Kwimizi-mveliso yanamhlanje, iteknoloji ye-Resistance Spot Welding (RSW) ibe yinkqubo engundoqo yokujoyina amacandelo ensimbi engenasici kumacandelo afana neenqwelo, i-aerospace, kunye nezixhobo zasekhaya, ngenxa yokusebenza kwayo kunye nokuthembeka.
Nangona kunjalo, umgangatho we-spot weld ngokusisiseko uxhomekeke kubungakanani, imilo, kunye nemfezeko yangaphakathi ye-Weld Nugget eyenziwe ngexesha lenkqubo. I-weld nugget yeyona ndawo ibalulekileyo "ye-fusion zone" edibanisa iintsimbi ezimbini okanye ngaphezulu, kwaye umgangatho wayo umisela ngokuthe ngqo amandla okudibanisa kunye nokuthembeka kwesakhiwo.
Esi sikhokelo sijolise ekuboneleleni iinjineli kunye namagcisa ngendlela ecwangcisiweyo nesebenzayo yokuvavanya umgangatho wensimbi engenastainless weld nugget. Iquka isicwangciso-qhinga esibanzi ukusuka kwizalathi ezingundoqo kunye{1}}novavanyo olungonakalisiyo ukuya kwiparameter optimization, ukuqinisekisa ukuba iindawo ezidityanisiweyo zidibana neyona migangatho iphezulu yoshishino.
I. Iimpawu eziphambili kunye neMigangatho yoShishino kuMgangatho weWeld Nugget
Ukuvavanya umgangatho we-stainless steel spot weld nugget, imigangatho ecacileyo yokulinganisa kufuneka iqale isungulwe. Umgangatho weNugget udla ngokumiselwa zezi zalathisi zingundoqo zintathu zilandelayo:
1. Nugget Diameter
Idayamitha ye-nugget sesona salathisi sibalulekileyo sokuvavanya umthwalo{0}umthamo wokuthwala wejoyini. I-diameter enganeleyo ikhokelela ekunciphiseni amandla adibeneyo kunye nokungaphumeleli okunokwenzeka phantsi koxinzelelo.
| Isalathisi soVavanyo | Umgangatho woShishino Jikelele (iReferensi) | Isincomo Esisebenzayo |
| Ubuncinci be-Nugget Diameter | Ngokubanzi ifuna i-$D \\ge 4\\sqrt{t}$ ($t$ bubunzima beshiti elinye, ku-mm) | Kwishiti lentsimbi etyebileyo ye-1.0mm, ubuncinci be-nugget ubukhulu kufuneka bungabi ngaphantsi kwe-4.0mm. |
| Umgangatho weMetallographic | Umgangatho wocazululo lwe-metallographic: Kubungqingqwa be-3mm, i-nugget yedayamitha $\\ge 4\\text{mm}$. | Eli lixabiso lereferensi yolondolozo; imveliso yokwenyani kufuneka ibhekiselele kwimigangatho ethile esekwe kwimathiriyeli kunye nobukhulu beshiti. |
2. Ireyithi yokuNgena kweNugget
Umlinganiselo wokungena yipesenti yobunzima be-nugget ngokumalunga nobukhulu obupheleleyo bamaphepha adibeneyo.
- IiMfuno eziMgangatho: Umlinganiselo ofanelekileyo wokungena kufuneka ube phakathi kwe-20% kunye ne-80%.
- Ukungena okuphantsi (<20%): Small contact area between the nugget and the base metal, resulting in insufficient strength.
- High Penetration (>I-80%): Ithanda ukugxothwa (i-spatter), ukujoliswa komphezulu kakhulu, okanye nokutshisa{1}kudlula, kuchaphazela inkangeleko kunye nokusebenza kokudinwa.
3. Iziphene zangaphakathi
Iziphene ngaphakathi kwe-weld nugget yingozi efihliweyo engakhokelela ekuhlulekeni ngokubambisana. Oku kuqala kubandakanya:
- I-Porosity: I-Voids eyenziwa xa iigesi zingakhutshwa ngokwaneleyo ngexesha le-welding.
- Iintanda: Ikakhulu ibangelwa kuxinzelelo lwe-thermal ye-welding okanye amazinga okupholisa ngokukhawuleza.
- I-Shrinkage Voids: Imingxuma eyenziweyo njengoko i-nugget etyhidiweyo iqina kwaye iyancipha.
