CA2224586A1 - Fitting for use in welding stainless steel pipes with zirconium alloy pipes - Google Patents
Fitting for use in welding stainless steel pipes with zirconium alloy pipes Download PDFInfo
- Publication number
- CA2224586A1 CA2224586A1 CA002224586A CA2224586A CA2224586A1 CA 2224586 A1 CA2224586 A1 CA 2224586A1 CA 002224586 A CA002224586 A CA 002224586A CA 2224586 A CA2224586 A CA 2224586A CA 2224586 A1 CA2224586 A1 CA 2224586A1
- Authority
- CA
- Canada
- Prior art keywords
- lapping
- sleeves
- joint
- thickness
- stainless steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/16—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
- F16L13/0209—Male-female welded joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The proposed fitting for use in welding stainless steel pipes with zirconium alloy pipes is designed as an overlap diffusion welded joint between sleeves (1, 2) made from metals corresponding to the metals of the pipes to be welded.
The surrounding sleeve (2) of the fitting is made from stainless steel and the adjoining surfaces of the sleeves are provided along the entire length of the overlap with alternating projections and depressions (5, 6) which engage with one another. The overlap diffusion welded joint has a hard diffusion layer (7) of not more than 5 µm in thickness. The walls of the sleeves in the overlap region vary in thickness, so that the wall thickness of one sleeve decreases as that of the other increases, for example in steps, and the projections and recesses are annular. The fitting is used in nuclear technology and in chemical engineering as a bimetallic insert for use in welding stainless steel pipes with zirconium alloy pipes.
The surrounding sleeve (2) of the fitting is made from stainless steel and the adjoining surfaces of the sleeves are provided along the entire length of the overlap with alternating projections and depressions (5, 6) which engage with one another. The overlap diffusion welded joint has a hard diffusion layer (7) of not more than 5 µm in thickness. The walls of the sleeves in the overlap region vary in thickness, so that the wall thickness of one sleeve decreases as that of the other increases, for example in steps, and the projections and recesses are annular. The fitting is used in nuclear technology and in chemical engineering as a bimetallic insert for use in welding stainless steel pipes with zirconium alloy pipes.
Description
~ , .
7'R~NSlTlON JOINT TO WELD S1'AINLESS STEEL TUBE AND ZIRCONIIlM
ALLOY T-JBE TOG~THER
Fll~LD or; THE INVENTION
Ihc invel1lion relates to weldin~, and n1ore specifically to transition joints used as bimetal s inscr~ion piece h1 the course of weldin~ stainless steel tube and zirconium alloy tube to~clher, and may be applied in nuclear engineering and chemical machine-building.
PRIOR ART
A ~ransition joil1l used to weld stainless steel and zirconium tubes togelher is known (see ccr(ificate of autl1orship RU 1166948, published ] 5 July 1985). Said transition joint is madc in lo tl1e iOrl1- of lapped diffusion weld joint between stainless sleeve and zirconium sleeve using ~itaniul11 alloy h1lerlayer. Enclosin~ sleeve being made of st~inless sleel~ and steps being prc)vidcd Ol1 surfaces of the sleeves to be welded. Said sleeves are mounted so as the sleps of sald slainless slce~re al~ uisp~ace~ a~vu~h~ 3t;,F~ o~ ~F~._i~ alloy ~
l,imilcd scrvice lifetime under hot water and steam envi~onn.e.lt at up to 350 ~C temperaturc is he disadvanta~,c of above transition jOhlt resulted from reduced axial strength of said lapped dimlsiol1 weld joint. This is explained by the fact, that the ~lleJ,~,lh of said lapped diffillsion hondil1~ joint is pl ovided by close observance of all specified welding conditions. Thc strength of saicl di~usion weld joint may be reduced due to any negligible departure from said specified weldin~ conditiol1s, that is especially typical for quantity production. Besides, expensivel1ess of 20 said tlallsllion joirll ~lut~ lu l~ mourlt of tit~nium u~d, :~nd high l~c.r t~nn~llm~ l in mal1u~'acturing al e among another disadvantages of said transition joint.
/~ lransilion join~ to weld stainless steel tube and zirconium alloy tube together (see ccrl.ificatc of au~ -ship USSR 202404, published 29 June 1967) is the closest one to lhe invention as lo lhe tolali~y of essential features. Said transition joint is made in the form of lapped diffusion 2s wekl jOint of slecves of stainless stecl and zirconium alloy, enclosing sleeve being made of sl~inlcss sleel, and alternating en~aging rid~es and valleys are provided on the entire len~lh of lapl)il1~ portion Or the mating surfaces for the lapped joint between the sleeves. Said lapped difl'usiol1 weld joint has liquid diffusion interlayer of thickness ranging from 10 to 1.~0 ~m (liquid zirconiul11/il-on eutectic). Mechanical engagement of the sleeves is used to ensulc 30 su~rlcicl1l stren~tl1 of said transition joint, and leaktightness of said transition joint along enlirc are~ of said mechanical engagemenl is ensured by said diffiusion interlayer in the form of said liquid ~irconiun1/iron eutectic.
l,hni~cd service lifetime under hot water environment at more than 150 "C temperalule and failure ~o opera~e in hot water and steal11 at temperature ranging from 20û to 350 "(' due to low lony,-telm corrosion stren~sth is the disadvantage of said transition. Long-terrn corrosion slrcn~,ll1 is the s~length under lon~ exposure to corrosive environment, operating and thermal s~rcsses ~aid lappcd diffi~sion weld joint of sleeves of stainless steel and zirconium alloy usin~
liquid difl'usion interlayer of eutectic composition of 10 to 150 llm thickness is characlcri~cd \~ith low slren~lh and low corrosion resistance. Stress corrosion is the reason why said 40 C~ 'USiOIl weld jOil1t comes fractured after long operation. This is explained by stress pcaks pro(luced in lapping porlion ed~es of tubular lapped diffi~sion weld joints between dissimilar matclials witl1 clifferent coefficienls of thermal expansion. Said peak values are direclly plopollional t(- the stiffness of walls of the sleeves to be interconnected, and differcnce CA 02224~i86 1997 - 12 - 12 between the coefrlcients of thermal expansion. The larger sleeve wall thicl~ness, the hi~her slim1ess of said sleeves, hence, the higher the level of stresses in lapping portion ed~es. As sleeve wall thickness in said lappin~ portion decrea~es to values below wall thickness of lap-fiee slceve ends, axial strength of said weld joint reduces. An attempt to retain the required 5 axial slrctlgth of ~he weld joint causes increase in total thic~ esc of sleeve walls in lapping IlOlliOIl and transition joint cross dimensions, that is unacceptable for restricted design conditions, for example, such as nuclear reactor core. As hot water temperature increases ahove 200 "C, peak stresses (stress concentrators) in lapping poniOn edges rise in dircct pr()por~ic)n. As soon as said peak stresses increase above said diffusion interlayer strengtl1, lo weld joint tears in said lapping portion ed~es. Stress concentration rises in the place of tear, and slless colTosion rate increases, that results in rapid fracture of said thick liquid inter3ayer of eulectic composition.
