q460 3.1.2 c tnh c hc

K hiu SM50 SM 58

Ap dng Thp tm, cun, on Thp tm, cun, on

K hiu cp SM 490, Q345 SM 570, Q460

Gii hn chy N/mm2

bn ko N/mm2

gin di % 21-23 20-26

295-325 430-460

490-610 570-720

3.2 Vt liu hn3.2.1. Thng hiu vt liu hn Vt liu hn bng di y s c p dng 3.2.1.1 Hn h quang chm (SAW)

Vt liu SM490, Q345 SM 570, Q460

Loi JIS Z3183 S502H JIS Z3183 S584H

Thng hiu MF-38/US-36 KOBELCO hoc tng ng MF-38/US-49 KOBELCO hoc tng ng

3.2.1.2. Hn h quang que hn kim loi c bc thuc (SMAW)

Vt liu SM490, Q345 SM 570, Q460 Quy Trnh K Thut Hn

Loi JIS Z3212 D5016 JIS Z3212 D5816

Thng hiu LB-52 KOBELCO hoc tng ng LB-62 KOBELCO hoc tng ng Trang 2/ 21

Nh Thu Lilama 45.4


Ti liu k thut v chng ch cht lng cho que hn LB-52 v LB-62 s c cp khi kim tra trc khi tin hnh cng tc hn ti xng ch to. 3.2.2 Sy nng vt liu hn Que hn v thuc hn s c sy li trc khi hn ph hp theo bng di. 3.2.2.1. Thuc hn cho SAW

Thng hiu MF-38 3.2.2.2. Que hn

Nhit 0C 200-350

Thi gian (gi) 2

S ln 1

Nhit 0C 125-175

Thng hiu LB-52 LB-62 3.2.3 Phng php

Nhit 0C 350-400 350-400

Thi gian (gi) 1 1

S ln 2 2

Nhit 0C 125-175 125-175

Que hn v thuc hn cho SAW s sy vi nhit v thi gian quy nh trc khi s dng. Thi gian cho php ngi nhit bnh thng Que hn s c gi trong l in, sau khi ly ra khi l sy s dng. S lng mang ra phi c hn ch t nht 1 gi trong ng hm, 2 gi xng thi cng. Que hn ly ra qu thi gian cho php s mang sy tr li. Thi gian cho php ngi nhit bnh thng ti a l 3 gi. 4. 4.1. PHNG PHP GIA NHIT Gia nhit c tin hnh trc khi hn nh sau: Phng php gia nhit t nng bng gas: - Cc mi hn dc - Cc mi hn chu vi ti xng - Cc mi hn chng, hn ni ca ming lt - Cc mi hn nh vo ng - Cc mi hn khc trong ng hm 4.2 Nhit gia nhit s ph hp vi tiu chun k thut cho ca van v ng ng p lc n v 0C

.2.4

4.2.1 Hn h quang chm (SAW)

dy

Vt liu chnh

Quy Trnh K Thut Hn

Trang 3/ 21

Nh Thu Lilama 45.4

Cng Trnh Thy in ng Nai 3 & 4 SM 490, Q345 SM 570, Q460 40 800C 80 1000C 80 1500C

t 25 25 t 38 38 t 4.2.2 Hn h quang kim loi (SMAW)

NA 40 800C 80 1000C n v 0C

dy t 25 25 t 38 38 t

Vt liu chnh SM 490, Q345 NA 40 800C 80 1000C SM 570, Q460 40 800C 80 1000C 80 1500C

4.2.3. Thi cc than

dy t 25 25 t 38 38 t

Vt liu chnh SM 490, Q345 NA 40 800C 80 1000C SM 570, Q460 40 800C 80 1000C 80 1500C

4.3.

nhit (post heating) Bnh thng khng cn nhit tr khi p dng cho vic sa cha mi hn cho vt liu SM570 hoc Q460. Trong trng hp chp X quang kim tra mi hn sau 24 gi, thi gian nhit t nht 2 gi mc nhit l 1500C bng phng php t ga.

4.4.

Nhit -interpass Nhit interpass nm trong khong gia nhit gia nhit ti thiu quy nh v 1001500C.

4.5.

Kim st nhit Nhit gia nhit s c kim st bng phn nhit, que th cho qu trnh gia nhit t nng bng ga. Nhit interpass s c kim tra bng phn nhit, que th. Chiu rng gia nhit s khng c nh hn 4 ln so vi dy ca tm m (ti a 100mm) trn mi cnh ca mi hn.

