Kana iwe ukabvunza mumwe munhu ari kunze kweindasitiri inorema kuti afananidze bhaudhi, ivo vangangofungidzira yakapfava yakarukwa tsvimbo. Ndiyo yekutanga kusanzwisisa. Muchokwadi, stud bhaudhi ndeye chaiyo yekumisikidza, chinhu chakakosha icho kutadza kunogona kureva zvinopfuura kudonha-kunogona kureva kudzima, kana zvakanyanya. Musiyano uri mumashandisirwo uye zvirevo. Ndakaona mapurojekiti achinonoka nekuti mumwe munhu akafukidzwa generic tambo dzakarukwa kune yekumanikidza chombo flange. Vanotaridzika zvakafanana, asi havachinjike. Iyo stud, ine inoenderera mberi tambo kana chaiyo yakarukwa migumo, yakagadzirirwa kunyange yekusungirira mutoro kugovera mune yakasungwa majoini musangano. Kuita kuti zvisadaro haisi sarudzo.

The Anatomy of A Reliable Stud

Zvinotanga nezvinhu, asi hazvigumiri ipapo. Kune akawanda petrochemical kana magetsi ekudyara maapplication, uri kutarisa ASTM A193 B7 kana B16 yepamusoro-tembiricha sevhisi. Asi kutsanangura "B7" hakuna kukwana. Dhiabhorosi ari mukupisa kupisa uye shinda. Chitubu chakakodzera hachina kungotendeuka; shinda dzinowanzopetwa mushure mekupisa kupisa. Iri basa-rinoomesa midzi yeshinda, zvakanyanya kuvandudza kuneta kuramba. Ndinoyeuka batch kubva kumutengesi - macert emidziyo aive akakwana, asi shinda dzakachekwa. Pasi pekutakura cyclic pamusangano wepombi, vakatanga kutadza patambo yekutanga yakabatanidzwa. Dambudziko nderei? Maitiro ekugadzira asina kunaka. Iwo machira acho aive akasimba, asi shinda ndidzo dzainge dzisina simba.

Ipapo ndipo panoperera. Cadmium plating ndiyo yaive chiyero chekare chekuramba kuora, asi mitemo yezvemamiriro ekunze iri kuibvisa. Chinonyanya kuzivikanwa ikozvino zinc-nickel kana inopisa-dip galvanizing, asi unofanira kuzvidavirira kune hydrogen embrittlement, kunyanya nemabhaudhi akasimba seB7. Vanoda kubheka mushure mekuputira kuti vadzinge hydrogen. Svetuka nhanho iyoyo, uye iwe unoisa bhomba renguva. Ndakaona mhedzisiro yekukundikana kwe embrittlement pane compressor-yakachena, brittle fracture isina deformation. Mhedzisiro yacho yakarondwa kumashure kune imwe chitoro chekubika chaisiya kubikwa. The takeaway? Kudzora kwemhando yako kunoda kuwedzera kune yako sub-contractors.

Hurefu uye chamfer zvine basa kupfuura zvaungafunga. Stud inofanira kubuda mukati me nzungu neshinda dzinenge 1.5 kusvika 2. Yakareba, uye inoparadza uye inogona kupindira; ipfupi, uye hauwane kubatanidzwa kwakazara. Iyo chamfer pamagumo haisi yekungoita nyore kutanga; inodzivirira tambo dzekutanga kubva mukukuvadzwa panguva yekubata nekuisa. Takambove nevashandi vesaiti vachinyunyuta nezve nzungu dzakachinjika. Zvakazoitika, zvitubu zvakaunzwa zvine magumo kubva pakubata kwakashata, uye chamfer yaive isina kukwana. Tsanangudzo diki yakakonzera misoro mikuru.

Gaskets, Mutoro, uye Kusimbisa Dhanzi

Stud bolt haishande yega. Chinangwa chayo chose ndechekumanikidza gasket zvakafanana kugadzira chisimbiso. Rudzi rwegasket — spiral ronda, ring joint, soft graphite—inoraira mabhaudhi anodiwa. Pasi-torque, uye gasket haingagari zvakanaka, zvichitungamira mukudonha. Kupfuura-torque, uye iwe unogona kupwanya spiral ronda gasket, kukuvadza iyo filler, kana zvakanyanya, overstress iyo stud pachayo. Chinangwa ndechekuita "yegoho point" yezvinhu zvegasket, kwete bhoti. Apa ndipo panouya torque-and-turn procedures kana hydraulic tensioning. Zvipanera zve torque zvakapfava kazhinji hazvikwani matudhi mahombe-dhayamita nekuda kwekusawirirana.