DISCLOSURE OF THE INVENTION
Il is an ob3Prt n~'~h~ nresent invention to l~rovide a tubular transition joint of stainless steel and zilconium alloy joined together using lapped diffusion welding, with small thickness o~~iappin~s porlion wali and long-term service lifetime in hot water and steam at up to 35() ~C
tcmpcl atures.
Technical effcc.t of the invention produced in the course of the present invelltion h11plcmcl1tation lics in hi~her long-lerm corrosion strength of the transition joint exposed to hot 20 walcl ~nd steam at up to 350 ~C temperatures due to higher corrosion resistance and strenglh ol' s~id dif~usion weld joint. Said diffusion weld joint made using solid dif~tsion interlayer of thickness within ~ ~m, has high corrosion resistance in hol water and steam at up to 350 "C
teml-clature (obtained by experiments). ~sesides, high strength of said tubular lapped weld joint is plovl~ca US~ u;>ivr ~TItcrhjo~of' ~p ~o ~ r~ thi~knP.~;,c. in c~n-hin~tion with 25 mecl-anical en~a~sement, provided in the form of alternating ridges and valleys. As known fi om S~fllC of art, rather bigh strength of butt diffusion weld joint between titanium (the metal, which is in lhe same ~roup with zirconium) and stainless steel is provided by said solid diffi~sion inlerla~cl- of 3 ~ m thickness. Hnwevel, high residual thermal stresses across said diffusion inlellayel~ prodlJced due to two-fold di~erence between coefficients of thermal expansiol1 for ~o tital1iul11 and slail1less steel (~<Diffusiol1 welding of materials~ by Kazakov N. V., M, ~<Mashit1ostroel1ie~~ 1976, pp. 186 - 190), are the cause of spontaneous fracture of said lapped difl'usion weld joint between the above metals and said solid diffilsion interlayer in the course of coolin~,. Known are butt diffusion weld joints of zirconium and stainless steel with rather high sllcngth achieved due to thin interlayers, such as niob~um, copper, nickel, inserted belween ~he layers to be welded. however these joints are not applicable as tubular lapped joil1ls due to three-fold difference between the coefficients of thermal expansion for zirconium al1tl stainless stcels (K. Bhanumurthy, J. Krishnan, G.B. Kale, S. Banerjee, Journal of Nuclear Materials, v. 211 ( 1994), pp. 67 - 74. ~Transition joints between Zircaloy-2 and Stainless Sleel l~y ni~ sion I3Ondin~~). Said rcsidual thermal stresses portion is taken by mechanical 40 eny,a~,cmcn~ Or said transition joint, therc/ore, sald stresses are r~ v~ bid 3vli~-~.i,~ucion intcrlayel, despi~e the fact that there is three-fold difference between the coefficients of thermal expansiot1 for zilconium and stainless s~eel.
(~ombinalion ol' l1igh corrosion resistance and high strength for said solid diffi~sion intcrlaycr wilh nol more lhan 5 ~Im thickness provides long-term corrosion resistance to said tran~ition 4s joinl exposed to hot water and steam of up to 3~0 ~C temperature.
, .
The ~bove technical effect is reached by the fact that said transition joint used to weld tubes of slainless steel and zirconium alloy together which is made in the form of lappe~ diffi~sion weld jOillt of sleeves of the metals corresponding to the metals of the tubes to be welded, 1he enclnsin~ sleeve being made of stainless steel, and entire length of the lapping porfion of s n-atin~ sulfaces of said sleeves has allerl-ating ~.n~agin~ ridges and valleys.
I,apped diffusion weld joint has solid diffusion interlaycr of thickness not more ~han S llm.
13csidcs, to exclude ~ears of the weld joinl in lapping portion edges, variable thickness wall Or said slecves in Ihc area of lapping portion is implemented, so as while wall thickness of one slceve increases~ another one decreases in appropriate manner. This allows one, in combination ~o, with l)i~ll corrosioll resistance of said diffusion interlayer, to slow corrosion rate, whicll is inevital~lc under long-term operation of said transition joint under hot water and steam effects, I
~o ll~e values providing serviceability of the weld joint under conditions, for example, of nuclcar reacl:or, until operational lifetime of nuclear reactor fuel channel is expired. Variable wall tllickness of said sleeves in the area of said lapping portion allows one to decrease radial dimcnsio1ls of sAid transition joint.
l~esidcs~ minimlJIl~ wall thickness of each said sleeve al lapping portion edge is not more thAn 2.~ % wall thickl-ess of the poltion free of lapping.
I~csidcs, ma~ing surfaces of said sleeves have steps alon~ entire len~th of said lapping porlio~
13csides~ cntire leng~h of mating surfaces for lapping ponion of said sleeves are made, al least, 20 in ~he folm of lwo cylindrical steps, one step being provided on each side of the lapping porlioll~ and tru~ated cone to intercollnecl said steps gradually.
13csidcs, to enhallce axl~n stren~lh~ In~xilllul~l wal ~ n~ o~cnch-s~ove ~tl~ppin~ po~i~n edgc is no~ less ~han thickness of its free lapping wall.
13~ides lo enllAIlce axial stren,~th and improve leaktightness of said diffusion weld joint said 25 r l~l~c~ an~ vallc~ .}re ~ iUIIII~ ~:J~
BRIEF DESCRIPTION OF THE DRAWINGS
1 he su~)stance of the present invention is explained by drawings, where Fi~,. I represcnts longiludillAI sec~ion view on said transition joint with stepped mating surfaces of said sleeves.
I;ig. 2 r cpl-esellls transition joint design oplion (longitudinal view), with mating surfaces of said ~o sleeves made in ~he form of two cylindrical stepsl one step being on each side of said lapping porlion and truncaled cone used to inlerconllect the steps gradually.
I i~. 3 r cpresents partial section vie\~ on lApping portion of said transition joint (scaled up).