Quy Trnh K Thut Hn

Trang 4/ 21

Nh Thu Lilama 45.4 5. 5.1 5.1.1 HN H QUANG CHM Cc bc hn ng nMai lam sach cac canh Moi han doc G.nhit G nhit


u ni cc cnh Thoi cc than ben ngoai

Han nh Han ng doc

nh cac mieng nh

G.nhit

G. nhit

i vi cc tm m dy, s hn t bn trong ra bn ngi ch gim ti thiu bin dng gc do qu trnh hn, nu cn thit. 5.1.2. T hp ng (Ni 2 ng n)Gia nhit Gia nhit Hn nh

Mi lm sch cc cnh

u ni cc cnh

Hn ni vng ngoi

Gia nhit

Thi cc than bn ngoi

Gia nhit

Hn ni chu vi trong

5.2.

Quy cch chung cho hn h quang chm Khi thc hin hn h quang chm, ng n v t hp ng s t trn gi hn.

5.2.1. Gi hn 5.2.2. Lm sch cnh Trc khi tin hnh hn, cnh s c v sinh sch bng my mi, chi st, hay cc dng c khc. Cc tp cht nh du, m, bi, sng nh hng n hn s c lm sch bng t nng nhit. 5.2.3. Dung sai cc cnh Cc b phn c hn phi c lp v cn chnh chnh xc trc khi hn. Dung sai cho vic cn chnh mi ni b mt trong ca ng nh sau:

- Mi hn dc: 5% hoc nh hn dy, tuy nhin nu chiu dy tm 20m thdung sai l 1mm.

- Mi hn chu vi: 10% hoc nh hn dy, tuy nhin nu chiu dy tm 15mm thdung sai l 1.5mm. h chn cho mi ni khong 1mm hoc nh hn, h cho vt p y l 1mm hoc nh hn. 5.2.4. Hn nh Mi hn nh di hn 80mm, v ng hn 300-400mm. Mi hn nh rnh ngi c mi hn dc v mi hn vng. 5.2.5. Vt nh Quy Trnh K Thut Hn Trang 5/ 21

Nh Thu Lilama 45.4


Vt nh c gn cho mi hn dc c hai u ca mi hn. Hn s bt u v kt thc trn cc vt nh ny. Vt nh s lm bng mt vt liu nh nhau, dy v cnh ging nhau.

200

150

.Vt nh ct bng ga v chun b cnh cho mi hn chu vi. Tho b vt nh tm s c thc hin ging nh chc nng ca vt nh. Cc cnh vt nh cng c v sinh sch nh mi hn. 5.3. Hn iu kin hn c bn c th hin nh sau:

QUY TRNH HN (WPS) No. 01TN CNG TY: CNG TY C PHN LILAMA 45.4 D N: D n Thy in ng Nai 3&4 QUY TRNH HN S: 01 NGY: P DNG QUY TRNH NH GI CHT LNG HN QU TRNH HN : SMAW + SAW LOI: BNG TAY + T NG P DNG TIU CHN : ASME IX NGI LP : Quy Trnh K Thut Hn Trang 6/ 21

Nh Thu Lilama 45.4 MI (QW-402) Mi ni thit k: Kiu X Phng php p: C Loi hn: SMAW 30o 20-38 a 2*

Cng Trnh Thy in ng Nai 3 & 4 b c

* : kch thc s c ly thc t theo ch dn trn bn v thit k, ch to. a,b, c : l kch thc khe h v kch thc mi hn c ly theo bn v ch to.

VT LIU CHNH (QW-403) Tiu chun k thut & cp : SM570 (Q460) Chiu dy: 20 38mm ng knh ng: Tt c Nhng vt liu khc: NA VT LIU P(QW-403) Qu trnh hn: SMAW Tiu chun (SFA) JIS Z3212 JIS No. D5816 C vt liu p: 4mm Nhn mc que hn: KOBECO LB-62 V TR (QW-405) V tr rnh: 1G Hn chui NA Nhng v tr khc : NA NHIT (QW 406) Gia nhit trc khi hn: 40 oC Nhit interpass: 100-150oC X L NHIT HN (QW -407) Nhit : NA Thi gian: NA GAS ( QW-408) Loi : NA Nng phn trm: NA T l dng chy: NA C TNH IN (QW 409) Dng in: DC Cc: DC-EP Ampe: xem bng Vn: xem bng C que hn: 4mm Loi khc : NA K THUT (QW410) Tc chy: Xem bng chy nh git: Chun b v v sinh : My mi, chi st c li rnh: C Nhiu lp hay n lp : Nhiu lp Nhiu dy hay n dy: n

