Porosity, mhango-mhando discontinuities inoumbwa nekupinzwa kwegasi panguva yekusimba, yakajairika asi inorema kukanganisa muMIG welding uye imwe ine zvikonzero zvakati. Inogona kuoneka mune semi-otomatiki kana marobhoti application uye inoda kubviswa uye kugadzirisazve mune ese ari maviri kesi - zvichitungamira kukudzikira nguva uye kuwedzera mitengo.
Chikonzero chikuru che porosity musimbi welding is nitrogen (N2), iyo inopinda mumudziyo wewelding. Kana dziva remvura richitonhora pasi, kunyungudika kweN2 kunoderedzwa zvakanyanya uye N2 inobuda musimbi yakanyungudutswa, ichigadzira mabubbles (pores). Mune galvanized/galvanneal welding, evaporated zinc inogona kusimudzwa kupinda mudziva rewelding, uye kana pasina nguva yakakwana yekutiza dziva risati raoma, rinoita porosity. Kune aruminiyamu welding, porosity yese inokonzerwa nehydrogen (H2), nenzira imwechete iyo N2 inoshanda musimbi.
Welding porosity inogona kuoneka kunze kana mukati (inowanzonzi sub-surface porosity). Inogonawo kukura pane imwe nzvimbo pane weld kana pamwe nehurefu hwose, zvichiita kuti zvive zvisina simba welds.
Kuziva nzira yekuziva zvimwe zvinokonzeresa porosity uye nzira yekukurumidza kuzvigadzirisa zvinogona kubatsira kuvandudza mhando, kugadzirwa uye pasi pekupedzisira.
Yakashata Shielding Gasi Coverage
Kusadzivirira gasi kufukidzwa ndicho chikonzero chinowanzo konzera welding porosity, sezvo ichibvumira magasi emuchadenga (N2 neH2) kusvibisa dziva re weld. Kushaikwa kwekuvhara kwakakodzera kunogona kuitika nekuda kwezvikonzero zvakati, zvinosanganisira asi zvisingaganhurirwe kune hurombo hwekudzivirira gasi kuyerera, kudonha mugetsi gasi, kana kuyerera kwemhepo yakawandisa muweld cell. Mamhanyiro ekufamba anomhanya zvakanyanya anogonawo kuva honzeri.
Kana anoshanda achifungidzira kuti kuyerera kwakashata kuri kukonzera dambudziko, edza kugadzirisa gasi rekuyerera mita kuti uone kuti chiyero chakaringana. Paunenge uchishandisa kupfapfaidza mafambiro, semuenzaniso, 35 kusvika 50 cubic tsoka paawa (cfh) kuyerera kunofanira kukwana. Welding pama ampeges akakwira inoda kuwedzera kwekuyerera, asi zvakakosha kuti usaise mwero wakanyanya. Izvi zvinogona kukonzera kusagadzikana mune mamwe magadzirirwo epfuti anokanganisa kudzivirira kufukidzwa kwegasi.
Zvakakosha kuziva kuti pfuti dzakagadzirwa zvakasiyana dzine maitiro akasiyana ekuyerera kwegasi (ona mienzaniso miviri pazasi). Iyo "inotapira nzvimbo" yehuwandu hwekuyerera kwegasi yekugadzirwa kwepamusoro yakanyanya kukura kupfuura iyo yepasi dhizaini. Ichi chimwe chinhu chinoda kutariswa neinjiniya welding kana achimisikidza weld cell.
Dhizaini 1 inoratidza yakatsetseka gasi kuyerera pane inobuda nozzle
Dhizaini 2 inoratidza mhirizhonga gasi kuyerera panzvimbo yekubuda.
Uyezve tarisa kukuvadzwa kwepombi yegesi, zvigadziriso uye zvibatanidza, pamwe neO-mhete papini yemagetsi yeMIG welding gun. Tsiva sezvinodiwa.
Paunenge uchishandisa mafeni kutonhodza maopareta kana zvikamu muweld cell, chenjerera kuti haana anongedzerwa zvakananga panzvimbo yewelding paanogona kukanganisa kufukidzwa kwegasi. Isa chidzitiro muweld cell kudzivirira kubva kunze kwekuyerera kwemhepo.