I;i~,. 4 rcp~ a p~rtion of diffi :~ion we!d joint with sc~ t inl erlayer (scaled up).
Tr~nsition join~ IO weld stainless tubes and zirconium alloy tubes together is msde in the forrn .~s nl lappc~l diffiusion weld joinl and l~as enclosed sleeve 1 of zirconium alloy, and enclosin~
sleeve 2 of stainless steel. Ma~in~ surfaces of said sleeves are stepped alon~ entire lengt:h of sai(l lappin~ porlion, more particularly, steps 3 are provided on exterior surface of enclose(l slecve I of zilconium alloy, and sleps 4 mating steps 3 are provided on interior surface of ~RO~1: P~LIM~R Company ~HONt ~IU.: ~b4 b~5~1 Dec. 11 199~ 02:43P~1 P01 ~6' ' I
enCInS;I1~ S1eC~/C ~ Of SIa;nICSS ~teel. TI1C 1en8thS Of Stel1S 31 4 are eqUal~ and hei~ht of thc step~
;S abOUl a~; 6mall aS 10 - 20 % Wall ~l1;Ckne.~S al. SICCVe end, that jS free-laPP;ng. The th;CkneSS
Of SICCVCS 1. 2 jn Il-e POint Of laPPin8 ~ICC~eaSeS StCPW;Se grAdUal1Y alOn~ Cnt;re length Of t]1e I.~PPCd joinl bc~inning from maxi~ n V~ e~ thflt jS equal tO Or hiBher than Wall th;Ckne~S Of 0110 SIQeVC AI Ihe Cnd firee of lappill~ to ~minimum value, tha~ is cqual ~o 0.~ - 0.7 mm or i~ as Sl11;1l1 aS 2.~ ~~. Wa1l tl1;CkneSS at ~l1e f'reC-Ifll-Pjng enCI. Ridges S and ValleYS 6 of circumforelllial PrO~;Ie~ aI~eIna1h1~ IhrOUgh equal pit~hes ~re providcd 011 SlePS 3, 4 of laJlpcd joinl. Rid~es .~
on n~ sleps ~ and 4 cng~e corresl)ondinl3 valleys 6 tightly, without gaps. Surfaces of r;d~,CS ~ and VaIIC~S 6 are ;nterCOI111CCted thrOU~h d;f~US;Ot1 Weld;nL~ and form diffi~sion weld 10 jOjl11 7~ 111ade ;n t11C ffirn~ of solid inlel lAycr of no~ mc)re ~han ~ ~m thickness. Matinr sulf~ccs Of S.~;d SICCVC!; n1aY bC m~de in tl1e fOl-m of tWO CYI;I1driCaI gtePS, With One SleP arral1~,ed On CACh ~;dC Of Sai~l laPP;n~ POrliOI1, And trU1ICA1e~I COnC, u~ed ~o interconnect the ~leps ~radually.
Vari~t)lc W811 ~hick-les~ of said slecvcs in ~he are~ of lapping allows one to reduce Ihetmal stres~cs in the ~-c~ of lappin~ pollioll e~l~e a-ld, hence, reduce thennal ~tless concentration lS (poak slresse~ hat allows one lo climin~te joint teAr and ~ccelerated stress corrosion.
Minimun~ slcev~ wall thickness at l~)ping porlion cnds, thal is not more thhn 20 % thicknes~ of hc ficc-la~)pin~ wall, allow~ onc 1~) havc an~lher sleeve wall ~h;ckne~, thal is larger than hicknc~is vf thc W~lll a1 firee-lapping, end, lllat allows one l<- kecp transition i~-in~ stren~~lh equA]
~slo~ lle Icnglll when rcducing radial d;lnensions of 1he trAnsilion joint~ more particularly 20 llansilion jcint wi~ll thickness in tl-e pohlt O1 IAPPjn~~, as well a~ ~o reduce ~hcrrnal StlCSSes in 1a~ iO~l c~ es. ~
lic~llion of t he invcntiorl with ma~in~3 surfaces of t-ansitiol- joinl. along en1irc lAp~in6 Ic~h in ~hc forll~ of s~eps ~hh enga~ U eirclllnfcrential rid~es and valleys, alk)ws nnc t.o form a~al ~'lAl~yrintll ~ypc~ Iha~ allows to kccp Ic~kli~htnes~ even at low guali~y of diffll~ion wel~
I H~ PI~EFERR~D EMI30DIMrNT O~ I'HE INVENT]ON ~
A tr;~nS;1iOI1~ dcsigned for 3Oinin~?, xO mln 1.1). Z;rCOn;UIn allOY tUbe Of 4 mm Wflll thick:ness willl ~sO mm 1.1) ~tuinless steel lubc of 4 mm wall Ihickness TnternaJ d;~melCr Of the Sn;~l Iran~;;1;(?II ;O;n~ ;S ~0 m1n~ and Wall /llickness values o~ its fiee-lnpl in~, ends arc ctlufll to l~lbe ~o wall Ihickl~cs~ valucs~ i.e. 4 mm. Ma1in~ sulface~ of said sleevcs are stepped, with five ~tel)s.
l~ael~ CI~ len~ is 24 mm, maxim-l~n diamctcr of end step of ~aid ;~irconium alloy ~leeve bcing 89 ml11 willloll~ regard to rid~,CS ancl valleys (pure melal), and minimum diameter of end slep l cin~, Xu.9 mm (pUlC metal). Ring rid~,cs nnd valley~ are conical, rounded~ witb roundin~ radiu~
bein~ 2 mm, and ~he pitch bclween Ihc ridges bcing 1 5 mm. Ridge beight (valley depth) is 1 :15 n~lO I r~msi~i~ n j~-inl diametcr in Ihe alca o~' lapl~in6 i~ 92 mm, and the Icnyth of e~ch frcc:-lapl-in~ Cll(l ol' said transiti~n joint i~ 40 mm. Total length of ~ransiti~m joint i~; 200 mm.
Maxill1llm thicl;llcss ~>f said sleevc o f ~i~cc-nium fllloy (pu1e metal) io the arca of lappin~ 4.~
mm wilh w~ hicklless at the l'rec-lappinr~ cn~l being 4 mm, and minimum one i~ 0.4 mm, that is as s1t)all a~ 1() % thickness o1'1he wdll at the fiec-lapping end. Maximum tl ickness of ~aitl 4O ~;lecvc ol slail)lcs.c !;~eel is 4.6 ml-- (pUIe mctal), and minimun1 one is 0.5 mm, thal is A~ mall as I ~ ~ % t hicknc~s c~f the fi ee-la~)l)in~ ~vall.
