Ukwazi iziseko malunga nee-electrodes ze-E7018 ezinamathelayo eziphantsi kwe-hydrogen kunokuba luncedo ekuqondeni indlela yokwandisa ukusebenza kwazo, ukusebenza kwazo kunye nee-welds ezinokuzivelisa.
Ukuwelda okunamathelayo kuhlala kubalulekile kwimisebenzi emininzi yokuwelda, ngokuyinxenye kuba izixhobo ezisetyenziswa kwiindawo ezininzi ziyaqhubeka nokusebenza, kwaye yindlela abaqhubi abaninzi bokuwelda abayaziyo kakuhle. Xa kufikwa ekuwelda okunamathelayo, i-American Welding Society (AWS; Miami, FL) E7018 stick electrodes ziyindlela eqhelekileyo kuba zibonelela ngeempawu ezifanelekileyo zoomatshini kunye neekhemikhali kwiintlobo ngeentlobo zezicelo, kunye namanqanaba aphantsi e-hydrogen ukunceda ukuthintela ukuqhekeka okubangelwa yi-hydrogen.
Ukwazi iziseko malunga nee-electrode ze-E7018 ezinamathelayo eziphantsi kwe-hydrogen kunokuba luncedo ekuqondeni ukusebenza kwazo, ukusebenza kwazo, kunye nee-welds eziphuma kuzo. Njengomthetho jikelele, ii-electrode ze-E7018 ezinamathelayo zibonelela ngamanqanaba aphantsi okuchitha kunye ne-arc egudileyo, ezinzileyo, nethuleyo. Ezi mpawu zentsimbi yokuzalisa zinika umqhubi we-welding ulawulo oluhle phezu kwe-arc kwaye zinciphisa isidingo sokucocwa emva kwe-weld - zombini ezi zinto zibalulekileyo kwizicelo ezifuna ingqalelo enonophelo kumgangatho we-weld kunye nokufakwa kobushushu, kunye nezo zikwixesha elibekiweyo.
Ezi electrode zibonelela ngamazinga amahle okufaka kunye nokungena kakuhle, oko kuthetha ukuba abaqhubi be-welding banokongeza isinyithi esininzi kwi-joint ngexesha elithile kunezinye ii-electrode ezininzi ezinamathelayo (ezifana ne-E6010 okanye i-E6011), kwaye basenokuziphepha iziphene ze-weld ezifana nokungabikho kwe-fusion. Ukongezwa kwezinto ezifana nomgubo wentsimbi, i-manganese, kunye ne-silicon kwezi electrode kubonelela ngeenzuzo ezahlukeneyo, kubandakanya (kodwa kungaphelelanga apho) ukukwazi ukuwelda ngempumelelo kumhlaba othile wokungcola, ukungcola, okanye isikali se-mill.
Ukuqala nokuqalisa kwakhona kwe-arc elungileyo, okunceda ukuphelisa iingxaki ezifana ne-porosity ekuqaleni kwe-weld, yinzuzo eyongezelelweyo ye-E7018 stick electrodes. Ukuze ubuyisele kwakhona i-arc kakuhle (ukuqalisa kwakhona i-arc), kuyimfuneko kuqala ukususa idiphozithi ye-silicon eyenzeka ekupheleni kwe-electrode. Nangona kunjalo, kubalulekile ukuqinisekisa zonke iimfuno ngaphambi kokuwelda, kuba ezinye iikhowudi okanye iinkqubo azivumeli ukumiswa kwe-stick electrodes.
Njengoko kuphawuliwe kuhlelo lwabo lwe-AWS, ii-electrode ze-stick ze-E7018 zibonelela ngobuncinci amandla okutsalwa kwe-psi angama-70,000 (achazwe ngu-“70”) kwaye zingasetyenziswa kuzo zonke iindawo zokuwelda (achazwe ngu-“1”). I-“8” ibhekisa kwi-hydrogen coating ephantsi, kunye nokungena okuphakathi okunikezelwa yi-electrode kunye neentlobo zangoku ezifunekayo ukuze isebenze. Kunye nohlelo oluqhelekileyo lwe-AWS, ii-electrode ze-stick ze-E7018 zinokuba nee-designators ezongezelelweyo ezifana ne-“H4” kunye ne-“H8” ezibhekisa kubungakanani be-hydrogen esasazekayo kwi-filler metal deposits kwi-weld. Umzekelo, uphawu lwe-H4 lubonisa ukuba i-weld deposit ine-4 ml okanye ngaphantsi ye-hydrogen esasazekayo kwi-100 g ye-weld metal.
Ii-electrode ezine-“R” designator — ezifana ne-E7018 H4R — ziye zavavanywa ngendlela ethile kwaye zibonwe njengezingamelani nokufuma ngumvelisi. Ukuze ufumane olu phawu, imveliso kufuneka imelane nokufuma ngaphakathi koluhlu oluthile emva kokuba ivezwe kubushushu obungama-80 deg F kunye nama-80 ekhulwini okufuma kangangeeyure ezisithoba.
