Peipi ea tšepe e otlolohileng ke phala ea tšepe e nang le seam e cheselitsoeng e bapileng le tataiso ea longitudinal ea phala ea tšepe. Hangata arotsoe ka metric tjheseletsa tšepe liphaephe tsa motlakase tjheseletsa liphaephe tšesaane-marako, liphaephe tse tsidifatsong transformer, joalo-joalo Tshebetso ea tlhahiso e otlolohileng seam high-frequency welded tšepe liphaephe na le litšobotsi tsa tshebetso e batlang e le bonolo le ka potlako e tsoelang pele tlhahiso. Li sebelisoa haholo ho tsa kaho ea sechaba, petrochemical, indasteri e bobebe, le mafapha a mang. E sebelisoa haholo ho tsamaisa metsi a khatello e tlase kapa ho etsoa likarolo tse fapaneng tsa boenjiniere le lihlahisoa tse bobebe tsa indasteri..

1. Phallo ea ts'ebetso ea tlhahiso ea seam e otlolohileng e phahameng maqhubu a welded tšepe phala

Peipi ea tšepe e otlolohileng e entsoeng ka seam e entsoe ka ho pitikisa mothapo o molelele oa tšepe oa mofuta o itseng hore e be sebopeho se chitja sa tšupu ka yuniti ea tjheseletsa ea maqhubu a phahameng ebe o tjheseletsa seam e otlolohileng ho etsa phala ea tšepe. Sebōpeho sa phala ea tšepe e ka ba chitja, lisekoere, kapa sebopeho se khethehileng, se itšetlehileng ka boholo le ho pota ka mor'a ho cheselletsa. Thepa e ka sehloohong ea lipeipi tsa tšepe tse cheselitsoeng ke tšepe e tlaase ea carbon le tšepe e tlaase ea alloy kapa lisebelisoa tse ling tsa tšepe tse nang leσs≤300N/mm2, leσs≤500N/mm2..

2. High-frequency welding

High-frequency welding e thehiloe holim'a molao-motheo oa ho kenngoa ha motlakase le phello ea letlalo, phello e haufi, le phello ea eddy ea hona joale ea mocheso oa litefello tsa AC ho conductor e le hore tšepe e pheletsong ea weld e futhumale sebakeng sa heno ho ea sebakeng se qhibilihisitsoeng. Ka mor'a ho fetisoa ke rolara, weld ea butt ke inter-crystalline. E kopantsoe ho fihlela sepheo sa ho cheselletsa. Welding ea maqhubu a phahameng ke mofuta oa tjheseletsa ea induction (kapa khatello ea khokahano). Ha e hloke li-weld fillers, ha e na spatter ea welding, e na le libaka tse tšesaane tse anngoeng ke mocheso, libopeho tse ntle tsa welding, le thepa e ntle ea mochini oa welding. Ka hona, e ratoa ha ho etsoa liphaephe tsa tšepe. Mefuta e mengata ea lisebelisoa..

High-frequency welding ea lipeipi tsa tšepe o sebelisa phello ea letlalo le phello e haufi ea alternating current. Ka mor'a hore tšepe (e hlobolisa) e phuthetsoe 'me e thehoe, ho thehoa tube e chitja e se nang letho e nang le karolo e robehileng, e potolohang ka har'a tube e haufi le bohareng ba coil induction. Kapa sehlopha sa li-resistors (lithupa tsa makenete). Mohanyetsi le ho bula ha tube e se nang letho ho theha loop ea motlakase ea motlakase. Tlas'a ts'ebetso ea phello ea letlalo le phello e haufi, moeli oa ho buloa ho se nang letho ha tube ho hlahisa phello e matla le e tebileng ea mocheso, ho etsa hore moeli oa weld o futhumale ka potlako ho mocheso o hlokahalang bakeng sa ho cheselletsa le ho fetisoa ke mochine oa khatello. tšepe e qhibilihisitsoeng e finyella ho kopanya ha granular 'me e theha sekontiri se matla ka mor'a ho pholile.

3. Setsi sa phaephe se cheselitsoeng ka maqhubu a phahameng

Ts'ebetso ea ho cheselletsa maqhubu a phahameng a liphaephe tsa tšepe tse otlolohileng tsa seam e phetheloa ka liphaephe tse cheselitsoeng ka maqhubu a phahameng. Liphaephe tse cheselitsoeng ka maqhubu a phahameng hangata li na le sebopeho sa roll, welding e phahameng-frequency, extrusion, cooling, sizing, flying saw cut, le likarolo tse ling. Karolo e ka pele ea yuniti e na le sekoti sa polokelo, 'me karolo e ka morao ea yuniti e na le foreimi ea tšepe e fetolang phala; Karolo ea motlakase haholo-holo e na le jenereithara ea maqhubu a phahameng haholo, jenereithara e tsosang takatso ea DC, le sesebelisoa sa ho laola othomathike.