FRO11: P~LI~ R Company CAHoo2N224586 l997-12-l2 Dec. 11 1997 02:44PM P02 - ~PPJ,1CAl31LIl Y OF l-~E INVENTION lN INDUS'rRY
Tl~c lrl~nsi~ic>n jc~ is uscd as l imetal in~;el1 in weldin~ st~ less steel tubcs t() zirconium AIlOy tobe.~i, t1)At allows on¢ to wcld tulcs m~dc of dissimilar mfltelials usin~, conventinnal wi~lely known wcl~iing Iccl1nique~;, I'or example, ar~,on-arc weldin~ and clectron beam weldin~ l~'or ~he r~ur~)o~e of this. first a lransition jl~in~ i~ manufacturc(~ ~lsin~ vacuum apparatus for di~llsion i cil)~~ weldcd. . . ~ o~ t~
Whcn opcr~ted un-3er condition~ of nuclear reactor at tc...l,e.~lures of l)ot wa~cr antl steam r~ fiom 2()() to ~iSO ~C, undel cyclic hcating and cooling, high axial then~lal s~esses are l(~ plOdU~;ed in j()itltS belwcen ~ircc~ m all<y and stail71ess steel due t~ more ~han thrce-fc-ld 1crence hctw~ell the coefrlcicnts of ther-nfll expansion for 7.irconium and ~tainless .stccl ul ~KI-lXNlOT type. However, m~cllanic~l join~, made in the form of steppcd en~,a~,emelll of allcrn;~ g ridL~cs ~nd valle)rs, in cssence takes up thcse strcsses comple/ely and, relievc~
rcs~e~c, lu ~I~e ~,rc~ extent, in s.~id dif~usion weld jOi11t ma(te in the form of corrosion re~i~tant ~5 soli(l di~ ion in(cllay~l of no( n~ore lllan S ~lm lhickness, this is a reason, why k)n~,-lern~
corlo~iot) s~ren~tlt~ sc~viceability al-<l reliability of said transition jOillt arc enhanced~ as h ~vholc Wl-lAl l~; CLAlMEn 1 2() l A 1la-lsitlOll jOillt lO weld stAil-lcss al1d zirconiunl alloy tubcs to~e~her, made in the form of l~p~ed ditfilsion weld j~;n~ betwecn ~lecvcs of the mctals corre~pondin~ to ~he mctHI~ o~o utlc~i to be wclded~ cnck~sing !;lecvc of s~id joint hein~, madc of stainless steel, ~enlire I&n h of IHp n~ pol~tion of maIing su~ACeS of said sleevcs i~ provided wi~/lte1natinL~ !
cn~in~ ridL~s and valleys,, wl)erein lapping difFusion weld jojnl is prg~ed with solid 2~ di~ sion in~crlayer of not m~re lllAn S Ilm thickness 2 lllc Irslnsitioll jOillt of Claim 1~ whelein lappin~3 arca of sHj~/eeves is of variat~lc w.qll IhiCknCS~;, WSIII ~hickness ~f one slccve dccreases, and,~t of annther one increases in ?,I)prt)~niate ma.nner.
IC tlallsi~iOIl joint of Claim 2~ whclein min~/waJI thickness of each ~ileevc al Is~ppin~
.~,() pol liOn end is n~t n~ore than 2~ % Ill~of the fi cc-lapping w~ll.
4. TI~e Iransition joint of Claim 2,~('1aim 3, whercill mating surlàccs ~)f s~id slceves ~--e slct)p~d alon~ clltire lcngll~2fpyin~
I hc: lri~nsi~ joint o~i~ 01 ~'IA;~ , whcrein mA~in6 surfaces oî said ~Iceves are mAde in ll~e ~ol-lo, ~1 Ic,~of two cylindrical steps al~ng entirc len~lh of lappin~, said steps l ein6 .~s pl~vi~led o~ch side of the lappinL~. alld truncated cone~ used to interc~)nncct thc s~eps ~radu~ i (~. ~smsi~ioll 30int of Claim 2 wl ercill each ~lecve maximum ~rSIIl ~hi~;kncs~ a~ l~ppin /p<)rlion end is nc I less than Ihe fi ec-lappin~ WAll thickncss 7. I he trnnsitio~ intofC.~nim I. ~vl~croin r id~ n~l vallo~4l~secirGu~.Aial.
7'R~NSlTlON JOINT TO WELD S1'AINLESS STEEL TUBE AND ZIRCONIIlM
ALLOY T-JBE TOG~THER
Fll~LD or; THE INVENTION
Ihc invel1lion relates to weldin~, and n1ore specifically to transition joints used as bimetal s inscr~ion piece h1 the course of weldin~ stainless steel tube and zirconium alloy tube to~clher, and may be applied in nuclear engineering and chemical machine-building.
PRIOR ART
A ~ransition joil1l used to weld stainless steel and zirconium tubes togelher is known (see ccr(ificate of autl1orship RU 1166948, published ] 5 July 1985). Said transition joint is madc in lo tl1e iOrl1- of lapped diffusion weld joint between stainless sleeve and zirconium sleeve using ~itaniul11 alloy h1lerlayer. Enclosin~ sleeve being made of st~inless sleel~ and steps being prc)vidcd Ol1 surfaces of the sleeves to be welded. Said sleeves are mounted so as the sleps of sald slainless slce~re al~ uisp~ace~ a~vu~h~ 3t;,F~ o~ ~F~._i~ alloy ~
l,imilcd scrvice lifetime under hot water and steam envi~onn.e.lt at up to 350 ~C temperaturc is he disadvanta~,c of above transition jOhlt resulted from reduced axial strength of said lapped dimlsiol1 weld joint. This is explained by the fact, that the ~lleJ,~,lh of said lapped diffillsion hondil1~ joint is pl ovided by close observance of all specified welding conditions. Thc strength of saicl di~usion weld joint may be reduced due to any negligible departure from said specified weldin~ conditiol1s, that is especially typical for quantity production. Besides, expensivel1ess of 20 said tlallsllion joirll ~lut~ lu l~ mourlt of tit~nium u~d, :~nd high l~c.r t~nn~llm~ l in mal1u~'acturing al e among another disadvantages of said transition joint.