SAW JIS Z3183 JIS S584-H 4mm KOBELCO. MF-38/US-49,

Quy Trnh K Thut Hn

Trang 7/ 21

Nh Thu Lilama 45.4 Vt liu p Loi ng knh mm D5816 4 S584-H 4 S584-H 4 S584-H 4 S584-H 4

Cng Trnh Thy in ng Nai 3 & 4 Dng in Loi Ampe cc DC-EP DC-EP DC-EP DC-EP DC-EP 110-170 480-600 500-620 500-620 500-600 Tc dng (cm/min) 7-10 25-40 30-40 30-40 30-40

Lp hn Bi Lp 1 Lp 2 Lp 3 Lp cui

Loi hn SMAW SAW SAW SAW SAW

Vn 18-24 24-28 26-32 26-32 26-35

Hn s c tin hnh theo iu kin tiu chun c bn trong tt c cc trng hp. Nu trong trng hp m iu kin hn khc vi iu kin c bn th ngun nhit hn ti a s nm trong gi tr quy nh ca iu kin hn c bn. 5.4 Thi cc than Mi hn dc v mi hn chu vi s c c li rnh theo quy trnh thi cc than nh sau: 5.4.1. Thi cc than kh h quang s tin hnh bng my hn DC 500A hoc cng sut ln hn. Kch thc que hn 6~13mm. 5.4.2. Vic thi cc than s thc hin trnh t trn mt hn i din sao cho nhit ca mi hn cao hn nhit gia nhit. Nhit gia nhit s c kim tra bng phn nhit. 5.4.3. Cc bon ca que hn v x hn s khng cn trn b mt rnh vt (rnh sau khi thi cc than). 5.4.4. B mt rnh vt s c lm bng v kim tra khng cn khuyt tt. B mt rnh vt s c kim tra bng MT khi cn thit. 5.4.5. Hnh dng rnh s thch hp hn v bo v trnh khuyt tt. Bn knh y ca rnh vt khong 6mm hoc ln hn. 6. 6.1. HN H QUANG QUE HN KIM LOI C BC THUC Tng qut Trc khi hn, cc g cnh s c lm sch bng my mi, chi st hoc cc dng c thch hp khc. Tp cht nh du m, s, bi, sng nh hng n mi hn s loi b bng phng php t nng. 6.1.2. Dung sai ca cnh Cc b phn c hn phi c lp v canh chnh chnh xc trc khi hn. Dung sai cho vic canh chnh mi ni b mt trong ca ng nh sau:

6.1.1. V sinh g cnh

- Mi hn dc: 5% hoc nh hn dy, tuy nhin nu dy 20mm th dung sail 1mm.

- Mi hn vng: 10% hoc nh hn dy, tuy nhin nu dy 15mm th dungsai l 1.5mm. h chn cho mi ni khong 1mm hoc nh hn, h cho vt p y l 1mm hoc nh hn. Kch thc dung sai nh sau:

- Khe h: 1mm - Gc vt: 5 oC6.1.3. Lp th 2 v cc lp tip theo s c hn sau khi loi b s trn b mt ng hn c. Quy Trnh K Thut Hn Trang 8/ 21

Nh Thu Lilama 45.4


6.1.4. iu kin hn s c iu khin bng k thut hn, dng in hn, chiu di h quang sao cho vic chy nh git khng ph hp, chng ln nhau, ngm X s khng xy ra. 6.1.5. La h quang s c bt u trong rnh hoc trn tm vt liu khc, khng c php hn nu la h quang pht ra trn tm thp khc so vi pha trong rnh ng hn. 6.2. Hn nh 6.2.1. Que hn nh phi cng loi vi que hn s dng cho vic hn. 6.2.2. Mi hn nh di hn 80mm chiu dc v ng hn l 300 mm 400mm trong hu ht cc trng hp. 6.2.3. Chiu dy ca mi hn nh trong rnh vt s c kch c l 6mm. Kch c cu mi hn nh cho vt liu p s l 4mm v ln hn chiu di chn.

6.2.4.

Trc khi hn nh vic gia nhit s uc thc hin trn khu vc khong 100mm quanh ch c hn.

Nhit gia nhit s cao hn khong 30oC so vi mc nhit ti thiu c quy nh p dng cho loi hn SMAW.