4. High-frequency excitation circuit

The high-frequency excitation circuit (e tsejoang hape e le high-frequency oscillation circuit) e entsoe ka tube e kholo ea elektronike le tanka ea oscillation e kentsoeng ka jenereithara e phahameng ea maqhubu. E sebelisa phello ea amplification ea tube ea elektronike. Ha tube ea electron e hokahane le filament le anode, anode ke lets'oao la phallo le khutlisetsoa hekeng, 'me le etsa leqhubu la boithatelo la oscillation. Boholo ba maqhubu a ho hlasimolla bo ipapisitse le liparamente tsa motlakase (voltage, hajoale, capacitance, le inductance) ea tanka ea oscillation..

5. Ts'ebetso e otlolohileng ea tšepe ea seam seam e phahameng ea maqhubu a holimo

5.1 Taolo ea lekhalo la weld

Tšepe ea strip e tšeloa ka har'a phaephe e cheselitsoeng. Ka mor'a ho pitikisoa ke li-rollers tse ngata, tšepe ea hlobo e phuthoa butle-butle ho etsa tube e chitja e se nang letho e nang le lekhalo le bulehileng. Fetola palo ea phokotso ea rolara ea extrusion ho laola lekhalo la weld pakeng tsa 1 le 3 mm. 'Me u etse hore lipheletsong ka bobeli tsa boema-kepe ba li-welding li hlake. Haeba lekhalo le le leholo haholo, phello e haufi e tla fokotseha, mocheso oa hona joale oa eddy o tla be o sa lekana, 'me ho kopana ha kristale ea weld ho tla fokola, ho fella ka ho hloka fusion kapa ho phunyeha. Haeba lekhalo le le lenyenyane haholo, phello e haufi e tla eketseha 'me mocheso oa welding o tla ba o phahameng haholo, o etsa hore weld e chese; kapa weld e tla etsa sekoti se tebileng ka mor'a hore e ntšetsoe ka ntle le ho phuthoa, e amang boleng ba holim'a tjheseletsa..

5.2 Taolo ea mocheso oa welding

Mocheso oa tjheseletsa o angoa haholo ke matla a mocheso a matla a hona joale a eddy. Ho ea ka mokhoa oa (2), ho ka bonoa hore matla a mocheso oa motlakase oa motlakase oa eddy o ameha haholo-holo ke maqhubu a hona joale. Mocheso oa motlakase oa eddy o lekana le lisekoere tsa maqhubu a ts'oaetso ea hona joale, 'me maqhubu a hona joale a ho hlasimolla a ameha ka makhetlo a mangata. Litlamorao tsa voltage, hajoale, capacitance, le inductance. Foromo ya maqhubu a excitation ke f=1/[2π(CL)1/2]…(1) Moo: f-excitation frequency (Hz); C-capacitance (F) ho loop excitation, capacitance = matla/ ​​Voltage; L-inductance ho loop e tsosang takatso, inductance = magnetic flux / hona joale. Ho ka bonoa ho tsoa ho foromo e kaholimo hore maqhubu a ho hlasimolla a lekana ka tsela e fapaneng le motso oa lisekoere oa capacitance le inductance ho loop ea excitation, kapa a lekana ka kotloloho le motso oa lisekoere oa motlakase le oa hajoale. Ha feela capacitance le inductance ka lupu fetotsoe, motlakase inductive kapa hona joale ka fetola maqhubu excitation, ka tsela eo ho finyella morero oa ho laola mocheso tjheseletsa. Bakeng sa tšepe e tlaase ea carbon, mocheso oa tjheseletsa o laoloa ho 1250 ~ 1460℃, e ka kopanang le tlhoko ea ho kenella ka tjheseletsa ea botenya ba phala ea 3 ~ 5mm. Ho phaella moo, mocheso oa tjheseletsa o ka boela oa finyelloa ka ho fetola lebelo la ho tjheseletsa. Ha mocheso oa ho kenya o sa lekana, moeli o futhumetseng oa weld o ke ke oa fihla mocheso oa ho chesella, 'me mohaho oa tšepe o lula o tiile, o fella ka fusion e sa fellang kapa welding e sa fellang; ha mocheso oa ho kenya o sa lekana, moeli o futhumetseng oa weld o feta mocheso oa ho cheselletsa, ho fella ka ho chesa ho Fetisisa kapa marotholi a qhibilihisitsoeng a tla etsa hore weld e etse lesoba le qhibilihisitsoeng..

