Ekwenziweni kwezimboni zanamuhla,I-Resistance Spot Welding(RSW) ubuchwepheshe sebuphenduke inqubo ewumgogodla yokujoyina izingxenye zensimbi engagqwali emikhakheni efana nezimoto, i-aerospace, nezinto zikagesi zasekhaya, ngenxa yokusebenza kahle nokuthembeka kwayo.
Kodwa-ke, ikhwalithi ye-spot weld incike ngokuyisisekelo kusayizi, ukwakheka, nobuqotho bangaphakathi be-Weld Nugget eyakhiwe phakathi nenqubo. I-weld nugget "indawo ehlanganisiwe" ebalulekile exhuma amashidi ensimbi amabili noma ngaphezulu, futhi ikhwalithi yawo inquma ngokuqondile amandla amalunga nokuthembeka kwesakhiwo.
Lo mhlahlandlela uhlose ukuhlinzeka onjiniyela nochwepheshe ngendlela ehlelekile nesebenzayo yokuhlola ikhwalithi ye-stainless steel spot weld nugget. Ihlanganisa isu elibanzi kusukela kuzinkomba ezibalulekile kanye{1}}nokuhlola okungabhubhisi kuya ekuthuthukisweni kwepharamitha, ukuqinisekisa ukuthi amajoyinti ashiselwe ahlangabezana namazinga aphezulu kakhulu embonini.
I. Izinkomba Ezibalulekile Namazinga Omkhakha Wekhwalithi Ye-Weld Nugget
Ukuze uhlole ikhwalithi ye-stainless steel spot weld nugget, izindinganiso ezicacile zokulinganisa kufanele ziqale zisungulwe. Ikhwalithi ye-Nugget ivamise ukunqunywa yizinkomba ezintathu ezibalulekile ezilandelayo:
1. Ububanzi be-Nugget ($D$)
Ububanzi be-nugget buyinkomba ebaluleke kakhulu yokuhlola-umthamo wokuthwala wejoyinti. Ububanzi obunganele buholela ekunciphiseni amandla ahlangene kanye nokwehluleka okungenzeka ngaphansi kwengcindezi.
| Inkomba Yokuhlola | I-General Industry Standard (Inkomba) | Isincomo Esisebenzayo |
| Ubuncane be-Nugget Diameter | Ngokuvamile idinga u-$D \\ge 4\\sqrt{t}$ ($t$ uwugqinsi lweshidi elilodwa, ngo-mm) | Eshidini lensimbi engagqwali elingu-1.0mm, ubuncane be-nugget ububanzi kufanele bungabi ngaphansi kuka-4.0mm. |
| I-Metallographic Standard | Izinga lekhwalithi yokuhlaziywa kwe-metallographic: Ngobukhulu obungu-3mm, ububanzi be-nugget $\\ge 4\\text{mm}$. | Leli inani lereferensi elilandelanayo; ukukhiqizwa kwangempela kufanele kubhekisele kumazinga athile asuselwe kubukhulu bempahla nobukhulu beshidi. |
2. Izinga Lokungena Kwe-Nugget
Izinga lokungena liyiphesenti lokujiya kwe-nugget elihlobene nogqinsi oluphelele lwamashidi ashiselwe.
- Isidingo Esijwayelekile: Izinga lokungena elifanele kufanele libe phakathi kuka-20% no-80%.
- Ukungena Okuphansi (<20%): Small contact area between the nugget and the base metal, resulting in insufficient strength.
- High Penetration (>80%): Ijwayele ukuxoshwa (i-spatter), ukuhlehlisa phezulu kakhulu, noma ngisho nokusha{1}, kuphazamise ukubukeka nokusebenza kokukhathala.
3. Amaphutha Angaphakathi
Amaphutha ngaphakathi kwe-weld nugget izingozi ezifihliwe ezingaholela ekuhlulekeni kwamalunga. Lokhu kufaka phakathi:
- I-Porosity: Izikhala ezakhayo lapho amagesi angakhishwa ngokwanele ngesikhathi sokushisela.
- Imifantu: Ikakhulukazi ibangelwa ukushisela ingcindezi yokushisa noma amazinga okupholisa ashesha kakhulu.
- I-Shrinkage Voids: Imigodi eyakhiwe njengoba i-nugget encibilikisiwe iqina futhi incipha.