6.2.5. 6.2.6.

Hn nh cho nhng mi ni u u s c thc hin pha bn ngi rnh v dng phng php thi cc than ty b. Hn nh s c thc hin bng cc th hn c tay ngh v cng l th hn hn hn thin sau khi hn nh, ngi th hn phi xc nhn l c vt nt b mt hay khng.

6.3.

Hn

6.3.1. Hnh dng cnh v iu kin hn (dng in, vn, tc v ngun vo nhit hn) nh sau:

QUY TRNH HN (WPS) No. 02TN CNG TY: CNG TY C PHN LILAMA 45.4

D N: Thy in ng Nai 3&4 QUY TRNH HN S: No 02 NGY: P DNG QUY TRNH NH GI CHT LNG HN QU TRNH HN: SMAW LOI: BNG TAY P DNG TIU CHN: ASME IX NGI LP: MI HN(QW-402) Mi ni thit k: Kiu Phng php p: NAa T1 b T2

- T1, T2 : l chiu dy ca thp dn hng v thp lt ng ng p lc cho tng phn on ng tng ng c ly theo bn v thit k, ch to. - a,b : l kch thc mi hn c ly theo bn v thit k, ch to.

Quy Trnh K Thut Hn

Trang 9/ 21

Nh Thu Lilama 45.4 VT LIU CHNH (QW-403) Tiu chun k thut & cp : SM570 (Q460) Chiu dy: 20 38mm ng knh ng: NA Nhng vt liu khc: NA VT LIU P(QW-404) Qu trnh hn: SMAW Tiu chun JIS Z3212 JIS No. D5816 C vt liu p: 4mm Nhn mc que hn: KOBELCO LB-62 iu kin kh (nhit ): 350-400 oC Thi gian 1 gi V TR (QW-405) V tr rnh: 2F Hn chui: Ln Nhng v tr khc : NA NHIT (QW 406) Gia nhit trc khi hn: 50 oC Nhit interpass: Max 300oC X L NHIT HN (QW -407) Nhit : NA Thi gian: NA GAS ( QW-408) Loi : NA Nng phn trm: NA T l dng chy: NA C TNH IN (QW 409) Dng in: DC Cc: DC-EP Ampe: xem bng Vn: xem bng C que hn: 4mm Loi khc: NA K THUT (QW410) Tc chy: Xem bng chy nh git: Chun b v v sinh : My mi, chi st c rnh li: C Nhiu lp hay n lp: Nhiu lp Nhiu dy hay n dy: n Vt liu p Loi ng knh mm D5816 4 D5816 4 D5816 4 D5816 4 D5816 4


Lp hn Lp 1 Lp 2 Lp 3 Lp Lp cui

Loi hn SMAW SMAW SMAW SMAW SMAW

Dng in Loi cc Ampe DC-EN DC-EP DC-EP DC-EP DC-EP 110-140 110-170 110-170 110-170 110-170

Vn 18-24 20-24 20-24 20-24 20-24

Tc dng (cm/min) 7-10 9-15 9-15 9-15 9-15

Quy Trnh K Thut Hn

Trang 10/ 21

Nh Thu Lilama 45.4


QUY TRNH HN (WPS) No. 03TN CNG TY: CNG TY C PHN LILAMA 45.4

D N: Thy in ng Nai 3&4 QUY TRNH HN S: No. 03 NGY: P DNG QUY TRNH NH GI CHT LNG HN QU TRNH HN: SMAW LOI: BNG TAY P DNG TIU CHN: ASME IX NGI LP: MI HN (QW-402) Mi ni thit k: Kiu T T1 Phng php p: NA b a c T2 - T1, T2 : l chiu dy ca thp gn tng cng v thp lt ng ng p lc cho tng phn on ng tng ng c ly theo bn v thit k, ch to. - a,b, c : l kch thc khe h v kch thc mi hn c ly theo bn v thit k, ch to. VT LIU CHNH (QW-403) Tiu chun k thut & cp : SM570 (Q460) Chiu dy: 20 38mm ng knh ng: NA Nhng vt liu khc: NA VT LIU P(QW-404) Qu trnh hn: SMAW Tiu chun JIS Z3212 JIS No. JISD5816 C vt liu p: 4mm Nhn mc que hn: KOBELCO LB-62 iu kin kh (nhit ):350-400 oC Thi gian 1 gi V TR (QW-405) V tr rnh: 2F-4F Hn chui: Ln Nhng v tr khc: NA NHIT (QW 406) Gia nhit trc khi hn: 50-100oC Nhit interpass: Max 300oC X L NHIT HN (QW -407) Nhit : NA Thi gian: NA GAS ( QW-408) Loi : NA Nng phn trm: NA T l dng chy: NA C TNH IN (QW 409) Dng in: DC Cc: DC-EP Quy Trnh K Thut Hn Trang 11/ 21