/~ lransilion join~ to weld stainless steel tube and zirconium alloy tube together (see ccrl.ificatc of au~ -ship USSR 202404, published 29 June 1967) is the closest one to lhe invention as lo lhe tolali~y of essential features. Said transition joint is made in the form of lapped diffusion 2s wekl jOint of slecves of stainless stecl and zirconium alloy, enclosing sleeve being made of sl~inlcss sleel, and alternating en~aging rid~es and valleys are provided on the entire len~lh of lapl)il1~ portion Or the mating surfaces for the lapped joint between the sleeves. Said lapped difl'usiol1 weld joint has liquid diffusion interlayer of thickness ranging from 10 to 1.~0 ~m (liquid zirconiul11/il-on eutectic). Mechanical engagement of the sleeves is used to ensulc 30 su~rlcicl1l stren~tl1 of said transition joint, and leaktightness of said transition joint along enlirc are~ of said mechanical engagemenl is ensured by said diffiusion interlayer in the form of said liquid ~irconiun1/iron eutectic.
l,hni~cd service lifetime under hot water environment at more than 150 "C temperalule and failure ~o opera~e in hot water and steal11 at temperature ranging from 20û to 350 "(' due to low lony,-telm corrosion stren~sth is the disadvantage of said transition. Long-terrn corrosion slrcn~,ll1 is the s~length under lon~ exposure to corrosive environment, operating and thermal s~rcsses ~aid lappcd diffi~sion weld joint of sleeves of stainless steel and zirconium alloy usin~
liquid difl'usion interlayer of eutectic composition of 10 to 150 llm thickness is characlcri~cd \~ith low slren~lh and low corrosion resistance. Stress corrosion is the reason why said 40 C~ 'USiOIl weld jOil1t comes fractured after long operation. This is explained by stress pcaks pro(luced in lapping porlion ed~es of tubular lapped diffi~sion weld joints between dissimilar matclials witl1 clifferent coefficienls of thermal expansion. Said peak values are direclly plopollional t(- the stiffness of walls of the sleeves to be interconnected, and differcnce CA 02224~i86 1997 - 12 - 12 between the coefrlcients of thermal expansion. The larger sleeve wall thicl~ness, the hi~her slim1ess of said sleeves, hence, the higher the level of stresses in lapping portion ed~es. As sleeve wall thickness in said lappin~ portion decrea~es to values below wall thickness of lap-fiee slceve ends, axial strength of said weld joint reduces. An attempt to retain the required 5 axial slrctlgth of ~he weld joint causes increase in total thic~ esc of sleeve walls in lapping IlOlliOIl and transition joint cross dimensions, that is unacceptable for restricted design conditions, for example, such as nuclear reactor core. As hot water temperature increases ahove 200 "C, peak stresses (stress concentrators) in lapping poniOn edges rise in dircct pr()por~ic)n. As soon as said peak stresses increase above said diffusion interlayer strengtl1, lo weld joint tears in said lapping portion ed~es. Stress concentration rises in the place of tear, and slless colTosion rate increases, that results in rapid fracture of said thick liquid inter3ayer of eulectic composition.
DISCLOSURE OF THE INVENTION
Il is an ob3Prt n~'~h~ nresent invention to l~rovide a tubular transition joint of stainless steel and zilconium alloy joined together using lapped diffusion welding, with small thickness o~~iappin~s porlion wali and long-term service lifetime in hot water and steam at up to 35() ~C
tcmpcl atures.
Technical effcc.t of the invention produced in the course of the present invelltion h11plcmcl1tation lics in hi~her long-lerm corrosion strength of the transition joint exposed to hot 20 walcl ~nd steam at up to 350 ~C temperatures due to higher corrosion resistance and strenglh ol' s~id dif~usion weld joint. Said diffusion weld joint made using solid dif~tsion interlayer of thickness within ~ ~m, has high corrosion resistance in hol water and steam at up to 350 "C
teml-clature (obtained by experiments). ~sesides, high strength of said tubular lapped weld joint is plovl~ca US~ u;>ivr ~TItcrhjo~of' ~p ~o ~ r~ thi~knP.~;,c. in c~n-hin~tion with 25 mecl-anical en~a~sement, provided in the form of alternating ridges and valleys. As known fi om S~fllC of art, rather bigh strength of butt diffusion weld joint between titanium (the metal, which is in lhe same ~roup with zirconium) and stainless steel is provided by said solid diffi~sion inlerla~cl- of 3 ~ m thickness. Hnwevel, high residual thermal stresses across said diffusion inlellayel~ prodlJced due to two-fold di~erence between coefficients of thermal expansiol1 for ~o tital1iul11 and slail1less steel (~<Diffusiol1 welding of materials~ by Kazakov N. V., M, ~<Mashit1ostroel1ie~~ 1976, pp. 186 - 190), are the cause of spontaneous fracture of said lapped difl'usion weld joint between the above metals and said solid diffilsion interlayer in the course of coolin~,. Known are butt diffusion weld joints of zirconium and stainless steel with rather high sllcngth achieved due to thin interlayers, such as niob~um, copper, nickel, inserted belween ~he layers to be welded. however these joints are not applicable as tubular lapped joil1ls due to three-fold difference between the coefficients of thermal expansion for zirconium al1tl stainless stcels (K. Bhanumurthy, J. Krishnan, G.B. Kale, S. Banerjee, Journal of Nuclear Materials, v. 211 ( 1994), pp. 67 - 74. ~Transition joints between Zircaloy-2 and Stainless Sleel l~y ni~ sion I3Ondin~~). Said rcsidual thermal stresses portion is taken by mechanical 40 eny,a~,cmcn~ Or said transition joint, therc/ore, sald stresses are r~ v~ bid 3vli~-~.i,~ucion intcrlayel, despi~e the fact that there is three-fold difference between the coefficients of thermal expansiot1 for zilconium and stainless s~eel.
(~ombinalion ol' l1igh corrosion resistance and high strength for said solid diffi~sion intcrlaycr wilh nol more lhan 5 ~Im thickness provides long-term corrosion resistance to said tran~ition 4s joinl exposed to hot water and steam of up to 3~0 ~C temperature.
, .
The ~bove technical effect is reached by the fact that said transition joint used to weld tubes of slainless steel and zirconium alloy together which is made in the form of lappe~ diffi~sion weld jOillt of sleeves of the metals corresponding to the metals of the tubes to be welded, 1he enclnsin~ sleeve being made of stainless steel, and entire length of the lapping porfion of s n-atin~ sulfaces of said sleeves has allerl-ating ~.n~agin~ ridges and valleys.
I,apped diffusion weld joint has solid diffusion interlaycr of thickness not more ~han S llm.
