Tgp chi Khoa hoc - Cong nghe Thuy sdn S6 4/2014 KET QUA NGHIEN CQU DAO TAO SAU DAI HOC NGHIEN Clfu ANH Hl/OfNG CUA CHE DO HAN TlT D Q N G DlTCfl LOfP THUOC BEN DO BEN MOI HAN GIAP MOI TRONG KET CAU TAU THEP THE ASSESSMENT EFFECTS ON SUBMERGED - ARC WELDING MODES TO THE STRENGTH OF BUTTED PLATE IN STEEL SHIP Ngd HAng', Huynh Vdn VU^ Ngay nhan bai: 18/3/2014; Ngay phan bien thong qua 06/5/2014; Ngay duyet dang 01/12/2014 TOM TAT I Bdi bdo cong bo ket qud nghien cim dnh huang cua viec lua chgn che dg hdn tjf dong dual lap ihudc (chi xet ba thong so Id cudng dong dien I, dien dp hdn U vd vdn loc hdn V) den ben moi hdn kit edu tdm gidp moi n ong tdu thep Thong J qua kit qud kiem tra dg ben dia 2} logt mdu thi nghiem moi hdn gidp moi theo quy dinh cua Quy phgm TCVN 6259-6:2010 vdi cde che hdn khde dugc tinh todn bdng ly thuyet, kit ludn rdng ehe hdn vdi cudng dong dien I = 1000(A), dien dpU = 35(V) vd van toe hdn V - 27(m/h) cho kel qud tot nhdt Til khoa: che hdn hdn tu dgng dudi lap thuoc thong so hdn ABSTRACT This paper performs the result of effects on submerged-arc welding modes (including three parameters amperage welding I voltage welding U and velocity welding V) lo the strength of butted plate in steel ship Through the strength testing of specimens according to the rule TCVN 6259-6 2010 the 21 experiment specimens conducted by submerged-arc welding with some different modes, it concludes that the welding mode (amperage welding I = 1000(A), voltage welding U = 35(V) and velocity welding V = 27(m/h)) is the best Keywords: welding mode, submerged-arc welding, welding parameters DAT V A N B £ Cdng nghd hdn la mdt d c iinh vuc phirc tap, d n phai d su phoi hgp cOa d e ITnh vuc khoa hpc khac nhu: Vat ly, hda hpc, luyen kim, co khi, tu dpng hoa, ky thugt dien vd didn tu Chinh vi t h l chdt lugng moi han phu thupe vdo nhieu y l u t l khaeh quan, chii quan c h i tgo cdc sdn pham bdng phuong phap han Trong cac phuong phdp hdn khde nhau, eae y l u td d n g nghd d n g d nhifng anh hudng rdt khac Cong nghe hdn ho quang dudi Idp thuoc hay d n ggi Id hdn hd quang chim SAW Id phuong phap hdn day didn euc nong chay dudi Idp thuoc bdo vd da dugc sir dyng d d c nudc d n i n d n g nghigp phdt triln [1] Cong nghe hdn hd quang dudi Idp thulc (SAW) duoc ung dung rong rdi d cde nudc phdt trien [2, 6] Tuy nhien d Viet Nam ndi chung va cde nhd may ddng tau noi rieng vd dgc biet Id d e e o s d day nghe, cdng nghe ndy cua tinh Khanh Hoa it duoe chii trgng, budc dau cd tinh tham dd, chua hinh quy trinh on ^ n h va phat triln mgnh Vi vdy phuong phap han ho quang ty dpng dudi Idp thuoc phdt trien mgnh nganh cong nghigp ddng tau nudc phdt tnin Viee lua ehpn ehe dp