Nh Thu Lilama 45.4 Ampe: xem bng Vn: xem bng C que hn: 4mm Loi khc : NA K THUT (QW410) Tc chy: Xem bng chy nh git: Chun b v v sinh: My mi, chi st c rnh li: C Nhiu lp hay n lp: Nhiu lp Nhiu dy hay n dy: n Vt liu p Lp hn Loi hn Loi ng knh mm Lp 1 SMAW D5816 4 Lp 2 SMAW D5816 4 Lp 3 SMAW D5816 4 Lp SMAW D5816 4 Lp cui SMAW D5816 4


Dng in Loi cc Ampe

Vn

Tc dng (cm/min)

DC-EN DC-EP DC-EP DC-EP DC-EP

110-140 110-170 110-170 110-170 110-170

18-24 20-24 20-24 20-24 20-24

7-10 9-15 9-15 9-15 9-15

QUY TRNH HN (WPS) No.04TN CNG TY: CNG TY C PHN LILAMA 45.4

D N: Thy in ng Nai 3&4 QUY TRNH HN S : No:04 NGY: P DNG QUY TRNH NH GI CHT LNG HN QU TRNH HN : SMAW LOI : BNG TAY P DNG TIU CHN : ASME IX NGI LP : MI HN (QW-402) Mi ni thit k: Kiu V Phng php p: CT1 a

120T2 T3

b

c

- T1, T2, T3 : l chiu dy ca thp ng ng p lc v vnh dn hng tng ng cho tng phn on ng theo bn v thit k, ch to. - a,b, c : l kch thc khe h v kch thc mi hn c ly theo bn v thit k, ch to.

Quy Trnh K Thut Hn

Trang 12/ 21

Nh Thu Lilama 45.4 VT LIU CHNH (QW-403) Tiu chun k thut & cp : SM570 Q(460) Chiu dy: 20 38mm ng knh: NA Nhng vt liu khc: NA VT LIU BI (QW-404) Qu trnh hn: SMAW Tiu chun JIS Z3212 JIS No. JISD5816 C que hn 4mm Nhn mc que hn: KOBELCO LB-62 iu kin kh (nhit ):350-400 oC Thi gian 1 gi V TR (QW-405) V tr rnh: 5F Hn chui: Ln Nhng v tr khc NA NHIT (QW 406) Gia nhit trc khi hn: 50-100oC Nhit interpass: max 300oC X L NHIT HN (QW -407) Nhit : NA Thi gian: NA GAS ( QW-408) Loi : NA Nng phn trm: NA T l dng chy: NA C TNH IN (QW 409) Dng in: DC Cc: DC-EP Ampe: xem bng Vn: xem bng C que hn: 4mm Loi khc : NA K THUT (QW410) Tc chy: Xem bng chy nh git: Chun b v v sinh : My mi, chi st c rnh li: C Nhiu lp hay n lp: Nhiu lp Nhiu dy hay n dy: n Vt liu p Lp hn Loi hn Loi ng knh mm Lp 1 SMAW D5816 4 Lp 2 SMAW D5816 4 Lp SMAW D5816 4 Lp cui SMAW D5816 4 6.3.2


Dng in Loi cc Ampe DC-EN DC-EP DC-EP DC-EP 110-170 110-170 110-170 110-170

Vn 18-24 20-24 20-24 20-24

Tc dng (cm/min) 9-15 9-15 9-15 9-15

B rng ng hn ti a 2,5 ln so vi ng knh ca que hn v tr hn ng trnh ngun vo nhit hn qu mc.

6.4.