Ini ndinoda hydraulic tensioning yemajoini akakosha. Inotambanudza stud bhaudhi elastically, uye ipapo nzungu inodzika pasi. Iyi nzira inopa yakanyanya kurongeka uye yakafanana mutoro kune ese ma studs muflange. Iyo imwe nzira, yekukanganisa wrenches, iresiphi yekusaenzana kurodha. Ndakaona maflange aive "akasimba" asi akadonha mushure mekukwira bhasikoro nekuti mutoro wacho wanga usina kuenzana, zvichiita kuti flange inyunguke zvishoma. Kudzoreredza mushure mekutenderera kwekupisa itsika yakajairwa, asi kana yekutanga mutoro waive pese pese, kudzoreredza kunogona kusagadzirisa.

Mafuta haataurike asi anowanzo vhiringika. Iwe unofanirwa kushandisa lubricant inotsanangurwa mukuita-kazhinji inodziya-yepamusoro-yekudzivirira-kubatwa komboni senge nickel-based kana copper-based. Uye inofanira kushandiswa chete kune shinda uye nut inotakura pamusoro, kwete chidimbu chinenge chiri pasi pekunetseka. Coefficient of friction inoshanduka zvakanyanya ne lubricant. Kushandisa iyo isiriyo, kana kuishandisa zvisingaenderani, zvinoreva kukosha kwako kwakaverengerwa torque hakuna basa. Ini ndakayeresa torque wrenches chete kuti simba riparare nekuti vashandi vakashandisa chero girisi raive mungoro yavo yekushandisa.

Sourcing uye Chokwadi cheGlobal Market

Iwe unogona kuve neakakwana specs uye maitiro, asi kana iyo yekusimbisa pachayo iri subpar, wapedza. Musika wacho wakazara nechigadzirwa, uye mhando inosiyana zvakasiyana. Kutenga mutengo kune ngozi. Kune asiri-akakosha maapplication, pamwe zvakanaka. Asi kune yekunatsa kana pombi yepasi pegungwa, iwe unoda traceability: nhamba dzekupisa, zvigayo certs, yakazara kemikari uye mekinika mishumo. Apa ndipo panosimbiswa mabhesi ekugadzira. Dunhu rakaita seYongnian muHebei, China, semuenzaniso, inzvimbo yakakura kwazvo yekugadzira fastener. Iko kusangana kwehunyanzvi uye zvivakwa ikoko kunogona kuve nemukana chaiwo.

Tora mugadziri akavakirwa ipapo, senge Handan Zitai Fastener Kugadzira Co, Ltd.. Nzvimbo yavo mune yakakura chiyero chikamu chekugadzira base muChina haingori mutsara wekushambadzira. Kuve padhuze nenjanji huru uye migwagwa yemigwagwa zvinoreva kuti zvinhu zvembatya mukati uye zvakapedzwa zvinhu zvakabatanidzwa. Kune mutengi, izvo zvinogona kududzira kune mutengo kunyatsoshanda uye kuvimbika mukutengesa keni. Paunenge uchiodha matani mashoma Stud Bolts yepurojekiti, haudi kuti varambe vari pachiteshi. Saiti yavo, https://www.zitaifasteners.com, inoratidza yakajairika renji-kubva paB7 kusvika kune mamwe mamakisi ehunyanzvi. Chinokosha ndechekuti vane maitiro emhando yekuitsigira kune zvakakosha maapplication.