han trudc day chu yeu dua theo yeu eau cua nhd sdn xuat hodc chi it cung Id kinh nghidm duge du nhgp tCr nhu-ng nudc d nen ddng tau phdt tnin vd cd biet co nhirng tnfdng hgp khdng duge eoi trpng Dieu rd rdng chua phu hgp vdi dieu kidn moi trudng, eon ngudi, thiet bj, tgi Viet Nam va anh hudng khing tot din chat lugng sdn pham Sau thdi gian tham gia tOFC tilp san xult, dao tao eong nhan han qua dgt hdng cua d c co sd dong tdu vide cung d p nguon nhdn luc v l v i n d l ndy vd qua tim hilu nhirng nghien ciru tRfde, ' Ngo Hung: CaohocKythu|ttSu thuy 2011 -Trudng Dai hgc Nha Trang ^ TS Huynh Van VG: Khoa Ky thuat giao thong - Torong Dgi hpc Nha Trang Ti^UONG OAI HOC NHA TI5ANG • 149 So 4/2014 ' Tgp chi Khoa hoc - Cong nghe Thuy sdn nhdn thay viee Iga ehpn ede che dO hdn hgp ly nham dam bao chat lugng cdc moi han chua duge dgt vd quan tdm mpt d e h diing mde Dae bigt nhung trudng hgp hdn e6 yeu d u chit lugng eao nhu hdn cde ket d u tdu thdp Chinh vi vdy vide nghidn cdu anh hudng cQa eac thing so d n g nghe den chat lugng, tgo dang moi hdn va qud trinh hdn Id vige lam d n thilt vd d p bach Dua trdn ede tdi lidu da d nudc vd nudc ngodi, eua cdc hang thilt bj hdn trdn the gidi da thu thgp vd tdp hgp dugc cac thing so toi uu v l ly thuylt, tir bing thuc nghigm nghidn ciru trdn d c mlu tdc gia tiln hdnh Iga ehpn dugc d c thdng s l thge nghidm cho phii hgp vdi dilu ki#n cua Vidt Nam Trong qud trinh hdn khdo sdt mpt y l u t l thi cde ylu to khde dugc giif nguyen Tip d6 cho cac yeu t l diu ra: hlnh dgng moi hdn dp ben moi hdn va bien dgng han Dga trdn cdc k i t qud thi nghipm ddnh gia Hinjz tkng cac thing so hdn thay doi thi hlnh dang ni^ hdn, d | ben m i l hdn vd biln dgng hdn thay d& ^ ndo, d i n d i n co tinh eOa chiing bj tdc dOng Tir dd di d i n kit lu§n v l vi$c Iga chpn cdc thongB6 CO bdn eua d n g nghe hdn ho quang dudi idpthuic SAW mpt d e h tdi uu, d l ddm bao chit lugng mji hdn t i t nhit dp dgng ddo tgo vd sdn xuat t^i Vidt Nam II Dd) TiroNG vA PHU'aNG PHAP NGHIEN c(ru D I t y g n g nghidn ciru D l i tugng nghien ciru Id dnh hudng cOa ba thdng so cudng d l dong di$n han /(A), di^n ap han U(V), t i c dp hdn V{mlh) d i n chit lugng mli h^n gidp moi eua t i m k i t d u tdu thep theo quy dinti cda Quy pham TCVN 6259-6:2010 (hinh 1) |7] J L 8* m^HcartS uin y-S v.m L I Ou«r Uh iai(notcc9rti> !!