- I-Defect Area Limit: Amazinga emboni ngokuvamile adinga indawo ephelele enesici ukuthi ingeqi ku-20% wengqikithi yendawo ye-nugget.
II. Ukuhlola-Okungenakonakali (NDT): Ukuhlola Okusebenzayo Nengokoqobo-Isikhathi Sekhwalithi
Izindlela zokuhlola-ezingonakalisi zivumela ukuhlolwa okusheshayo okungu-100% kwe-weld nugget ngaphandle kokulimaza ingxenye, okuyenza ifanelekele ukulawulwa kwekhwalithi ye-inthanethi ekukhiqizeni{2}}ivolumu ephezulu.
1. Ukuhlolwa kwe-Ultrasonic (UT)
I-UT iyindlela evame kakhulu ye-NDT yokushisela amabala. Isebenzisa ukubonakaliswa kwamagagasi e-ultrasonic ezindaweni ezihlukene ezibonakalayo (njengomugqa wokuhlanganisa phakathi kwe-nugget nesisekelo sensimbi, noma amaphutha) ukuze kuhlolwe usayizi we-nugget nobuqotho.
| Isici Sobuchwepheshe | Incazelo Eningiliziwe kanye Nesethenjwa Esiwusizo |
| Isimiso | Isebenzisa amasiginali athile e-echo akhiqizwa amagagasi e-ultrasonic endaweni yesici se-rhomboid (umugqa wokuhlanganisa) phakathi kwe-weld nugget nesisekelo sensimbi. |
| Ukuhlaziywa Kwesikhathi Sendiza (TOF). | Ngokuhlaziya isignali ye-Time of Flight (TOF) yegagasi le-ultrasonic, ukujiya kwe-nugget nobubanzi kungalinganiswa ngokunembile. |
| Data Reference | Isibonelo, endaweni ethile nemvamisa, i-TOF ka-0.38μs ingase ihambisane nobubanzi be-nugget obucishe bube ngu-4mm. Ekusetshenzisweni okungokoqobo, umtapo wolwazi wesampula ojwayelekile kufanele usungulwe ukuze ulinganiswe. |
| Izinzuzo | Isivinini esiphezulu, esivumela-ukuhlola umugqa; iyazwela kububanzi be-nugget kanye namaphutha omugqa wokuhlanganisa. |
2. Ukuhlolwa kwe-Radiographic (RT)
I-RT isebenzisa -imisebe ukuze ingene endaweni yokushisela. Ngokusebenzisa ukumuncwa okuhlukile kwe-X-kwemisebe ezindaweni zokuminyana okuhlukahlukene, isithombe siyakhiqizwa, okuvumela ukubonakala kwezinkinga zangaphakathi.
- Ukusebenziseka: Isebenza kahle kakhulu ekutholeni iziphambeko zevolumu zangaphakathi ezifana ne-porosity, imifantu, nama-shrinkage voids.
- Izinzuzo: Ihlinzeka ngerekhodi lekhwalithi ehlala njalo futhi inikeza izithombe ezinembile zokuhlaziya ukukhubazeka kwekhwalithi.
- Imikhawulo: Izindleko eziphakeme nezinemba kancane esilinganisweni sobuningi bobubanzi be-nugget uma kuqhathaniswa ne-UT.
III. Ukuhlola Okulimazayo: Ukuqinisekisa Amandla Ahlangene kanye ne-Microstructure
Ukuhlola okulimazayo kuyindlela yokugcina yokuqinisekisa ikhwalithi ye-weld nugget kanye nokusebenza kokusebenza kwelunga. Ngokuvamile isetshenziselwa ukuqinisekiswa ngezikhathi ezithile kwamapharamitha wenqubo nokuthuthukiswa komkhiqizo omusha.
1. Ukuhlolwa Kwemishini
Ukuhlolwa kwemishini kuhlola ngokuqondile-umthamo wokuthwala nobuqotho be-weld nugget.