- Umlinganiselo weNdawo eneSiphene: Imigangatho yoShishino idla ngokufuna ukuba indawo yesiphene iyonke ingagqithi kuma-20% ommandla we-nugget uwonke.
II. Alulo-uVavanyo oluLonakalisayo (NDT): Olululo kunye nolweNyaniso{2}}loVavanyo loMgangatho weXesha
Izindlela zokuvavanya ezingonakalisi -zivumela i-100% yokuhlolwa ngokukhawuleza kwe-weld nugget ngaphandle kokonakalisa indawo, ibenze ifaneleke ngokukodwa kulawulo lomgangatho we-intanethi kwimveliso ephezulu{2}}yevolumu.
1. Uvavanyo lweUltrasonic (UT)
I-UT yeyona ndlela ixhaphakileyo ye-NDT ye-spot welds. Isebenzisa ukubonakaliswa kwamaza e-ultrasonic kwiinkalo ezahlukeneyo zezinto eziphathekayo (ezifana nomgca wokudibanisa phakathi kwe-nugget kunye nesiseko sesinyithi, okanye iziphene) ukuvavanya ubungakanani be-nugget kunye nokunyaniseka.
| Inkalo yobuGcisa | Inkcazo eneenkcukacha kunye neReferensi eSebenzayo |
| Umgaqo | Isebenzisa imiqondiso ethile ye-echo eyenziwe ngamaza e-ultrasonic kwindawo yeempawu zerhomboid (umgca we-fusion) phakathi kwe-weld nugget kunye nesiseko sesinyithi. |
| Ixesha leFlight (TOF) Uhlalutyo | Ngokuhlalutya i-Time of Flight (TOF) uphawu lwe-ultrasonic wave, ubukhulu be-nugget kunye nobubanzi bunokuqikelelwa ngokuchanekileyo. |
| Data Reference | Ngokomzekelo, kwizinto ezithile kunye ne-frequency, i-TOF ye-0.38μs inokuhambelana nobubanzi be-nugget malunga ne-4mm. Ekusetyenzisweni okusebenzayo, ilayibrari yesampula eqhelekileyo kufuneka isekwe ukulungiselela ulungelelwaniso. |
| Iingenelo | Isantya esiphezulu, esivumela-ukuhlola umgca; uvakalelo kwidayamitha ye-nugget kunye neziphene zomgca wokudibanisa. |
2. Uvavanyo lweRadiographic (RT)
I-RT isebenzisa i-X-reyi ukugqobhoza i-weldment. Ngokusebenzisa ulwahlulo lokufunxa kwe-X-reyi kwiindawo ezinoxinano olwahluka-hlukeneyo, umfanekiso uyaveliswa, ukuvumela ukubonwa kweziphene zangaphakathi.
- Ukusebenziseka: Ngokukodwa okusebenzayo ekufumaneni iziphene zangaphakathi zevolumetric ezifana ne-porosity, ii-cracks, kunye ne-shrinkage voids.
- Izinto eziluncedo: Ibonelela ngerekhodi esemgangathweni esisigxina kwaye inikezela ngemifanekiso enembileyo yohlalutyo lwesiphene somgangatho.
- Unyino: Iindleko eziphezulu kunye nezingachanekanga kangako kumlinganiselo wobungakanani bomthamo we-nugget xa kuthelekiswa ne-UT.
III. UVavanyo olonakalisayo: Ukuqinisekisa amandla adibeneyo kunye neMicrostructure
Uvavanyo olutshabalalisayo yeyona ndlela yokuqinisekisa umgangatho we-weld nugget kunye nokusebenza koomatshini bokudibanisa. Ngokuqhelekileyo isetyenziselwa ukuqinisekiswa kwamaxesha athile kwiiparamitha zenkqubo kunye nophuhliso lwemveliso entsha.
1. Uvavanyo loomatshini
Iimvavanyo zoomatshini zivavanya ngokuthe ngqo umthwalo-umthamo wokuthwala kunye nokuthembeka kwe-weld nugget.
