Nghiên cứu hàm lượng hidro trong mối hàn để chế tạo thuốc hàn thiêu kết hệ bazo thấp

NGHIEN CU'U-TRAO l V NGHIEN CU'U HAM LU'CXNG HIDRO TRONG M I HAN Dg CHE TAO THU6C H A N THIEU KET HE BAZO T H A P RESEARCH THE HYDROGEN CONTENT IN THE WELD METAL FOR PRODUCE THE AGGLOMERATED NEUTRAL FLUX FOR SUBMERGED ARC WELDING TS Vii Huy Lan TrUdng Dai hge Bieh Khoa Ha Ndi T6M TAT Nghien cdu chi tao thudc hdn thiiu ket he bazd thdp (B=1.1) bdng nguyen vat lieu nUdc de hdn tU dong dUdi ldp thuoc cdc kit cdu thep cacbon thdp vd thep hdp kim thdp Id vdn di khd cdp thiet trong linh vUc sdn xudt vdt lieu hdn Bdi bdo ndy trinh bdy kit qud nghiin cdu dnh hUdng cua cdc yeu to chu yiu (CaF^ Ts, ts) den lUdnghidro mo'i hdn vd phUdng phdp xde dinh gid tri toi Uu ciia chung Kit qud nghien cdu dd dUcfc sd dung de thiet ke thdnh phdn me lieu vd xdy dtXng quy trinh cong nghe che tao thudc hdn thieu ket he bazd thdp tUdng dUdng loai F7A (P)2 theo tieu chudn AWS A5.17-80 Tir Ichda: Toi Uu hda; Thuoc hdn thiiu kit he bazd thdp; Thudc hdn F7A(P)2-BK; Hdm lUdng hidrd; Hdn tU dong dUdi ldp thuoc ABSTRACT In this paper, the research on manufacturing the agglomerated neutral flux (B=l,l) using domestic raw materials for submerged arc welding (SAW) for the production of low-carbon steel and low-alloy steel is currently an urgent inssue manufacturing welding materials This paper reports the results of research the influence of the factors (CaF^ Ts, ts) on the hydrogen content and were determined optimized values of the factors for the mixtures and produce manufacturing technology the agglomerated neutra flux F7A(P)2 according to AWS A5.17-80 Keywords: Optimization; Agglomerated neutra flux; Flux F7A(P)2-BK; Hydrogen content; Submerged arc welding (SAW) "^ ISSN 0866 - 7056 TAP CHI CO KHf VIET NAM, S6 nam 2016 www.cokhivietnam.vn NGHIEN CLfU-TRAODPI l.DATVANDE Hiln nay, d nflde ta, nhieu nginh edng nghiep chi tao kit cau thep Ung dung rdng rai cdng nghe hin tfl ddng dfldi ldp thude, nen nhu cau ve thudc ban Idn Tuy nhien, thudc h i n edn phai nhap khau vdi gii cao Nhim dap flng nhu eau thi trfldng va phat trien sin xuat thuoe ban thieu kit he bazd thap d l h i n eae kit cau thep ylu cau chat Ifldng cao, bai bio se gidi thilu kit qua nghiln cflu ve inh hfldng cua eac ylu td chu ylu (CaF,, Ts, ts) den Ifldng hidrd mdi hin v i phfldng phip xac dinh gia tri tdi flu cua chflng san xuat thudc hin he bazd thap Ngi dung nghiln eflu cac ylu td ehu ylii anh hfldng den Iflgng hidrd mdi han va VAHN che tao thudc h i n thilu ket he bazd thap, gdm cd: -t- Chgn hdp chat dfla vao phan thudc h i n va ty Ie eua nd nham ehu ddng giam lugng hidrd mdi ban + Chgn cae thdng sd c h i say thieu kit chi tao thude han bazd thap • Cng dung quy hoach thUe nghiem nghiln eflu i n h hfldng cfla cac ylu td trin den ham Ifldng hidrd mdi hin Trong sd eae tilu ehi vl chit Iflgng mdi ban ed mgt ehi tilu quan trgng li Iflgng hidrd + Tdi flu hda cie ylu td trin dam bao mdi ban v i vflng inh hfldng nhilt (VAHN) Iflgng hidrd mdi ban ylu eiu Hau hit cic phfldng phip bin ndng chiy, hidro deu cd mat vflng hin Hidrd mdi bin ed anh hfldng tieu c\ic din tinh ban, DOI Tl/ONG, VAT LIEU VA PHl/ONG deo vi dai va dap cua mdi ban chi tao tfl thep PHAP NGHIEN CUtJ v i da sd cac kim loai va hdp kim miu nhfl Ti, 2.1 Ddi tUdng nghien cflu Al, VI cd