&Cgfesaai catb6 Hinh Quy each tSm hiln thii nghidm Phuang phap hdn Id h i quang tg ddng dudi Idp thulc SAW, vdi mdy hdn hieu KOBELCO, so hi^u DW-S43G cua Vipt Nam san xuat, day han thdp eacbon AWS-A5 17-EH14 dudng kinh F4.0mm, thuoc bao ve AN-348-A cua Nga san xult Qud trinh han thu nghigm dugc tiln hdnh tgi xudng Co eOa Trudng Trung d p nghe Ninh Hoa, kiem tra d | ben uon, kdo cua kim logi co bdn Hinh Bieu lire Mo - gian d^i thep cff ban 150 • TRUONG OAI HOC NHA TI5ANG '- Ufa u Hlnh Vj trf ck mau kiem tra dO b^n va cde mlu thu moi hdn tai phong thi nghiem co tinh cOa Vign Che tgo tdu thuy - Tnj-dng Oai hpc Nha Trang T i m phoi thep nguydn lidu AH-36 dugc xSc dinh dp b i n kdo nhu hinh (irng suit keo Idn nhSt a^= 545 kN/mm^ ung suit chdy a.= 366 kN/mm', dp gian ddi Dl = 26.7%) vd dp ben uln nhu hinh (igc uln Idn nhit F^=56.59 kN), Hinh Biiu lire uon - gian dii th^p cff ban So 4/2014 Tgp chi Khoa hoc - Cong nghe Thuy sdn PhiFomg phdp nghien cihj vd khd nang tdi chinh eho phdp thi vide kiem tra t i t Chgn c h i dd hdn irng vdi thep AH-36 cd chilu cd cdc m l u Id tdt nhat nhien d day chT chgn day 16mm, dgt ten Id logt mau X, d d c thdng so nhiing phdi hdn tot nhat theo kiem tra so b | chit cy t h l I d / = 1000(A), U = 35{V), \ / = 27(m/h) [1, 3] lugng bdn ngodi d l gidm bdt thdi gian, kinh t l , Sau d6 thay d l i gid tri cua ba thdng so bang cdeh cdng sdc thgc nghidm va eCing thda man dilu kidn tdng len hogc gidm di 20% so vdi gid tn tieu ehuin quy hogeh thgc nghigm d tren, dugc ddt ten tCr logt m l u X^ d i n X, L i n lugt Phli sau Iga chpn dugc cdt thdnh d e mlu eac gid tii cua cdc thdng so tuong u'ng vdi nhdm thd tidu chuin theo cae vj tri quy djnh nhu hinh miu hdn thyc nghi§m duge trinh bdy d bang d l xdc djnh cde thdng so dd b i n nhu ung suit kdo Vdi moi logt m l u X, tiln hdnh han phdi (M, M Idn nhit, dng suit chdy, Igc uon Idn nhit, bien dgng M|^j) vdo cdc thdi diem khae nhau, sau dd Iga chgn ddi, Chang hgn hinh dnh phdi Iga chpn d l thir phdl d hinh dang tot nhat dem phdn tich ddnh nghidm cCia logt mlu X, (dl don gidn gpi Id mau X,) gid T i t nhidn n l u dilu kien thdi gian thi nghigm nhu hinh Bang C h i han cQa 21 m i u thir nghigm TT 10 11 12 13 14 15 16 17 18 19 20 21 1(A) U(V1 V(m/h) 1000 35 27 1200 35 27 800 35 27 1000 42 27 1000 28 27 T§n mSu M, M, M, M, M M M, M M, M,„ M„ M„ M„ M, M„ Loat mau X, Xa 'H A, " M„ 1000 35 32.4 1000 35 21.6 M„ M« M„ M,„ M„ '^ '\ Hinh Ph&i lira chgn de thir nghidm cua io^t mlu X, TRUONG OAI HOC NHA TRANG - So4/20U Tgp chi Khoa hoc - Cong nghe Thuy sdn Kit qud thu nghigm dp bin cua mau X, so vdi gid tri cua t i m thep eo bdn nhu bdng Ro rdng d c gia trj ve d | ben eua mli hdn d mlu X, d i u tot hon vdt lidu eo bdn, dieu dd ehirng td rang c h i dd hdn d a m&iX, dgt yeu d u Bang So sanh gid trj dg b i n cQa m l u X^ vdi kim lo^i c a bdn ——~ ^^ D9i lir^g irng suat k6o (MPa) L(rc uin (kN) irng s u i t chdy (MPa) 0$ gian dai (S) Mau kim loai ca bin (KLCB) 545 56 59 366 26.7 Mlu th&X, (MT) 540 56.50 360 28.4 III K^T QUA NGHIEN Cl>U VA T H A O L U A N Sau thuc hign xae t^nh d e thong so dd b i n td d c mau thu d t tip d e phdi Iga ehpn cua loat mau X, din Xj neu tren kit qua thgc nghidm duge tong hgp d bang nhu sau: Bang Tong hgp ^^*^ ^"^ ^9 ^^'^ cda d c mau thi nghi#m X, ^ >!, x^ X, -< »• r(mm) Chieu rgng mdi hdn 30 35 25 40 25 23 35 h (mm) Chieu cao moi hdn 3 i 1.5 5 4.5 a^, (kN/mm^) Ong suit kdo Idn nhat 640 532 435 532 435 532 465 0.