| Uhlobo loVavanyo | Injongo yoVavanyo | Iinqobo zokwamnkela (isitshixo) |
| Uvavanyo lwePeel | Ivavanya amandla obuso kunye nobubanzi be-weld nugget. | Isiphumo esifanelekileyo: Ukukrazula kwenzeka kwisiseko sesinyithi (izinto zomzali), hayi kwi-weld nugget interface. Ukuba i-nugget ikhupha kwi-interface (ukusilela kwe-interfacial), ithathwa njengengamkelekanga. |
| Uvavanyo lwe-Tensile Shear | Iqinisekisa owona mthwalo uphezulu-umthamo wokuthwala wejoyini. | Amandla okucheba alinganisiweyo kufuneka ahlangabezane okanye adlule iimfuno zoyilo, kwaye imowudi yokusilela kufuneka ibe yisiseko sokukrazula kwesinyithi. |
2. Uhlalutyo lwe-Metallographic
Uhlalutyo lwe-metallographic yeyona ndlela ichanekileyo yokuvavanya ubume be-weld nugget's microstructure kunye nemilinganiselo, isebenza njengesiseko sokuseka kunye nokuqinisekisa iiparamitha zenkqubo ye-welding.
Inkqubo:
- Sika isampuli ukusuka kwindawo ye-weld.
- Khupha, ugaye, kwaye upolishe isampuli.
- Yenza i-chemical etching usebenzisa i-etchant efana ne-2% ye-Nital (i-nitric acid kwi-alcohol) ukubonisa ngokucacileyo i-microstructure kunye nomgca wokudibanisa phakathi kwe-nugget kunye nesiseko sesinyithi.
Iinqobo zoMgangatho:
- Umlinganiselo we-Dimensional Measurement: Umlinganiselo ochanekileyo we-nugget ye-diameter kunye nesantya sokungena, esisebenza njengesiseko sokulungiswa kwepharamitha yenkqubo.
- Ulwakhiwo lweMicrostructure: Ukuhlolwa kweenkozo ezirhabaxa, iintanda, okanye iindawo ezingaxutywanga phakathi kwendawo ye-nugget.
IV. iSpot Welding Parameter Optionation Strategy: Ukuphumelela okuZinzile,-IiNuggets zoMgangatho
Ukuzinza komgangatho we-weld nugget kuxhomekeke kulawulo oluchanekileyo lweeparamitha ezingundoqo ezintathu: okwangoku, ixesha kunye namandla.
1. Ulawulo lwangoku kunye nexesha (i-Welding yangoku kunye nexesha)
Ngoku ngumthombo wobushushu owenza i-nugget etyhidiweyo, kwaye ixesha limisela ukuqokelelwa kobushushu.
- Ubukhulu bangoku: Uluhlu olucetyiswayo olulolona luqhelekileyo luphakathi kwe-7.5 kA kunye ne-8.5 kA (kubunzima obuqhelekileyo bentsimbi engapheliyo). Okwangoku ephantsi kakhulu ayiyi kwenza i-nugget enkulu ngokwaneleyo; yangoku ephezulu kakhulu ithanda ukugxothwa kunye nokutshisa.
- Ubude bexesha le-Welding: Uluhlu olucetyiswayo luyi-400 milliseconds ukuya kwi-500 milliseconds. Oku kufuna ukulinganisa isantya se-nucleation kunye nokuthintela ukufudumala. Kumashiti ashinyeneyo, -indlela yokunyuka kwe-pulse okanye eyonyusiweyo yangoku inokuba yimfuneko ukufezekisa ukukhula okufanayo kwe-nugget.
2. Ulungelelwaniso loMbane (i-Electrode Force/Pressure)
Injongo yamandla e-electrode (uxinzelelo) kukuqinisekisa ukudibana kombane okulungileyo phakathi kwe-electrode kunye ne-workpieces, kunye naphakathi kwezinto zokusebenza ngokwazo, ngelixa ukhusela ukuxoshwa ngexesha le-welding.
- I-Thin Materials (umzekelo, ngaphantsi kwe-0.5mm): Uxinzelelo oluphantsi loqhagamshelwano luyacetyiswa, olunje malunga ne-0.3 MPa, ukunqanda ukujula ngokugqithisileyo.
- Amacandelo atyebileyo (umzekelo, ngaphezu kwe-1.0mm): Uxinzelelo oluphezulu luyafuneka, olufana ne-0.5 MPa okanye ngaphezulu, ukuqinisekisa ukudibanisa okwaneleyo kobuso kunye nokusabalalisa okuzinzile kwangoku.
- Ingcebiso eSebenzayo: Uxinzelelo olunganeleyo lukhokelela ekuchaselweni koqhagamshelwano oluphezulu kunye nokuxoshwa; Uxinzelelo olugqithisileyo lunyusa i-shunting kwaye lukhawulezisa ukunxiba kwe-electrode.