13csidcs, to exclude ~ears of the weld joinl in lapping portion edges, variable thickness wall Or said slecves in Ihc area of lapping portion is implemented, so as while wall thickness of one slceve increases~ another one decreases in appropriate manner. This allows one, in combination ~o, with l)i~ll corrosioll resistance of said diffusion interlayer, to slow corrosion rate, whicll is inevital~lc under long-term operation of said transition joint under hot water and steam effects, I
~o ll~e values providing serviceability of the weld joint under conditions, for example, of nuclcar reacl:or, until operational lifetime of nuclear reactor fuel channel is expired. Variable wall tllickness of said sleeves in the area of said lapping portion allows one to decrease radial dimcnsio1ls of sAid transition joint.
l~esidcs~ minimlJIl~ wall thickness of each said sleeve al lapping portion edge is not more thAn 2.~ % wall thickl-ess of the poltion free of lapping.
I~csidcs, ma~ing surfaces of said sleeves have steps alon~ entire len~th of said lapping porlio~
13csides~ cntire leng~h of mating surfaces for lapping ponion of said sleeves are made, al least, 20 in ~he folm of lwo cylindrical steps, one step being provided on each side of the lapping porlioll~ and tru~ated cone to intercollnecl said steps gradually.
13csidcs, to enhallce axl~n stren~lh~ In~xilllul~l wal ~ n~ o~cnch-s~ove ~tl~ppin~ po~i~n edgc is no~ less ~han thickness of its free lapping wall.
13~ides lo enllAIlce axial stren,~th and improve leaktightness of said diffusion weld joint said 25 r l~l~c~ an~ vallc~ .}re ~ iUIIII~ ~:J~
BRIEF DESCRIPTION OF THE DRAWINGS
1 he su~)stance of the present invention is explained by drawings, where Fi~,. I represcnts longiludillAI sec~ion view on said transition joint with stepped mating surfaces of said sleeves.
I;ig. 2 r cpl-esellls transition joint design oplion (longitudinal view), with mating surfaces of said ~o sleeves made in ~he form of two cylindrical stepsl one step being on each side of said lapping porlion and truncaled cone used to inlerconllect the steps gradually.
I i~. 3 r cpresents partial section vie\~ on lApping portion of said transition joint (scaled up).
I;i~,. 4 rcp~ a p~rtion of diffi :~ion we!d joint with sc~ t inl erlayer (scaled up).
Tr~nsition join~ IO weld stainless tubes and zirconium alloy tubes together is msde in the forrn .~s nl lappc~l diffiusion weld joinl and l~as enclosed sleeve 1 of zirconium alloy, and enclosin~
sleeve 2 of stainless steel. Ma~in~ surfaces of said sleeves are stepped alon~ entire lengt:h of sai(l lappin~ porlion, more particularly, steps 3 are provided on exterior surface of enclose(l slecve I of zilconium alloy, and sleps 4 mating steps 3 are provided on interior surface of ~RO~1: P~LIM~R Company ~HONt ~IU.: ~b4 b~5~1 Dec. 11 199~ 02:43P~1 P01 ~6' ' I
enCInS;I1~ S1eC~/C ~ Of SIa;nICSS ~teel. TI1C 1en8thS Of Stel1S 31 4 are eqUal~ and hei~ht of thc step~
;S abOUl a~; 6mall aS 10 - 20 % Wall ~l1;Ckne.~S al. SICCVe end, that jS free-laPP;ng. The th;CkneSS
Of SICCVCS 1. 2 jn Il-e POint Of laPPin8 ~ICC~eaSeS StCPW;Se grAdUal1Y alOn~ Cnt;re length Of t]1e I.~PPCd joinl bc~inning from maxi~ n V~ e~ thflt jS equal tO Or hiBher than Wall th;Ckne~S Of 0110 SIQeVC AI Ihe Cnd firee of lappill~ to ~minimum value, tha~ is cqual ~o 0.~ - 0.7 mm or i~ as Sl11;1l1 aS 2.~ ~~. Wa1l tl1;CkneSS at ~l1e f'reC-Ifll-Pjng enCI. Ridges S and ValleYS 6 of circumforelllial PrO~;Ie~ aI~eIna1h1~ IhrOUgh equal pit~hes ~re providcd 011 SlePS 3, 4 of laJlpcd joinl. Rid~es .~
on n~ sleps ~ and 4 cng~e corresl)ondinl3 valleys 6 tightly, without gaps. Surfaces of r;d~,CS ~ and VaIIC~S 6 are ;nterCOI111CCted thrOU~h d;f~US;Ot1 Weld;nL~ and form diffi~sion weld 10 jOjl11 7~ 111ade ;n t11C ffirn~ of solid inlel lAycr of no~ mc)re ~han ~ ~m thickness. Matinr sulf~ccs Of S.~;d SICCVC!; n1aY bC m~de in tl1e fOl-m of tWO CYI;I1driCaI gtePS, With One SleP arral1~,ed On CACh ~;dC Of Sai~l laPP;n~ POrliOI1, And trU1ICA1e~I COnC, u~ed ~o interconnect the ~leps ~radually.
Vari~t)lc W811 ~hick-les~ of said slecvcs in ~he are~ of lapping allows one to reduce Ihetmal stres~cs in the ~-c~ of lappin~ pollioll e~l~e a-ld, hence, reduce thennal ~tless concentration lS (poak slresse~ hat allows one lo climin~te joint teAr and ~ccelerated stress corrosion.
Minimun~ slcev~ wall thickness at l~)ping porlion cnds, thal is not more thhn 20 % thicknes~ of hc ficc-la~)pin~ wall, allow~ onc 1~) havc an~lher sleeve wall ~h;ckne~, thal is larger than hicknc~is vf thc W~lll a1 firee-lapping, end, lllat allows one l<- kecp transition i~-in~ stren~~lh equA]
~slo~ lle Icnglll when rcducing radial d;lnensions of 1he trAnsilion joint~ more particularly 20 llansilion jcint wi~ll thickness in tl-e pohlt O1 IAPPjn~~, as well a~ ~o reduce ~hcrrnal StlCSSes in 1a~ iO~l c~ es. ~
lic~llion of t he invcntiorl with ma~in~3 surfaces of t-ansitiol- joinl. along en1irc lAp~in6 Ic~h in ~hc forll~ of s~eps ~hh enga~ U eirclllnfcrential rid~es and valleys, alk)ws nnc t.o form a~al ~'lAl~yrintll ~ypc~ Iha~ allows to kccp Ic~kli~htnes~ even at low guali~y of diffll~ion wel~
I H~ PI~EFERR~D EMI30DIMrNT O~ I'HE INVENT]ON ~
A tr;~nS;1iOI1~ dcsigned for 3Oinin~?, xO mln 1.1). Z;rCOn;UIn allOY tUbe Of 4 mm Wflll thick:ness willl ~sO mm 1.1) ~tuinless steel lubc of 4 mm wall Ihickness TnternaJ d;~melCr Of the Sn;~l Iran~;;1;(?II ;O;n~ ;S ~0 m1n~ and Wall /llickness values o~ its fiee-lnpl in~, ends arc ctlufll to l~lbe ~o wall Ihickl~cs~ valucs~ i.e. 4 mm. Ma1in~ sulface~ of said sleevcs are stepped, with five ~tel)s.