^ (kN/mm^) LKng suat chay 360 355 303 355 303 355 303 56.50 45.75 28.63 52.92 45.75 45.75 52.92 Al (%) Dp gidn ddi 28.4 26.7 27.5 26.7 27.5 26.7 27.5 1(A) Cudng dp d6ng dien 1000 1200 800 1000 1000 1000 1000 U(V) Dien ^p h^n 35 35 35 42 28 35 35 V (m/h) Van toe hSn 27 27 27 27 27 32.4 21.6 Lo^t m l u Lge uon Tif ket qua d bdng 3, so vdi gia trj ben eOa irng vdi ede mlu X^ d i n X, deu khdng dat yeu ck vat lipu CO ban {a^= 545 kN/mm^ a.^= 366kN/mm=, Ngoai tir bang 3, d t h l bieu diln moitirong Al = 26.7%, F^= 56.59 kN), c6 t h l nhgn thay rang d | quan giua cdc thing so U, I, V vdi d c thong sohinti ben tgi vj trf moi hdn ciia d c mau tir X^ den X, d i u hpc r h, Al cua mdu Iga chpn nhu thj hinh6vi nho hon Dieu d l ehirng to rdng che d | hdn tuong ede thong so dp ben o^, o., F^ nhu de thj hinh 152 TRL/ONG OAI HOC NHA TRANG So 4/2014 Tgp chi Khoa hoc - Cong nghe Thuy sdn tri 45 X 40 - • 35 i X 30 i * X 25 • X ^ • r(mm) • A • • h (mm) iAl«) X 20 XU(V) XV (m/h) 15 10 11 L • • • Hinfa M^i tinmg quan ^ira U, V vi M5uXi IC thong so hinh h9C r, h, Al tang theo, chieu cao moi hdn h giam di (miu X^) va Qua thj d hinh 7, nhgn tfiay rang: - Miu X, cd dp gidn ddi Idn nhat, ehirng td dp deo dai d a mdu thir tdt nhat - Khi tang dien dp hdn U thi chieu rpng moi hdn r ngugc Igi (mlu X^) - Khi tdng vdn tdc hdn V thi chilu rpng m i l han r giam (mau X J vd ngugc lai (mau X^) * au[kN/mm2] • en Idn nhit IV K^T LUAN VA KI^N NGHj I.Ketiugn - Khi tang dien ap ban U hogc tdc dg hdn Vthi Nhu vdy, qua tinh todn ly thuyet de xac djnh d c dp bin mdi han tang Idn (miu X^, X^) vd ngugc iai thdng so cCia c h i dd hdn tieu ehuan, sau dd dCing (miu X Xj.), nhien vIn khdng dgt dO b i n nhu thgc nghidm d l hdn d c logt phdi m i u bdng d e h miu X, thay ddi d c thdng s l dd cd phgm vi 20%, TRLfONG OAI HOC NHA TRANG • 153 Tgp chi Khoa hoc - Cong nghe Thuy sdn d the nhgn thay rang c h i dp hdn hgp ly nhit la miu X , hay vdi logi thep ddng tdu AH-36 ed kich thudc be day t = 16 (mm) thi ehpn d e thong so eua ehi dp hdn Id + Cudng dp ddng dien I = 1000(A); + Didn dp han U = 35(V); + Vantochdn V = 27(m/h) Ro rdng so vdi so lidu ve che dp hdn dugc cung d p bdi nhd san xuat ciJng nhu quy djnh cua Dang kilm Id d mgt mien hay mgt khcang gid tri ndo do, tde gia da xdc djnh dugc thdng sd CM t h l cua c