ehi inh hfldng hidrd d i trinh biy d tii hlu [2], d diy can bo sung la thuoc ban thilu kit he bazd thap ngoai ylu td dl hut am va chfla hdi am dang hidrat tUdng tU nhU thudc ban he bazd trung binh va cao, thdng thudng loai thudc ban cd ty 11 cic phflc chat Aluminate - Rutile eao va phin tfl nfldc cd the tdn tai d mang tinh t h i ben vflng efla cac phflc chat tren Do viy, ehi say thieu kit loai thuoe ban thilu kit he bazd thap, se khac nhilu so vdi quy trinh cdng nghe thieu kit he bazd trung binh va cao - Ddi tugng l i thudc h i n thilu kit he bazd thap (B=l,l), tfldng dfldng vdi loai thuoc h i n F7A(P) theo tilu ehuan cua Hdi Han My AWS A5.17-80 dflde ki hilu qui fldc la F7A(P)2-BK Muc tieu va noi dung nghien cflu: - Vat lieu de che tao mau ban la thep li^ ciu ban SM400B theo JIS G3106, kich thfldc m i u theo tilu ehuan [5,6] Muc tilu eua nghiln cflu li tun cic giii phap kit hgp gifla sfl dung vit lieu va cdng nghe chi tao d l dip flng Iflgng hidrd yen cau de che tao thudc hin thilu kit be bazd thap - Yeu cau Iflgng hidrd trdng mdi ban mflc thap theo tilu chuan eua Viln H i n Qudcte [1,5] la H8 (H ' • > ' «' i> , , '" "', I c n 14 • CaF;,H LUdng hidrd 100(g) kim loai mdi h i n dUdc tinh theo edng thfle: Vx85^5 "T; T: T" i , ' ^ H = —zrhrz ^^^ 0,79 Hmh LUdng hidrd moi hdn phu thupc vdo C«F^ (%) vdi T=600°C t=60ph Qua thi cho thay h i m lugng CaF^ 'ã^^Đ ^^^ lugng hidrd mdi ban se giam rat rd Vdi T =600''C, t=60ph giai doan dau h i m ^ ISSN 0866 - 7056 TAP CHI CO KHI VIET NAM, S6 nam 2016 www.cokhivietnam.vn NGHIEN CLTU -TRAOOOl Iflgng CaF, dfla vio tfl 11 - % thi mflc giam manh Dilu nay, cd t h i dflde giai thich tic dung quan trgng cua huynh thaeh - Anh hfldng cua nhilt siy thilu kit thuoc ban din Iflgng hidrd mdi han: Thdi gian siy anh hfldng ylu hdn hai ye'u td trin - Sfl phu thudc cua Ifldng hidrd moi ban vao cac ylu to dang 3D: -I- Anh hfldng dong thdi eua nhi?t dO say thilu kit va thdi gian say thieu ket den hi(fD^ hidro mdi b i n v i VAHN vdi ham lugng CaF, khdng doi ed dang sau day Hinh LUdng hidrd moi hdn phu thupc vdo nhiet dp thieu kit vdi CaF^ ^10% t=60ph Dac tinh cua dd thi chd thay nhiet say thilu kit tang thi Ifldng hidrd mdi hin se giam manh, Iflgng hidrd mdi ban se tilm cin nhilt say tang din khoang 670-^710°C, eho thay nhiet thieu kit tdi thilu tfl 680°C Diy li ed sd quan trgng d l xic lap chi say thilu kit phan Ifla chgn che say thilu kit hgp ly sau - Anh hfldng cua thdi gian say thilu kit thudc hin din Ifldng hidrd mdi hin: Hinh LUdnghidro moi hdnphif thupc vdo nhiit dp vd thdi gian say vdi CaFy=10% + Anh hfldng ddng thdi cfla ham Iflcing CaF^ v i nhiet say thieu kit din Iflgng hidrfl mdi b i n va VAHN, vdi thdi gian say thi^ kit ed dinh, ed dang dfldi day: Hinh Luang hidrd moi hdn phu thupc vdo thdi gian say vdi CaF^ =10%, T^600°C I LUdng hidrd moi hdn phu thupc vao CaF^ (%) vd nhiet dp say vdi t = 60ph ISSN 0866 - 7056 TAP CHi CO KHi VIET NAM Sd nam 2016 www.cokhivietnam,vn NGHIEN CU'U-TRAO D | - Su phu thuge cua lUgng hidrd moi han vao cie yeu td dang giin dang mflc: - Dilu kiln ring huge va ham muc tilu dflde ebon de tdi Uu xuat phit tfl yeu cau cu the ddi vdi loai thudc ban F7A(P)2-BK can dap flng eic dieu kien lugng hidrd thap sau day: Y = Hjiih thaeh, nhiet s^y thieu ket va thol gian s^y thieu k H CaF2 % Ts, °C ts, phut H j , cmVlOOg 