l~ael~ CI~ len~ is 24 mm, maxim-l~n diamctcr of end step of ~aid ;~irconium alloy ~leeve bcing 89 ml11 willloll~ regard to rid~,CS ancl valleys (pure melal), and minimum diameter of end slep l cin~, Xu.9 mm (pUlC metal). Ring rid~,cs nnd valley~ are conical, rounded~ witb roundin~ radiu~
bein~ 2 mm, and ~he pitch bclween Ihc ridges bcing 1 5 mm. Ridge beight (valley depth) is 1 :15 n~lO I r~msi~i~ n j~-inl diametcr in Ihe alca o~' lapl~in6 i~ 92 mm, and the Icnyth of e~ch frcc:-lapl-in~ Cll(l ol' said transiti~n joint i~ 40 mm. Total length of ~ransiti~m joint i~; 200 mm.
Maxill1llm thicl;llcss ~>f said sleevc o f ~i~cc-nium fllloy (pu1e metal) io the arca of lappin~ 4.~
mm wilh w~ hicklless at the l'rec-lappinr~ cn~l being 4 mm, and minimum one i~ 0.4 mm, that is as s1t)all a~ 1() % thickness o1'1he wdll at the fiec-lapping end. Maximum tl ickness of ~aitl 4O ~;lecvc ol slail)lcs.c !;~eel is 4.6 ml-- (pUIe mctal), and minimun1 one is 0.5 mm, thal is A~ mall as I ~ ~ % t hicknc~s c~f the fi ee-la~)l)in~ ~vall.
FRO11: P~LI~ R Company CAHoo2N224586 l997-12-l2 Dec. 11 1997 02:44PM P02 - ~PPJ,1CAl31LIl Y OF l-~E INVENTION lN INDUS'rRY
Tl~c lrl~nsi~ic>n jc~ is uscd as l imetal in~;el1 in weldin~ st~ less steel tubcs t() zirconium AIlOy tobe.~i, t1)At allows on¢ to wcld tulcs m~dc of dissimilar mfltelials usin~, conventinnal wi~lely known wcl~iing Iccl1nique~;, I'or example, ar~,on-arc weldin~ and clectron beam weldin~ l~'or ~he r~ur~)o~e of this. first a lransition jl~in~ i~ manufacturc(~ ~lsin~ vacuum apparatus for di~llsion i cil)~~ weldcd. . . ~ o~ t~
Whcn opcr~ted un-3er condition~ of nuclear reactor at tc...l,e.~lures of l)ot wa~cr antl steam r~ fiom 2()() to ~iSO ~C, undel cyclic hcating and cooling, high axial then~lal s~esses are l(~ plOdU~;ed in j()itltS belwcen ~ircc~ m all<y and stail71ess steel due t~ more ~han thrce-fc-ld 1crence hctw~ell the coefrlcicnts of ther-nfll expansion for 7.irconium and ~tainless .stccl ul ~KI-lXNlOT type. However, m~cllanic~l join~, made in the form of steppcd en~,a~,emelll of allcrn;~ g ridL~cs ~nd valle)rs, in cssence takes up thcse strcsses comple/ely and, relievc~
rcs~e~c, lu ~I~e ~,rc~ extent, in s.~id dif~usion weld jOi11t ma(te in the form of corrosion re~i~tant ~5 soli(l di~ ion in(cllay~l of no( n~ore lllan S ~lm lhickness, this is a reason, why k)n~,-lern~
corlo~iot) s~ren~tlt~ sc~viceability al-<l reliability of said transition jOillt arc enhanced~ as h ~vholc Wl-lAl l~; CLAlMEn 1 2() l A 1la-lsitlOll jOillt lO weld stAil-lcss al1d zirconiunl alloy tubcs to~e~her, made in the form of l~p~ed ditfilsion weld j~;n~ betwecn ~lecvcs of the mctals corre~pondin~ to ~he mctHI~ o~o utlc~i to be wclded~ cnck~sing !;lecvc of s~id joint hein~, madc of stainless steel, ~enlire I&n h of IHp n~ pol~tion of maIing su~ACeS of said sleevcs i~ provided wi~/lte1natinL~ !
cn~in~ ridL~s and valleys,, wl)erein lapping difFusion weld jojnl is prg~ed with solid 2~ di~ sion in~crlayer of not m~re lllAn S Ilm thickness 2 lllc Irslnsitioll jOillt of Claim 1~ whelein lappin~3 arca of sHj~/eeves is of variat~lc w.qll IhiCknCS~;, WSIII ~hickness ~f one slccve dccreases, and,~t of annther one increases in ?,I)prt)~niate ma.nner.
IC tlallsi~iOIl joint of Claim 2~ whclein min~/waJI thickness of each ~ileevc al Is~ppin~
.~,() pol liOn end is n~t n~ore than 2~ % Ill~of the fi cc-lapping w~ll.
4. TI~e Iransition joint of Claim 2,~('1aim 3, whercill mating surlàccs ~)f s~id slceves ~--e slct)p~d alon~ clltire lcngll~2fpyin~
I hc: lri~nsi~ joint o~i~ 01 ~'IA;~ , whcrein mA~in6 surfaces oî said ~Iceves are mAde in ll~e ~ol-lo, ~1 Ic,~of two cylindrical steps al~ng entirc len~lh of lappin~, said steps l ein6 .~s pl~vi~led o~ch side of the lappinL~. alld truncated cone~ used to interc~)nncct thc s~eps ~radu~ i (~. ~smsi~ioll 30int of Claim 2 wl ercill each ~lecve maximum ~rSIIl ~hi~;kncs~ a~ l~ppin /p<)rlion end is nc I less than Ihe fi ec-lappin~ WAll thickncss 7. I he trnnsitio~ intofC.~nim I. ~vl~croin r id~ n~l vallo~4l~secirGu~.Aial.