Thi cc than Quy Trnh K Thut Hn Trang 13/ 21

Nh Thu Lilama 45.4


Mi ghp chng ca ng s c thi cc than. Quy trnh thi cc than s theo quy trinh nh trong mc 5.4 6.5 6.5.1 6.5.2 6.5.3 Kim st que hn M hiu que hn s c phn bit bng mu cui cc que hn. Vic sy que hn s c thc hin theo tng loi que mt cch trit . Vic thc hin sy que hn phi c hn thin trc khi tin hnh cc bc chnh. Kim tra nht trnh vic gia nhit que hn mt cch cn thn, ghi chp y , theo di trc khi pht que. S lng que hn pht ra ch mc ti thiu m chng c th s dng c trong thi gian cho php que hn iu kin bn ngi. Nhng que hn c pht ra m iu kin bn ngi vt qu thi gian cho php s phi thu hi v sy li. HN VNG TRONG NG HM

6.5.4

6.6

6.6.1 Cc dng c cn thit phi c trang b bo v qu trnh hn khi nc thmdt trn nc hm.

6.6.2 Cc dng c thng gi phi c trang b bo v v tr hn v th hn khi khihn. Khu trang chng bi che mt c s dng khi cn thit. Nhit v m phi c kim st cht ch v nghi chp li hng ngy vo nht k thi cng.

6.6.3Cc bc hn s c thc hin nh sau:Hn pha trong c li rnh Hn bn ngi

6.6.4S phn cng th hn v cc bc hn s c thc hin nh sau, nhm m bo antan trong khi hn.

Trong trng hp c 4 th hn 5 4 3 2 1 Cc bc hn thin. Quy Trnh K Thut Hn 7 6

Trong trng hp c 3 th hn 9 8

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Nh Thu Lilama 45.4


Sau khi hn xong lp th 3 ca mi hn vng vi tn b chiu di mi hn, chiu di mi hn s c chia thnh nhiu on, mi on ny c hn bng phng php tng t mt. Mi mt lp thay th c khong 50mm so vi cc ch khc. Vic chia thanh tng t mt khng c thc hin cho mi ni kiu ch T ca loi mi hn vng. 7. TH HN V TH IU CHNH MY HN Th hn v th iu chnh my hn s c kim tra nh gi cht lng theo tiu chun JIS Z 3810 trc khi cho php hn chnh thc. Bng nh gi cht lng th hn SMAW. Loi Mi hn u ca Lp ti cng trng ng ng p lc Gii hn 40 mm hoc nh hn Vic nh gi A-2F, 2V,2H,2O (4 v tr hoc 2) Khng gii hn A-3F, 3V,3H,3O (4 v tr hoc 3) Ti xng thi cng 40 mm hoc nh hn Khng gii hn Mi hn chng ca Ti xng thi cng ng ng p lc Khng gii hn A-2F A-3F A-2F

Th hn SAW c nh gi nh A-2F hoc A-3F v c k nng trong vic iu khin SAW. 8. 8.1 VT LIU HN V QUY TRNH P DNG CHO MI PHN ON NG Hn h quang (SAW) Ap dng cho vic hn t hp cc mnh ng trong cng mt phn on ng v c p dng cho tt c cc phn on, tt c cc khuu; lp bi c hn bng tay, cc lp hn tip theo c hn t ng c th xem bng sau: Kim loi hn Lp hn Que hn Nhn hiu KOBECO LB-62 MF38/US-49 MF38/US-49 MF38/US-49 ng knh 4mm 4mm 4mm 4mm 01 Kobelco Quy trnh hn s Hng ch to

V tr

Bi Tt c cc mnh ng trong mt phn on SM570 01 . Cui 8.2 Hn kh bo v (SMAW)

Ap dng cho cc phn on ng, tt c cc khuu, chc ba v tn b cc lp hn ny c hn bng tay c th xem bng sau: Quy Trnh K Thut Hn Trang 15/ 21

Nh Thu Lilama 45.4


V tr

Kim loi hn

Lp hn

Que hn Nhn hiu que hn KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 KOBECO LB-62 ng knh 4mm 4mm 02 4mm 4mm 4mm 4mm 03 4mm 4mm 4mm 4mm 04 4mm 4mm Quy trnh hn s

Hng ch to

Bi 01 SM570 . Cui Bi 01 SM570 . Cui Bi Ghp cc phn on ng, cc khy li vi nhau 01 SM570 . Cui 8.3 KIM TRA QUY TRNH HN

Cc vnh dn hng

Kobelco

Cc gn tng cng

Kobelco

Kobelco

Trc khi trin khai cng tc hn, qui trnh hn s c c quan chc nng gim nh, cp chng ch v s p ng k thut cho tng qui trnh hn c th. Thp hn (mc thp, dy), kiu mi hn, que hn, thit b hn v th hn trong qui trnh hn phi ng vi cng tc hn thc t s c trin khai ti xng ch to. Vic kim tra s c tin hnh trn mi chiu dy tm cho tng quy trnh hn. 8.3.1 Vi tr hn Trang 16/ 21