V. Ulawulo lwe-Electrode kunye nokuPhunyezwa koQinisekiso loMgangatho
I-electrode "yintliziyo" yomatshini wokuwelda indawo. Imeko yayo ichaphazela ngokuthe ngqo ukuxinana kwangoku kunye nokusabalalisa ubushushu, okwenza ukuba kubaluleke kakhulu ekuqinisekiseni umgangatho we-weld nugget.
1. Izinto ze-Electrode kunye noLondolozo
| Umba | Iingcebiso eziSebenzayo kunye neeNkqubo |
| Ukukhethwa kwezinto | Usetyenziso olucetyiswayo lweCopper{0}}i-electrode ezihlanganisiweyo zeTungsten okanye iChromium Zirconium Copper (CuCrZr) electrode. I-matrix yobhedu iqinisekisa ukusebenza okuphezulu, ngelixa i-tungsten alloy okanye i-CuCrZr iphucula{2}}ukuxhathisa ubushushu kunye nokumelana nokunxiba. |
| Iinkqubo zoLondolozo | Ukucocwa komphezulu rhoqo ukususa ukungcola kunye neeoksidi. Ubuso be-electrode kufuneka bugcinwe bugudileyo. |
| Ukutshintshwa kweThreshold | Xa ububanzi bobuso be-electrode bunxiba okanye bukhubaza ngaphezu kwe-20% yobukhulu bokuqala, kufuneka bunxitywe okanye butshintshwe ukuze kuthintelwe ukuhla koxinano lwangoku kunye nobungakanani be-nugget obungazinzanga. |
| Inkqubo yokupholisa | Qinisekisa ukuba inkqubo yokupholisa i-electrode isebenza ngokuchanekileyo. Ukulawulwa kobushushu bamanzi okungena okucetyiswayo kuphakathi kwe-5 kunye ne-30℃ukuthintela ukugqithiswa kwe-electrode kunye ne-thermal deformation. |
2. Inkqubo yoQinisekiso loMgangatho (QA).
Ukuseka inkqubo ye-QA ebanzi ibalulekile ekuqinisekiseni imveliso ezinzileyo:
- I-Parameter Benchmarking: Misela iitheyibhile ezisemgangathweni ze-welding ye-welding yonke indibaniselwano yemathiriyeli yensimbi engenasici (umz., 304/316L, ubukhulu obahlukeneyo).
- Ulawulo lweNkqubo yeNkxaso-manani (SPC): Sebenzisa iindlela ze-SPC ukujonga nokuhlalutya iintsingiselo zangoku, amandla ombane, kunye namandla ngexesha lokwenyani, ukuvumela ukubhaqwa kwangexesha kunye nokulungiswa kokutenxa kwenkqubo encinci.
- Ulungelelwaniso lwezixhobo: Ukulinganisa ngokuchanekileyo izixhobo zokubeka iliso ezifana ne-ammeters kunye neenzwa zoxinzelelo rhoqo ukuqinisekisa ukuchaneka kwedatha.
- UQeqesho lwaBasebenzi: Ukuqeqesha rhoqo abaqhubi ukuba babe nezakhono zokuchonga iziphene kunye nolwazi lohlengahlengiso lweparameter.
Ukuqukumbela
Kwizicelo ze-weld spot welding, ukuvavanya umgangatho we-weld nugget yinkqubo yobunjineli ecwangcisiweyo ebandakanya ukusetwa okusemgangathweni, uhlolo oluchanekileyo, kunye nolawulo lwenkqubo. Ngokusebenzisa iindlela ezisebenzayo ezingonakalisi -ezifana noVavanyo lwe-Ultrasonic kwimveliso ye{2}} edityaniswe noHlahlelo lwe-Metallographic kunye noVavanyo lweMechanical ukuqinisekiswa kwamaxesha athile, kunye nokubambelela ngokungqongqo kwi-parameter optimization kunye neprothokholi yolawulo lwe-electrode, abavelisi banokuseka isikhokelo solawulo oluluqilima.
Kuphela ngokufumana ulawulo oluchanekileyo phezu kobukhulu be-weld nugget, izinga lokungena, kunye neziphene zangaphakathi apho amakhonkco ensimbi engenasici anokuthi aqinisekiswe ukuba anamandla awongamileyo kunye nolwakhiwo lwemfezeko oluhlala luhleli, ngaloo ndlela kuhlangatyezwana nezona mfuno zingqongqo zesicelo semizi-mveliso.