Claims (7)
1. A transition joint 10 weld stainless and zirconium alloy tubes together, made in the from of lapped diffusion weld joint between sleeves of the metals corresponding the metal of the tubes to be welded,enclosing sleeve of said joint being made of stainless steel, and entire length of lapping portion of mating surfaces of said sleeves is provided with alternating engaging ridges and valleys, wherein lapping diffusion weld joint is provided with solid diffusion interlayer of not more than 5 µm thickness.
2. The transition joint of Claim 1, wherein lapping area of said sleeves is of variable wall thickness, wall thickness of one sleeve decreases, and that of another one increases in appropriate manner.
3. The transition joint of Claim 2, wherein minimum wall thickness of each sleeve at lapping portion end is not more than 25 % thickness of the free-lapping wall.
4. The transition joint of Claim 2 or claim 3, wherein mating surfaces of said sleeves are stepped along entire length of lapping.
5. The transition joint of Claim 2 or Claim 3, wherein mating surfaces of said sleeves are made in the form, at least of two cylindrical steps along, entire length of lapping, said steps being provided on each side of the lapping, and truncated cone, used to interconnect the steps gradually.
6. The transition joint of Claim 2, wherein each sleeve maximum wall thickness at lapping portion end is not less than the free-lapping wall thickness.
7. The transition joint of Claim 1, wherein ridges and valleys are circumferential.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU95109815 | 1995-06-20 | ||
| RU9595109815A RU2085350C1 (en) | 1995-06-20 | 1995-06-20 | Adapter for welding stainless steel pipes with zirconium alloy pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2224586A1 true CA2224586A1 (en) | 1997-01-09 |
Family
ID=20168864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002224586A Abandoned CA2224586A1 (en) | 1995-06-20 | 1996-06-20 | Fitting for use in welding stainless steel pipes with zirconium alloy pipes |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR100325783B1 (en) |
| CA (1) | CA2224586A1 (en) |
| RU (1) | RU2085350C1 (en) |
| WO (1) | WO1997001057A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7922065B2 (en) * | 2004-08-02 | 2011-04-12 | Ati Properties, Inc. | Corrosion resistant fluid conducting parts, methods of making corrosion resistant fluid conducting parts and equipment and parts replacement methods utilizing corrosion resistant fluid conducting parts |
| US10118259B1 (en) | 2012-12-11 | 2018-11-06 | Ati Properties Llc | Corrosion resistant bimetallic tube manufactured by a two-step process |
| CN112548278A (en) * | 2020-11-13 | 2021-03-26 | 中国原子能科学研究院 | Boss butt joint structure of reactor core assembly and welding method thereof |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000005816A (en) * | 1998-06-22 | 2000-01-11 | Usui Internatl Ind Co Ltd | Multi-wound stainless steel pipe |
| EP1167852A3 (en) * | 2000-05-18 | 2003-11-12 | Daido Tokushuko Kabushiki Kaisha | Diffusion bonded metal pipe, diffusion bonded metal pipe expansion method, and method for inspecting diffusion bonded metal pipes |
| US8695868B2 (en) | 2006-08-30 | 2014-04-15 | Fluor Technologies Corporation | Compositions and methods for dissimilar material welding |
| CN101382216B (en) * | 2007-09-05 | 2010-08-11 | 左铁军 | Counter bending copper-aluminium tube joint, method for producing same and special core rod |
| RU2620402C2 (en) * | 2015-09-07 | 2017-05-25 | Открытое акционерное общество "Композит" (ОАО "Композит") | Billet for diffusion welding of titan-aluminium adapter |
| CN108436241B (en) * | 2018-02-11 | 2020-08-14 | 佛山市智晓科技服务有限公司 | Resistance welding method |
| JP7115343B2 (en) * | 2019-02-01 | 2022-08-09 | トヨタ自動車株式会社 | Method for manufacturing drive drum |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1570267A (en) * | 1977-07-20 | 1980-06-25 | Kloeckner Werke Ag | Method of producing a corrosion-resistant compound material |
| DE3115393C2 (en) * | 1981-04-16 | 1984-11-15 | W.C. Heraeus Gmbh, 6450 Hanau | Method of manufacturing a pipe connector |
| SU1261764A1 (en) * | 1982-03-26 | 1986-10-07 | Латвийский Ордена Трудового Красного Знамени Государственный Университет Им.П.Стучки | Method of cold welding of tubes |
| DE3212768A1 (en) * | 1982-04-06 | 1983-12-08 | Brown, Boveri & Cie Ag, 6800 Mannheim | WELDING PROCESS |
-
1995
- 1995-06-20 RU RU9595109815A patent/RU2085350C1/en not_active IP Right Cessation
-
1996
- 1996-06-20 WO PCT/RU1996/000166 patent/WO1997001057A1/en not_active Application Discontinuation
- 1996-06-20 KR KR1019970709560A patent/KR100325783B1/en not_active IP Right Cessation
- 1996-06-20 CA CA002224586A patent/CA2224586A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7922065B2 (en) * | 2004-08-02 | 2011-04-12 | Ati Properties, Inc. | Corrosion resistant fluid conducting parts, methods of making corrosion resistant fluid conducting parts and equipment and parts replacement methods utilizing corrosion resistant fluid conducting parts |
| US8973810B2 (en) | 2004-08-02 | 2015-03-10 | Ati Properties, Inc. | Corrosion resistant fluid conducting parts, methods of making corrosion resistant fluid conducting parts and equipment and parts replacement methods utilizing corrosion resistant fluid conducting parts |
| US9662740B2 (en) | 2004-08-02 | 2017-05-30 | Ati Properties Llc | Method for making corrosion resistant fluid conducting parts |
| US10118259B1 (en) | 2012-12-11 | 2018-11-06 | Ati Properties Llc | Corrosion resistant bimetallic tube manufactured by a two-step process |
| CN112548278A (en) * | 2020-11-13 | 2021-03-26 | 中国原子能科学研究院 | Boss butt joint structure of reactor core assembly and welding method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| RU95109815A (en) | 1997-04-10 |
| KR19990028249A (en) | 1999-04-15 |
| RU2085350C1 (en) | 1997-07-27 |
| WO1997001057A1 (en) | 1997-01-09 |
| KR100325783B1 (en) | 2002-06-26 |
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