6,34 794 41 5,03 6,5 790 41 5,26 - Sd lieu ddng la thed ket qua tdi flu 500 600 700 Ts, oC 800 - Sd h l u dong thfl la kit q u i kiem tra Sfl sai lech so vdi gia tri tinh toan dUdi 10% v i Hinh 10 Gidn dang mUc xac dinh lUdng H^ nam pham vi cho phep vdi loai thudc ban moi hdn vdt t = 80ph F7A(P)2 Dang gian thuan tien viec xac dinh c b l thilu kit thfle t l sin xuit thude bin 4.3 Xac dinh ham lUdng toi Uu 4.4.1 Cdc dieu kien rdng bugc vd hdm toi Uu Dilu kien tfldng minh la gidi h^n cfla eac bien dau vao: % < XJ = CaFj < 14 %; 500 °C < X, < 800 "C; 40ph < X3 < BOph 4.4 Thao luan Tfl cac kit qui thu dflgc dang cae phfldng trinh bdi qui va dang cac dfldng die tinh ed t b I rut nhflng kit luan quan trgng sau diy: - Cac phfldng trinh hdi quy ed tfldng thich eao R^=0,966, dae tinh anh hfldng cua cie ylu td dau vao din Ifldng hidrd mdi ban cua thudc hin he bazd thap rat rd - D l giam Iflgng hidrd moi h i n thi h i m Ifldng huynh thaeh va gia tri nhiet say, thdi gian say phai dat den gii tri ngfldng nhat dinh ^ ISSN 0866 - 7056 TAP CHi CO KHi V I £ T NAM, Sd nam www.cokhivietnam.vn 2016 NGHIEN CLfU - TRAO OQl KET LUAN - Cong trinh da nghien ciJu anh hilcmg cua cac yeu to c h i yeu iSn luong hidro moi hin - Xay dung cac quan he dinh lUdng va dUa dUac cac phuong phap xac dinh duoc tyl{ huynh thaeh can dUa vao me Ueu thuoc ban va che say thieu ket gom, nhiet va thdi gian thieu Icet de san xuat thuoc ban thieu ket he bazo thap F7A(P)2-BK - Tii cac dutog dac tinh cho thay ngudng anh hudng ro net den lilong hidro moi han la nhiet tren 680°C, hieu qua tang ham lilong huynh thaeh va thdi gian say mdi thilc sil pbat huy tac dung - Xay dung duoc cac gian dang mile de xac dinh luong H^ moi han, giiip cac chuyjn gia ky thuat ling dung thuan tien vao viec dieu chinh tbanh phan huynh thaeh va che thieu ke'l luong hidro yeu cau thay doi - Trong cong trmh da xac dinh duoc ham luong huynh thaeh va che say thieu ket hop ly de san xuat thuoc han thieu ket be bazO thap F7A{P)2-BK.'> Ngay n b | n bai: 23/02/2016 Ngay phan bien: 11/3/2016 Tai li£u tham khao: [1] VO Huy Lan, BuiTOnHanh (2010); Giao trinh Vdt lieu han, NXB Bach Khoa Ha NOi [2] Vu Huy Lan, Tran Xuan Trung (2015); Ng/ife«ci?u/i(]m lUdnghidro mot hdn che tao thuochitl thieu ket hi bazd cao Tap chi Co Viet Nam, so 8/2015, tr 89-96 [3] Nguyen Minh Tuyen (2005); Quy hoach thUc nghiem, NXB Khoa hpc va Ky thuat Ha Noi [4] HoTanoBa H.H., (1989), CeapoHUbte Mamepuajiu dnit dyzoeou ceapKU MaiuHHocxpoeHHe, MocKsa [5] ISO 3690:2000, Welding and allied processes ~ Determination ofhyidrogen content inferritic steel arc w metal [6] VIWELCO (2008); Quy trinfe kiem tra hidro moi hdn ISSN 0866-7056 TAP CHf CO KHl V I £ T NAM, S6 nam www.cokhivietnam.vn 2016 ... va che thieu ke''l luong hidro yeu cau thay doi - Trong cong trmh da xac dinh duoc ham luong huynh thaeh va che say thieu ket hop ly de san xuat thuoc han thieu ket be bazO thap F7A{P)2-BK.''>... gian thieu Icet de san xuat thuoc ban thieu ket he bazo thap F7A(P)2-BK - Tii cac dutog dac tinh cho thay ngudng anh hudng ro net den lilong hidro moi han la nhiet tren 680°C, hieu qua tang ham... I £ T NAM, Sd nam wwM.colcbivietnam.vn 2016 NGHIEN CLfU-TRAODOI - Thilt bi nghien eflu chu yeu: Trong dd: • May ban ti^ ddng dfldi ldp thudc Dosun DZIOOO • Thilt bi dieu nhilt va dung cy ciia