| Uhlobo Lokuhlola | Ukuhlola Inhloso | Imibandela Yokwamukela (Ukhiye) |
| Ukuhlolwa Kwekhasi | Ihlola amandla okusebenzelana kobuso nobubanzi be-weld nugget. | Umphumela Omuhle: Ukuklebhuka kwenzeka kusisekelo sensimbi (impahla engumzali), hhayi kusixhumi esibonakalayo se-weld nugget. Uma i-nugget iphuma kusixhumi esibonakalayo (ukwehluleka kobuso obuhlangene), kuthathwa njengokungamukeleki. |
| I-Tensile Shear Test | Iqinisekisa ubukhulu bomthwalo-umthamo wokuthwala wejoyinti. | Amandla okugunda okukaliwe kufanele ahlangabezane noma adlule izimfuneko zokuklama, futhi imodi yokwehluleka kufanele ibe ukudabuka kwensimbi okuyisisekelo. |
2. Ukuhlaziywa kwe-Metallographic
Ukuhlaziywa kwe-metallographic kuyindlela enembe kakhulu yokuhlola ukwakheka nobukhulu be-weld nugget, esebenza njengesisekelo sokusungula nokuqinisekisa imingcele yenqubo yokushisela.
Inqubo:
- Sika isampula endaweni yokushisela.
- Faka, ugaye bese upholisha isampula.
- Yenza ukufakwa kwamakhemikhali usebenzisa i-etchant efana no-2% we-Nital (i-nitric acid etshwaleni) ukuze uveze ngokucacile i-microstructure kanye nomugqa wokuhlanganisa phakathi kwe-nugget nesisekelo sensimbi.
Umbandela Wekhwalithi:
- Isilinganiso Sobukhulu: Isilinganiso esinembile sobubanzi be-nugget nezinga lokungena, esisebenza njengesisekelo sokulungiswa kwepharamitha yenqubo.
- I-Microstructure: Ukuhlolwa kokusanhlamvu okumahhadla, imifantu, noma izindawo ezingaxutshiwe phakathi kwendawo ye-nugget.
IV. Isu Lokuthuthukisa Ipharamitha Ye-Spot Welding: Ukuzuza Okuzinzile,{1}}Ama-nuggets Ekhwalithi ephezulu
Ukuzinza kwekhwalithi ye-weld nugget kuncike ekulawuleni okunembile kwamapharamitha amathathu abalulekile: okwamanje, isikhathi, namandla.
1. Ukulawula Kwamanje Nesikhathi (I-Welding Yamanje Nesikhathi)
Okwamanje umthombo wokushisa owenza i-nugget encibilikisiwe, futhi isikhathi sinquma ukunqwabelana kokushisa.
- Ukuqina Kwamanje: Ibanga elilungile elinconyiwe ngokuvamile liphakathi kuka-7.5 kA no-8.5 kA (ngobukhulu obujwayelekile bensimbi engagqwali). Okwamanje okuphansi kakhulu ngeke kwakhe i-nugget enkulu ngokwanele; yamanje ephakeme kakhulu ijwayele ukuxoshwa kanye nokushisa ngokweqile.
- Ubude besikhathi sokushisela: Ububanzi obunconywayo bungama-millisecond angu-400 ukuya kwangu-500. Lokhu kudinga ukulinganisa isivinini se-nucleation nokuvimbela ukushisa ngokweqile. Kumashidi aminyene,-isu lokukhuphuka kwe-pulse noma ukweqiwa kwamanje kungase kudingeke ukuze kuzuzwe ukukhula okufanayo kwe-nugget.
2. Force Calibration (Electrode Force/Pressure)
Inhloso yamandla e-electrode (ingcindezi) iwukuqinisekisa ukuthintana okuhle kukagesi phakathi kwama-electrode nama-workpieces, naphakathi kwama-workpieces ngokwawo, ngenkathi kuvimbela ukuxoshwa ngesikhathi sokushisela.
- Izinto Ezibalulekile Ezincane (isb., ngaphansi kuka-0.5mm): Ukucindezela okuphansi kokuxhumana kuyanconywa, okufana nokungu-0.3 MPa, ukugwema ukuhlehlisa ngokweqile.
- Izingxenye Eziwugqinsi (isb., ngaphezu kuka-1.0mm): Kudingeka ingcindezi ephakeme, efana no-0.5 MPa noma ngaphezulu, ukuze kuqinisekiswe ukuthintana okwanele kobuso nokusabalalisa kwamanje okuzinzile.
- Iseluleko Esiwusizo: Ukucindezela okunganele kuholela ekuphikisweni kokuxhumana okuphezulu nokuxoshwa; ukucindezela ngokweqile kwandisa i-shunting futhi kusheshise ukugqoka kwama-electrode.