5.3 Taolo ea matla a extrusion

Ka mor'a hore mathōko a mabeli a tube e se nang letho a futhumale ho mocheso oa ho tjheseletsa, a petetsoa ke roller ea ho petetsa ho etsa lithollo tsa tšepe tse tloaelehileng tse phunyeletsang le ho phatsima, 'me qetellong li etsa weld e matla. Haeba matla a extrusion a le monyenyane haholo, palo ea likristale tse tloaelehileng tse entsoeng e tla ba tse nyenyane, matla a tšepe ea weld a tla fokotseha, 'me ho phunyeha ho tla etsahala ka mor'a khatello ea kelello; haeba matla a extrusion a le maholo haholo, tšepe e qhibilihisitsoeng e tla hatelloa ka ntle ho weld, e ke keng ea fokotsa feela Matla a chese a fokotsehile, 'me palo e kholo ea li-burrs tse ka hare le tsa ka ntle li tla hlahisoa, esita le ho baka liphoso tse kang tjheseletsa lap seams..

5.4 Taolo ea boemo ba coil induction induction high-frequency

Coil induction induction e phahameng e lokela ho ba haufi ka hohle kamoo ho ka khonehang ho boemo ba "squeeze roller". Haeba coil ea induction e le hōle le "extrusion roller", nako ea ho futhumatsa e sebetsang e tla ba nako e telele, sebaka se amehileng ke mocheso se tla ba se pharaletseng, 'me matla a weld a tla fokotseha; ho fapana le hoo, moeli oa weld o ke ke oa futhumala ka ho lekaneng 'me sebopeho se tla fokola ka mor'a extrusion..

5.5 Mohanyetsi ke e 'ngoe kapa sehlopha sa melamu e khethehileng ea makenete bakeng sa liphaephe tse cheselitsoeng. Sebaka sa sefapano sa mohanyetsi hangata ha sea lokela ho ba ka tlase ho 70% ea sebaka sa sefapano sa bophara bo ka hare ba pipe ea tšepe. Mosebetsi oa eona ke ho theha loop ea motlakase ea motlakase e nang le coil ea induction, moeli oa phala e se nang letho ea seam, le molamu oa makenete. , ho hlahisa phello e haufi, mocheso oa hona joale oa eddy o tsepamisitsoe haufi le moeli oa tube e se nang letho, e leng se etsang hore moeli oa tube o se nang letho o futhumale ho mocheso oa ho tjheseletsa. Mohanyetsi o huleloa ka hare ho tube e se nang letho ka terata ea tšepe, 'me boemo ba eona bo bohareng bo lokela ho ba bo tsitsitseng haufi le setsi sa extrusion roller. Ha mochine o buloa, ka lebaka la ho tsamaea ka potlako ha tube e se nang letho, mohanyetsi o na le tahlehelo e kholo ka lebaka la ho ferekana ha lerako le ka hare la tube e se nang letho 'me e hloka ho nkeloa sebaka khafetsa..

5.6 Ka mor'a ho cheselletsa le ho extrusion, maqeba a li-weld a tla hlahisoa 'me a hloka ho tlosoa. Mokhoa oa ho hloekisa ke ho lokisa sesebelisoa holim'a foreimi le ho itšetleha ka ho tsamaea ka potlako ha phala e cheselitsoeng ho theola lebali la weld. Lithako tse ka har'a lipeipi tse cheselitsoeng hangata ha li tlosoe..