Quy Trnh K Thut Hn

Nh Thu Lilama 45.4


- SAW: v tr bng i vi mi hn dc v hn vng ca chu vi ng ng ti xng thi cng. - SMAW: v tr ng, v kt hp v tr bng v ni cho mi hn vng trong ng hm. 8.3.2 Kch c ca tm mu th nghim Kch c ca tm mu hn kim tra ti thiu s l 400 x 300mm c to thnh 02 tm m c kch thc 400 x 150 c hn bng cc phng php hn SAW v SMAW. 8.3.3 8.3.4 Nhn dng cc tm mu th nghim Tt cc tm mu hn ni kim tra s c ng du ch r c ngi hn v ngy hn. Th bn c hc Vic th bn c hc sau y s c p dng theo tiu chun JIS Z3801 - Hai ln th bn ko ca trc hn - Hai ln th nghim un cong lp lt - Hai ln th nghim un cong lp mt. 8.3.5 9. Cc biu mu nghim thu (cc phn on-ct-chc ba) ng ng p lc trc khi xut xng: (Xem ph lc) SA CHA MI HN Vic sa cha mi hn s c thc hin bng phng php hn h quang kim loi (SMAW) khi cc khuyt tt hn vt qu gii hn cho php theo JIS G3104 i vi kim tra chp phim theo tiu chun AWS D1.1 c p dng cho vic sa cha mi hn. Nhit gia nhit s cao hn 30oC so vi mc hn bnh thng. Chiu di mi hn sa cha ti a s l 80mm. Vic gia nhit s c thc hin trc khi thi cc than ty b khuyt tt nh hn bnh thng.

9.1

Que hn Cp thp SM 490 ,Q345 SM570,Q460 Hng que hn LB-52 hoc tng ng LB-62, hoc tng ng

Que hn s c sy v gi m nh tiu chun mc 3.2

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Nh Thu Lilama 45.4 Gia nhit, gi nhit v nhit Cp thp SM 490,Q345 SM570, Q460 Nhit gia nhit

Cng Trnh Thy in ng Nai 3 & 4 Nhit gia nhit Nhit gia nhit

40OC 100OC

100 - 150OC 100 - 150OC

Ngy sau khi hn nhit 150oC khong 2 gi

Phng php kim st nhit Phng php gia nhit La gas Gia nhit v nhit Phn nhit Nhit hn Phn nhit

9.2

Quy trnh sa mi hn Khc ch V ( su: 1mm hoc hn) Mai R kh v x hn Tay moi han bang uc ranh ho quang Chuan b han bang mai sach Gia nhiet Han lai Mai sach

.2.1

.2.2

Gia nhiet

Sa moi Han (gi nhiet) Vt nt v hn khng y Tay moi han bang o sau uc ranh ho quang (h) Chuan b han bang maiMai phang sach

.2.3

Gia nhiet

Sa moi Han (gi nhiet)b han bang Chuan mai sach lm Gia nhiet

Gia nhiet

Kiem tra viec tay bo khuyet tat

.2.4

H 0.8mm


.2.5

Thiu chiu di chn ng hn

Gia nhiet

Han ap

.2.6

Arc strike Mai tay bo

Vet lom

Gia nhiet (>30oC so vi mc bnh thng)

Han sa Mai Gn ng hn. Nhng ng hn c hnh dng khng ph hp, cc gn ng hn s c hn thin bng phng php mi. Hoa la Cc vt bn la trn b mt pha bn trong ng m chng lm nh hng n sn thi phi dng ba g loi b hoc mi sao cho khng lm nh hng n b mt ca ng ng.

.2.7

.2.8

9.3

QUY TRNH THI CC THAN. S c thc hin bng phng php thi cc than h quang Gia nhit s c thc hin trc khi tin hnh thi cc than theo mc 4.2 Que thi cc than s l loi G c ng knh 13mm Quy Trnh K Thut Hn Trang 19/ 21

.3.1

.3.2

.3.3

Nh Thu Lilama 45.4


9.4

QUY TRNH MI Cc lp gn th ca ng hn, cc khuyt tt b mt m khng cn phi hn sa li chng hn nh chy chn, cao qu v cc mi hn c sa li s c hn thin bng cng vic mi sao cho khng lm h hi n b mt ca ng.