V. Ukuphathwa Kwe-Electrode kanye Nokuqaliswa Kokuqinisekisa Ikhwalithi
I-electrode "inhliziyo" yomshini wokushisela indawo. Isimo sayo sithinta ngokuqondile ukuminyana kwamanje nokusabalalisa ukushisa, okuyenza ibaluleke kakhulu ekuqinisekiseni ikhwalithi ye-weld nugget.
1. Izinto ze-Electrode Nokugcinwa
| Isici | Izincomo Ezisebenzayo Nezinqubo |
| Ukukhetha Okubalulekile | Ukusetshenziswa okunconyiwe kwama-electrode e-Copper-e-Tungsten composite noma ama-electrode e-Chromium Zirconium Copper (CuCrZr). I-matrix yethusi iqinisekisa ukusebenza okuphezulu, kuyilapho ingxubevange ye-tungsten noma i-CuCrZr ithuthukisa{2}}ukumelana nezinga lokushisa okuphezulu nokumelana nokuguga. |
| Izinqubo Zokulungisa | Ukuhlanza indawo okuvamile ukuze kukhishwe ukungcola nama-oxide. Ubuso be-electrode kufanele bugcinwe bushelelezi. |
| I-Replacement Threshold | Lapho ububanzi bobuso be-electrode buguga noma buwohloka ngaphezu kuka-20% wosayizi wangempela, kufanele bugqokiswe noma bushintshwe ukuze kuvinjelwe ukwehla kokuminyana kwamanje kanye nosayizi we-nugget ongazinzile. |
| Uhlelo Lokupholisa | Qinisekisa ukuthi uhlelo lokupholisa ama-electrode lusebenza ngendlela efanele. Ukulawula izinga lokushisa kwamanzi okungena okunconyiwe kuphakathi kuka-5℃no-30℃ukuvimbela ukushisisa ngokweqile kwe-electrode kanye nokuwohloka kokushisa. |
2. Uhlelo Lokuqinisekisa Ikhwalithi (QA).
Ukusungula uhlelo oluphelele lwe-QA kubalulekile ukuze kuqinisekiswe ukukhiqizwa okuzinzile:
- Ukulinganisa Ipharamitha: Sungula amathebula epharamitha yokushisela ajwayelekile kuyo yonke inhlanganisela yezinto zensimbi engagqwali (isb, 304/316L, ubukhulu obuhlukahlukene).
- Ukulawulwa Kwenqubo Yezibalo (SPC): Sebenzisa izindlela ze-SPC zokuqapha nokuhlaziya amathrendi kumanje, i-voltage, namandla ngesikhathi-sangempela, okuvumela ukutholwa ngesikhathi kanye nokulungiswa kokuchezuka okuncane kwezinqubo.
- Ukulinganiswa Kwezisetshenziswa: Linganisa ngokunembile okokusebenza kokuqapha okufana nama-ammeter nezinzwa zokucindezela njalo ukuze uqinisekise ukunemba kwedatha.
- Ukuqeqeshwa Kwabasebenzi: Ukuqeqesha ngokuqhubekayo opharetha ukuthi babe nekhono lokuhlonza iphutha kanye nolwazi lokulungiswa kwepharamitha.
Isiphetho
Ezinhlelweni zokushisela indawo yensimbi engagqwali, ukuhlola ikhwalithi ye-weld nugget yinqubo yobunjiniyela ehlelekile ehlanganisa ukusetha okujwayelekile, ukuhlola okunembile, nokulawulwa kwenqubo. Ngokusebenzisa izindlela eziphumelelayo-ezingonakalisi ezifana nokuhlola kwe-Ultrasonic{2}}kokukhiqizwa kolayini, okuhlanganiswe nokuhlaziywa kwe-Metallographic kanye nokuhlolwa kwe-Mechanical ukuze kuqinisekiswe ngezikhathi ezithile, kanye nokunamathela ngokuqinile ekuthuthukisweni kwepharamitha nokuphathwa kwamaphrothokholi ama-electrode, abakhiqizi bangasungula uhlaka oluqinile lokulawula ikhwalithi.
Kuphela ngokufinyelela ukulawula okunembile phezu kosayizi we-weld nugget, izinga lokungena, kanye nokukhubazeka kwangaphakathi lapho amajoyinti ensimbi engagqwali angaqinisekiswa ukuthi anamandla aphakeme nobuqotho obuhlala njalo besakhiwo, ngaleyo ndlela kuhlangatshezwana nezidingo eziqinile zokufaka isicelo sezimboni.