Ndakabata nevatengesi vakanaka uye vakaipa kubva kumatunhu akafanana. Iwo akanaka anonzwisisa mwero wepasi rose se ASME, ASTM, uye DIN. Vanoisa mari mumitsetse yavo yekugadzira, tambo, uye kupisa kupisa. Ivo vanopa yakazara certification package pasina kubvunzwa. Iwo akashata anogona kupa fake cert kana kusanganisa mabhechi. Chimwe chidzidzo chinorwadza chaive "ASTM A320 L7" odha yebasa rekudzikira. Iwo macerts aitaridzika zvakanaka, asi Charpy maitiro bvunzo pa -150 ° F akakundikana zvinoshamisa. The material was off-grade. Mutengesi akabva anyangarika. Zvino, tinoongorora. Isu tinokumbira maitiro ekudzora mapepa, kwete ekupedzisira macerts.

Kana Zvinhu Zvikaipa: Zvidzidzo Zvemumunda

Kutadza kuongorora ndiye mudzidzisi akanakisa. Nyaya inonyanyozivikanwa yemumunda ndeyekubvuta kana kurira, kunyanya nesimbi isina tsvina yakaita seB8 (304/316). Kana iri pasi pemutoro wakakwira, iyo inodzivirira oxide layer inogona kuparara, zvichiita kuti tambo dzitonhore-weld pamwechete. Ihwo hunotyisa kuparadzana. Kushandisa giredhi rakasiyana seB8M (316) kunogona kubatsira, asi kazhinji mhinduro yacho ndeyemhando yepamusoro-anti-galling compound. Ndinorangarira chitsinhanisa chekushisa sumbu chinotsiva icho chakatora mazuva matatu kureba nekuti imwe neimwe simbi isina tsvina nenzungu yakanga yapfumbuka. Mutengo wevashandi wakapfuura zvakanyanya mutengo weanti-kubata zviri nani.

Corrosion under tension ndomumwe muurayi akanyarara. A stud bhaudhi pasi pekugara kusimba kushushikana munzvimbo inoora inokonzeresa kushungurudza corrosion cracking (SCC). Kune nharaunda dzechloride, izvi zvinotonga kunze kweyero 304/316 isina tsvina yezvikamu zvakasimbiswa. Iwe ungangoda kukwidziridza kune alloy inopokana kana kushandisa coated carbon steel stud. Isu takanga tine chirimwa chemumhenderekedzo yegungwa uko B7 studs ine yakaonda zinc coating yakaora mukati megore. Mushonga wacho waive mukobvu, wakanyanya kusimba zvivhariso zvekuvharisa, zvakabatanidzwa nekazhinji nguva dzekuongorora.

Dzimwe nguva, kukundikana kuri mukugadzira. Chiyero stud bolt ingasava mhinduro. Munzvimbo dzinozunguzika zvakanyanya, senge pamacompressor kana mapombi, ungangoda chidhirowa chekuchengetedza waya kana torque nut. Kana kuti, kuti ugare uchiparadzana, chitubu chine pfudzi chine pfudzi chingava nani kudzivirira kusakara patambo dzeflange. Izvo ndezvekufananidza iyo yekusimbisa kune sevhisi, kwete kungodhonza imwe kubva kune generic katalog.

Iyo Takeaway: Ihurongwa, Kwete Chikamu

Saka, mushure mezvose izvi, zvinorevei? Inyaya yekuti stud bhoti haimbofa yakangori chinhu chekutengesa chaunoisa pabhiri rezvinhu. Icho chinhu chakagadzirwa mukati mehombe system-iyo yakasungwa majoini. Kuita kwayo kunoenderana nechinhu, maitiro ekugadzira, iyo inopindirana Hardware (nzungu, washers), maitiro ekuisa, uye nharaunda yekushanda. Kufuratira chimwe cheizvi ndiko kukumbira dambudziko.

Zano rangu nderekunyanya-kutsanangura pane zvinyorwa uye pasi-kutsanangura pane bofu trust. Kumbira mapepa. Nzwisisa maitiro. Uye kuvaka hukama nevatengesi vanoiwana, vangave vari munzira kana kune rimwe divi renyika, seavo vari mumapoka makuru ekugadzira. Nekuti kana iwe uchinge wakatarisa kune inodonha flange na2 AM, chinhu chekupedzisira chaunoda kubvunza kuvimbika kweiyo studs inoibata pamwe chete. Ndipo paunoona kukosha kwechokwadi kweiyo "nyore" tsvimbo yakarukwa.