Okokugqibela, ukusetyenziswa kwe-“-1” kudidi lwe-stick electrode (umz. E7018-1) kuthetha ukuba imveliso inika ukuqina okuphuculweyo kwempembelelo ukunceda ukumelana nokuqhekeka kwizicelo ezibalulekileyo okanye kumaqondo obushushu aphantsi.
Ii-electrode ze-E7018 ezinamathela kwi-hydrogen stick zingasebenza ngomthombo wamandla oqhubekayo (CC) onika i-alternating current (AC) okanye i-direct current electrode positive (DCEP). Iintsimbi ze-filler ze-E7018 zine-arc stabilizers ezongezelelweyo kunye/okanye i-iron powder kwi-coating ukunceda ukugcina i-arc ezinzileyo xa kudityaniswa i-AC current. Inzuzo ephambili yokusebenzisa i-AC kunye nee-electrodes ze-E7018 kukususa i-arc blow, enokwenzeka xa kudityaniswa i-DC kusetyenziswa i-grounding engafanelekanga okanye xa kudityaniswa iindawo ezinemagnethi. Nangona kukho ezinye ii-arc stabilizers, ii-welds ezenziwe nge-AC zisenokungabi bushelelezi njengalezo zenziwe nge-DC, nangona kunjalo, ngenxa yotshintsho oluqhubekayo kwicala langoku oluvela ukuya kuthi ga kwi-120 amaxesha ngomzuzwana.
Xa kudityaniswa nge-DCEP current, ezi electrodes zinokubonelela ngolawulo olulula lwe-arc kunye ne-weld bead ekhangayo ngakumbi, kuba indlela yokuhamba komsinga iyafana. Ukuze ufumane iziphumo ezilungileyo, landela iingcebiso zomenzi malunga neeparameter zokusebenza kobubanzi be-electrode.
Njengayo nayiphi na inkqubo kunye ne-electrode, ubuchule obufanelekileyo xa udibanisa ii-stick welding ngee-stick electrodes ze-E7018 bubalulekile ukuqinisekisa umgangatho olungileyo we-weld. Bamba ubude be-arc obuqinileyo - kungcono ugcine i-electrode ingaphezulu nje kwedama le-weld - ukugcina i-arc izinzile kwaye unciphise amathuba okuba nee-porosity.
Xa udibanisa kwindawo ethe tyaba nethe tyaba, khomba/rhuqa i-electrode ukusuka kwi-5 deg ukuya kwi-15 deg ukusuka kwicala lokuhamba ukuze uncede ekunciphiseni amathuba okubamba i-slag kwi-weld. Xa udibanisa kwindawo ethe tye, khomba/tyhala i-electrode phezulu ukusuka kwi-3 deg ukuya kwi-5 deg ngelixa uhamba uye phezulu, kwaye usebenzise indlela yokuluka kancinci ukunceda ukuthintela i-weld ukuba ingatyibiliki. Ububanzi be-weld bead bufanele bube buphindwe kabini ngesiqingatha kunobubanzi bocingo oluphambili lwe-electrode kwii-welds ezithe tyaba nezithe tye, kwaye buphindwe kabini ngesiqingatha ukuya kathathu ububanzi obuphambili kwii-welds ezithe tye.
Ii-electrode ze-E7018 ezinamathelayo zihlala zithunyelwa zivela kumenzi kwiphakheji evalwe kakuhle ukuze zikhuseleke ekonakaleni kokufuma nasekuthathweni. Kubalulekile ukugcina loo phakheji injalo kwaye igcinwe kwindawo ecocekileyo neyomileyo de iimveliso zilungele ukusetyenziswa. Nje ukuba zivulwe, ii-electrode ezinamathelayo kufuneka ziphathwe ngeeglavu ezicocekileyo nezomileyo ukuthintela ukungcola kunye nenkunkuma ukuba inganamatheli kwingubo kwaye kuthintelwe ithuba lokuthatha umswakama. Ii-electrode nazo kufuneka zigcinwe kwi-oven kumaqondo obushushu acetyiswayo ngumenzi emva kokuba zivulwe.
Ezinye iikhowudi zichaza ukuba ii-electrode ezinamathelayo zingaba kude kangakanani ngaphandle kwepakethe evaliweyo okanye kwi-oven yokugcina izinto, kwaye ukuba isinyithi esizalisayo sinokulungiswa kangaphi (oko kukuthi, ngokubhaka okukhethekileyo ukususa umswakama ofunxiweyo) ngaphambi kokuba zilahlwe. Soloko ujonga iinkcukacha ezifanelekileyo kunye neekhowudi malunga neemfuno zomsebenzi ngamnye.
Ixesha lokuthumela: Disemba-23-2022