6. Litlhoko tsa tekheniki le tlhahlobo ea boleng ba liphaephe tse cheselitsoeng ka maqhubu a phahameng

Ho ea ka tekanyo ea GB3092 "Welded Steel Pipe for Low-Pressure Fluid Transport" e tloaelehileng, bophara bo tloaelehileng ba phala e cheselitsoeng ke 6 ~ 150mm, botenya ba lebota ka lebitso ke 2.0 ~ 6.0mm, bolelele ba phala e cheselitsoeng hangata ke 4 ~ 10 metres mme e ka hlalosoa ka bolelele bo tsitsitseng kapa bolelele bo bongata Factory. Boleng ba bokaholimo ba lipeipi tsa tšepe bo lokela ho ba boreleli, 'me likoli tse kang ho mena, mapetsong, delamination, le welding lap ha lia lumelloa. Bokaholimo ba phala ea tšepe bo lumelloa ho ba le mefokolo e nyane joalo ka mengopo, likhopo, li-weld dislocations, cheso, le maqeba a sa feteng ho kheloha ho hotle ha botenya ba lerako. Botenya ba lerako ka weld le ho ba teng ha ka hare weld mekoallo lumelloa. Lipeipi tsa tšepe tse cheselitsoeng li lokela ho etsa liteko tsa ts'ebetso ea mochini, liteko tsa ho batalatsa, le liteko tsa katoloso, 'me li tlameha ho fihlela litlhoko tse boletsoeng maemong. Pipe ea tšepe e lokela ho khona ho mamella khatello e itseng ea ka hare. Haeba ho hlokahala, teko ea khatello ea 2.5Mpa e lokela ho etsoa ho boloka ho se na ho lutla motsotso o le mong. E lumelloa ho sebelisa mokhoa oa hona joale oa ho lemoha phoso ea eddy sebakeng sa tlhahlobo ea hydrostatic. Ho fumanoa ha liphoso tsa Eddy hona joale ho etsoa ke GB7735 e tloaelehileng "Eddy Current Flaw Detection Method for Steel Pipes". Mokhoa oa hona joale oa ho lemoha phoso ke ho lokisa probe holim'a foreimi, ho boloka sebaka sa 3 ~ 5mm pakeng tsa ho lemoha phoso le weld, le ho itšetleha ka ho tsamaea ka potlako ha phala ea tšepe ho etsa tlhahlobo e feletseng ea weld. Letšoao la ho lemoha phoso le sebetsoa ka bo eona 'me le hlophisoa ka bo eona ka mochini oa eddy oa hona joale oa ho lemoha liphoso. Ho fihlela sepheo sa ho lemoha liphoso. Ke phala ea tšepe e entsoeng ka lipoleiti tsa tšepe kapa likhoele tsa tšepe tse kobehang ebe li cheseha. Ts'ebetso ea tlhahiso ea liphaephe tsa tšepe tse cheselitsoeng li bonolo, katleho ea tlhahiso e phahame, ho na le mefuta e mengata le litlhaloso, 'me matsete a thepa a nyenyane, empa matla a kakaretso a tlase ho feta a liphaephe tsa tšepe tse se nang moeli. Ho tloha lilemong tsa bo-1930, ka tsoelo-pele e potlakileng ea tlhahiso e tsoelang pele ea tšepe ea boleng bo holimo le tsoelo-pele ea theknoloji ea ho cheselletsa le ho hlahloba, boleng ba li-welds bo 'nile ba tsoela pele ho ntlafala,' me mefuta le litlhaloso tsa liphaephe tsa tšepe tse cheselitsoeng li eketsehile letsatsi le letsatsi. , ho nkela lipeipi tsa tšepe tse e-s’o phethoe libakeng tse ntseng li eketseha. Peipi ea tšepe ea ho roka. Liphaephe tsa tšepe tse cheselitsoeng li arotsoe ka liphaephe tse otlolohileng tsa seam, le liphaephe tse cheselitsoeng ka spiral ho latela mofuta oa weld. Ts'ebetso ea tlhahiso ea phala e otlolohileng ea seam welded e bonolo, katleho ea tlhahiso e phahame, litšenyehelo li tlase, 'me tsoelo-pele e potlakile. Matla a lipeipi tse cheselitsoeng ka spiral hangata a phahame ho feta a liphaephe tse otlolohileng tsa seam. Liphaephe tse cheselitsoeng tse nang le li-diameter tse kholoanyane li ka hlahisoa ho tloha ho li-billet tse fokolang, 'me liphaephe tse cheselitsoeng tse nang le bophara bo fapaneng li ka boela tsa hlahisoa ho tloha li-billet tsa bophara bo lekanang. Leha ho le joalo, ha ho bapisoa le liphaephe tsa seam tse otlolohileng tsa bolelele bo lekanang, bolelele ba weld bo eketseha ka 30 ~ 100%, 'me lebelo la tlhahiso le tlaase. Ka mor'a ho lemoha mefokolo, peipi e cheselitsoeng e khaoloa ho ea bolelele bo boletsoeng ka sakha e fofang 'me e theoleloa moleng oa tlhahiso ka flip frame. Lintlheng ka bobeli tsa phala ea tšepe li lokela ho ba sephara-chamfere le ho tšoauoa, ’me liphaephe tse felileng li lokela ho pakoa ka dingata tse mahlakore a tšeletseng pele li tloha fekthering.