h i d$ hdn toi uu irng vdi cae dilu kien cy t h l tgi trudng Trung Cip Nghe Ninh H6a vd dieu kidn sdn xuat tgi Nhd may Tdu bien Hyundai - Vinashin Kiln nghj Sau nghien cuu ly thuylt, thuc nghiem, khdo sat thgc te tgi Nha mdy tdu bien Hyundai - Vinashin va qud trinh ddo tgo d n g nhdn han cua Trudng Trung d p Nghe Ninh Hoa viee irng dyng quy trinh hdn tu ddng dudi Idp thuoc, d mot so cdc luu y nhu sau - Khi sir dyng may han d n phai thir va ddi ehieu vdi cdc thdng sd cua nhd sdn xult quy djnh - Nguon dien han phai diing bg chinh luu dign ap mpt chieu DC khdng d l i S64/2m - v l c h i dd hdn, phdl chgn dijng cdc fiiongsi toi uu Id mdt dd ddng didn tren mpt dan v| dien ^' day didn ege vdi thdp cdc bon 900(A/mm2) -Didn dp ho quang hdn khing dli vd namtrono ddi cho phdp tir (34 -36)V - V^n l i e hdn t l i yxu 27m/h - T i m vdi dign cgc chpn 105 mm - DCing thuoc hdn ndng chdy vd phdi dugcsSy d 930''C >* V l phuong phdp chuin bj mli hdn, cln phJi tudn thu theo nhung quy tdc sau: - Khe hd giua chi tilt phai dim bao nho nhat vd d i u sudt chieu ddi dudng hdn - Cat vdt canh mdp hdn phai bang mo cat ho$c tren mdy d t eo - Hai ben ehilu ring mdi hdn 25 - 25mm pha dugc Idm khd vd lam sgch son, diu md va cdctgi chit khde - Hdn dinh phai diing que hdn tot hoac iiin lytIG/ MAG chat lugng cao, chilu ddi han dinti 65mm, khoang edeh d c dogn hdn dinh khong xa qud 500mm, d d i u vd cudi dudng han dinh phi han cde tam phy: tam phu d diu dudng hdn d^i 150mm, t i m phu d cuoi dudng han dai 90mni, chieu rgng tam phy 100mm - Doi vdi cac moi ghdp han diu mi co chilu day Idn hon 15mm d n phdi diing ky thudt lot TAI LI$U THAM KHAO Nguyen Van Thong, 2000 Vat li^u va cong nghe h^n NXB Khoa hpc ky thuylt, Ha Ngi Structural welding code-steel AWS D1.!/D1.1M:2004 American welding Socciety 550N.W, LeJeune Road, Mimami, Florida 33126Gas Metal Arc Welding Guidelmes EditorJefENadzam senior Application Engineer Request E205Sefety 2345MurphyBH Gainesville, Georgia 30504U.S.A Phone: l-SOO-241-0804 Fax(770)535-0544 Web Site: www Hamscal.com Booklet w « Lincolnelectricconi/pdfs/products/literature/e205.pdf ' Leonard P.connor, 2009 Weldmg Handbook Vol.1.2,3 Amcncal Welding Society Miami Dupont J.N and Marder, 2005 The Efficiency of ARC Welding Procecces, Welding journal December ESAB 201L Repair and Mainlenace Welding Handbook GOTEBORGS SWEDEN Tieu chuSn Viet Nam TCVN 6259-6:2010, Quy pham phan c5p va dong Xkn biSn vo thdp, Phln 6, HAN Ha Noi 154 • T R U O N G D A I H O C NHA TRANG ... tdc gia tiln hdnh Iga ehpn dugc d c thdng s l thge nghidm cho phii hgp vdi dilu ki#n cua Vidt Nam Trong qud trinh hdn khdo sdt mpt y l u t l thi cde ylu to khde dugc giif nguyen Tip d6 cho cac yeu