Indlela yokukhetha izixhobo zokuwelda kwiivalvu?

I-Welding isetyenziselwa ubukhulu becala i-welding ye-surfacing ye-valve yokutywinwa kwendawo, ukulungiswa kwe-welding yeziphene zokuphosa kunye ne-welding efunwa yisakhiwo semveliso. Ukukhethwa kwezixhobo ze-welding kuhambelana neendlela zayo zenkqubo. Izinto ezisetyenziselwa i-electrode arc welding, i-plasma arc welding, i-arc welding ephantsi kwamanzi kunye ne-carbon dioxide gas shielded welding iyahluka. Eyona ndlela iqhelekileyo kwaye isetyenziswa ngokuqhelekileyo i-welding yizinto ezahlukeneyo ezisetyenziswa kwi-electrode arc welding. 01 Iimfuno zezixhobo zokuwelda ivalve Ivalve sisiqalelo soxinzelelo lombhobho. Umgangatho wezakhono kunye nenkqubo ye-welding ye-welder ichaphazela ngokuthe ngqo umlingiswa wemveliso kunye nemveliso yokhuseleko, ngoko ke kungxamisekileyo ukuba kufuneke ngokungqongqo i-welder. I-Welding yinkqubo ekhethekileyo kwishishini lokuvelisa i-valve, kwaye kufuneka kubekho iindlela ezikhethekileyo zenkqubo ekhethekileyo, kubandakanywa nolawulo kunye nokulawulwa kwabasebenzi, izixhobo, inkqubo kunye nezixhobo. Umshicileli uya kudlula ulwazi olusisiseko kunye novavanyo lolawulo lwangempela loviwo oluchanekileyo lwebhoyila kunye noxinzelelo lwesitya soxinzelelo, ubambe isatifikethi (isatifikethi), kwaye unokuzibandakanya ekusebenzeni kwe-welding ngaphakathi kwexesha lokuqinisekisa. 02 Iimfuno zokugcinwa kwee-electrode zevalvu 1) Nika ingqalelo kumswakama okwi-ambient ukukhusela intonga ye-welding ekubeni ifume. Umswakama ohambelana nomoya kufuneka ube ngaphantsi kwe-60% kunye nomgama othile ukusuka emhlabeni okanye eludongeni. 2) Ukwahlula imodeli yentonga ye-welding kwaye inkcazo ayiyi kudideka. 3) Ngexesha lokuthutha kunye nokupakisha, qaphela ukuba ungonakalisi i-coating, ngokukodwa i-electrode yensimbi engenasici, i-electrode engaphezulu kunye ne-electrode yensimbi. I-03 Ukulungiswa kwe-Welding ye-valve castings 1) Ukulungiswa kwe-welding kuvunyelwe ukufakwa kwe-valve ngokufakwa kwesanti, i-crack, umngxuma womoya, umngxuma wesihlabathi, i-looseness kunye nezinye iziphene, kodwa i-oil stain, i-rust, umswakama kunye neziphene kufuneka zisuswe ngaphambi kokulungiswa kwe-welding. Emva kokususa iziphene, gcoba i-luster yensimbi nge-sandpaper. Ubume bayo kufuneka bube bushelelezi, kunye nethambeka elithile kwaye akukho mida ebukhali. Ukuba kuyimfuneko, ulawulo olungonakalisi luya kwenziwa ngepowder okanye ukungena kwamanzi, kwaye ukulungiswa kwe-welding kunokwenziwa kuphela xa kungekho ziphene. I-2) Ukulungiswa kwe-welding akuvumelekanga ukuba kukho ukuqhekeka okunzulu, ukuvala okubandayo, i-honeycomb pores, iindawo ezinkulu ze-porosity kwi-pressure bearing steel castings, kwaye akukho ziphene ezinokuthi zisuswe okanye iindawo ezingenakulungiswa kwaye ziphuculwe emva kokulungiswa. ukuwelda. I-3) Inani lokulungiswa kwe-welding ngokuphindaphindiweyo emva kovavanyo lokuvuza loxinzelelo oluthwele i-shell casting shell aluyi kudlula kabini. 4) Ukuphosa kufuneka kuphuculwe kwaye kugudiswe emva kokulungiswa kwe-welding, kwaye akukho mkhondo ocacileyo wokulungisa i-welding uya kushiywa. 5) Iimfuno ze-NDT zokuphosa emva kokulungiswa kwe-welding ziya kuphunyezwa ngokuhambelana nemigangatho efanelekileyo. 04 Unyango lokunciphisa uxinzelelo lwevalvu emva kwe-welding 1) Kwiiweldments ezibalulekileyo, ezinje ngeweld yebhatyi yokugquma i-thermal, i-weld yesitulo sevalvu efakwe kumzimba wevalvu, indawo yokutywina engaphezulu efuna unyango lwe-welding, kunye nokulungiswa kwe-welding yoxinzelelo. i-castings edlula uluhlu oluchaziweyo, uxinzelelo lwe-welding luya kupheliswa emva kwe-welding. Ukuba akunakwenzeka ukungena kwisithando somlilo, indlela yokuphelisa uxinzelelo lwendawo nayo ingamkelwa. Inkqubo yokuphelisa uxinzelelo lwe-welding ingabhekisela kwi-welding stick manual. I-2) Uxinzelelo lwe-welding luya kupheliswa emva kwe-welding ukuba ubunzulu bokulungisa i-welding budlula i-20% yodonga lodonga okanye i-25mm okanye indawo inkulu kune-65C ㎡ kunye nokuvuza kovavanyo lwegobolondo. 05 Isiqinisekiso senkqubo ye-valve ye-welding Ukukhethwa okuchanekileyo kwentonga ye-welding kuphela ikhonkco elibalulekileyo kwinkqubo ekhethekileyo yokudibanisa. Kuphela kukhetho oluchanekileyo lwentonga ye-welding. Ngaphandle kwesiqinisekiso samanqaku angaphambili, akunakwenzeka ukufumana umgangatho olungileyo we-welding. Ekubeni umgangatho we-welding ye-arc welding ye-electrode yahlukile kwiiparameters ezibalulekileyo ezichazwe ngumgangatho we-electrode ngokwayo, ububanzi be-electrode, isiseko sesinyithi, ubukhulu besiseko sesinyithi, indawo ye-weld, ukushisa kwangaphambili kunye nokwamkelwa okwangoku, nikela ingqalelo kwiinguqu zezi zinto. iparameters ezibalulekileyo. Kwiimveliso zevalvu, inkqubo yokuwelda isiqinisekiso ibandakanya ukuvela komphezulu wokutywina, ukuwelda kwe-inlay yesitulo sevalvu kunye nomzimba wevalvu kunye nokulungiswa kwe-welding yeendawo zoxinzelelo. Ngeendlela ezithile zenkqubo yesiqinisekiso, nceda ujonge icandelo le-ASME IX ukuwelda kunye nomgangatho wesiqinisekiso sebrazing kunye nomgangatho woshishino loomatshini baseTshayina JB / T 6963 inkqubo yokudibanisa ukuwelda isiqinisekiso sokufaneleka kwezahlulo zentsimbi.