9.5

QUY TRNH HN iu chnh nhit hn Ngun nhit hn s c nm trong khong 10.000J/cm 45.000 J/cm iu kin hn

.5.1

.5.2

Hn

. knh que hn 4 5

Dng in

in th (Volt)

Tc (cm/ph)

Hn bng

110-170 120-200 100-170 100-150

19-25 19-25 19-25 19-23

10-20 10-20 7-19 8-19

Hn ng Hn trn Bo co

4 4

.5.3

Nh thu s phi bo co v c bin bn i vi vic sa cc mi hn. Kim tra khng ph hng Trong trng hp pht hin cc khuyt tt bn trong, phng php kim tra khng ph hng (siu am, thm thu hoc cc yu cu khc) s c p dng kim tra vic ty b v sau khi hn sa cha. Kim tra theo yu cu ca nh thu t vn thit k cho tng thit b c th (phng php kim tra, v tr kim tra, t l % ) 10. 10.1 KIM TRA IU KIN TRIN KHAI CNG TC GIA CNG CH TO Kim tra nghim thu vt t u vo Tt c cc loi vt t dng ch to thit b bt buc phi kim tra nghim thu. iu kin, tiu chun nghim thu: Kim tra i tng nghim thu: Vt liu phi mi, khng han r , r, nhn mc (nu c) phi r, kim tra kch thc hnh hc.

.5.4

i vi cc chng loi vt t do nh thu cung cp: Ch u t hoc nh T vnca Ch u t s kim tra: Chng ch ngun gc xut x. Chng ch cht lng ca nh sn xut hoc test report. Ly mu kim tra c tnh, thnh phn ha hc (Khi c s nghi ng Nh thu dng khng ng chng loi vt t nghim thu).

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Nh Thu Lilama 45.4


Trong qu trnh gia cng ch to khi gim st ca Ch u t nghi ng v chtlng vt t th hn tn c quyn yu cu ct thm cc mu th lm r cht lng ca vt t .

Vt t c bit, nh l: Thc hin vic ly mu kim tra c tnh, thnh phn h hckhi c s nghi ng v cht lng. Nh thu thi cng c bi tp kt vt t ring, tch bit. Trng hp kt qu th nghim khng t yu cu th lp bin bn loi b, khng c s dng chng loi vt t cho gi thu.

Trng hp khng iu kin nghim thu (thiu mt trong cc chng ch trn) mnh thu vn a vo s dng th nh thu phi hn tn chu trch nhim v cht lng sn phm ca mnh. n v TVGS lp bin bn hin trng, ghi vo s nht k thi cng, ng thi t chi nghim thu cht lng v khi lng ca sn phm s dng chng loi vt liu trn.

Ct mu th kim tra theo xc sut mi l vt t, a mu kim tra c tnh tiphng th nghim ca c quan c chc nng (Khi c s nghi nh v cht lng). TVGS s cng vi nh thu ly mu v lp biu kim tra ly mu vt t. (Theo mu biu mu Bin bn kim tra vt t trc khi a vo s dng). Khi y iu kin nghim thu, lp bin bn nghim thu vt t a vo s dng. 10.2 Kim tra my mc, thit b s dng gia cng Nh thu gia cng c trch nhim trang b cc thit b vi cht lng p ng c yu cu k thut v s lng m bo tin , bao gm : + Thit b gia cng: my nn tn, my lc ng, my ct, my hn, my mi, my khoan, my nn kh, phun sn v,v. + Thit b nng h v vn chuyn (cu trc, cu, t,... ) + Thit b kim tra cht lng sn phm: Thit b o chiu dy thp, my siu m, o chiu dy mng sn kh, o nhit , m, o vt mp v kch thc mi hn, my thu bnh, kinh v, qu di, dng v g, thc ... Ch u t hoc t vn ca ch u t s kim tra cc thit b cng ngh, thit b o,ca Nh thu gia cng. Trong trng hp cn thit c th yu cu Nh thu gia cng phi b sung hoc thay th thit b. Nu thy cn s bo co Ban qun l can thip kp thi. Cng tc chun b mt bng cng s c kim tra v lu vi Nh thu gia cng. Kim tra din tch, tnh trng nh xng sn xut, xng bn ct, phun sn, kho vt t, bi tp kt vt liu, sn phm, sn phng dng. 10.3 H s th hn: H s th hn p ng vi qui trnh hn c ph duyt: h s chng ch ca th hn s c cp b sung khi bt u tin hnh cng tc hn thnh phm thit b.

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