Bata zvakare chirongwa mumarobhoti maapplication kuti uone kuti kune kwakaringana chinhambwe-ku-basa chinhambwe, icho chinowanzoita ½ kusvika 3/4 inch, zvichienderana nehurefu hwaunoda hwearc.
Chekupedzisira, inononoka kufamba kumhanya kana porosity ikaramba iripo kana kubvunza mutengesi weMIG pfuti kune akasiyana-ekupedzisira-ekupedzisira zvikamu zvine nani gasi kufukidzira.
Base Metal Kusvibiswa
Base metal kusvibiswa ndicho chimwe chikonzero porosity inoitika - kubva kumafuta uye girizi kusvika paguyo chiyero uye ngura. Hunyoro hunogonawo kukurudzira kusaenderera mberi uku, kunyanya mualuminium welding. Aya marudzi ezvinosvibisa anowanzo tungamira kune ekunze porosity inoonekwa kune anoshanda. Simbi yakabatiswa ndiyo inonyanya kuita subsurface porosity.
Kurwisa porosity yekunze, iva nechokwadi chekunyatsochenesa base base isati yave welding uye funga kushandisa simbi-cored welding waya. Rudzi urwu rwewaya rune mazinga akakwira e deoxidizer pane waya yakasimba, saka inoshivirira kune chero yakasara inosvibisa pane base zvinhu. Gara uchichengeta idzi uye chero dzimwe waya munzvimbo yakaoma, yakachena yetembiricha yakafanana kana yakakwira zvishoma pane chirimwa. Kuita izvi kunozobatsira kuderedza condensation iyo inogona kuunza hunyoro mukati meweld pool uye kukonzera porosity. Usachengete waya muimba inochengeterwa zvinhu inotonhora kana kunze.
Porosity, mhango-mhando discontinuities inoumbwa nekupinzwa kwegasi panguva yekusimba, yakajairika asi inorema kukanganisa muMIG welding uye imwe ine zvikonzero zvakati.
Kana welding galvanized simbi, zingi vaporize panguva yakaderera tembiricha kupfuura simbi inonyunguduka, uye kukurumidza kufamba kumhanya kunoita kuti weld dziva chando nokukurumidza. Izvi zvinogona kubata zinc mhute musimbi, zvichikonzera porosity. Kurwisa mamiriro aya nekutarisa kumhanya kwekufamba. Zvekare, funga zvakagadzirirwa (flux formula) simbi-cored waya inosimudzira zinc mhute kutiza kubva mudziva rewelding.
Yakavharwa uye/kana Undersized Nozzles
Yakavharwa uye / kana undersized nozzles inogona kukonzera porosity. Welding spatter inogona kukwira mumhuno uye pamusoro peiyo yekubata tipi uye diffuser inotungamira kune inodzivirirwa yekudzivirira gasi kuyerera kana kuita kuti iite mhirizhonga. Mamiriro ese ari maviri anosiya dziva weld ine dziviriro isina kukwana.
Kuwedzera mamiriro ezvinhu aya muromo idiki kwazvo pakushandisa uye inowanzoitika kune yakakura uye nekukurumidza spatter kuvaka. Madiki madiki anogona kupa zvirinani kupinda pamwe chete, asiwo kudzivirira gasi kuyerera nekuda kwediki diki-chikamu nzvimbo inotenderwa kuyerera kwegasi. Gara uchifunga nezve musiyano wetipi yekubata kune nozzle stickout (kana recess), sezvo ichi chinogona kuve chimwe chinhu chinokanganisa kudzivirira kuyerera kwegasi uye porosity nesarudzo yako yemuromo.
Uine izvo mupfungwa, ita shuwa kuti muromo wakakura zvakakwana kune application. Kazhinji, maapplication ane high welding current achishandisa masaizi ewaya hombe anoda muromo une hukuru hukuru.
Mune semi-otomatiki welding application, nguva nenguva tarisa kune welding spatter mumuromo uye bvisa uchishandisa welder's pliers (welpers) kana kutsiva muromo kana zvichidikanwa. Munguva yekuongorora uku, simbisa kuti iyo yekubata tipi iri muchimiro chakanaka uye kuti gasi diffuser ine yakajeka gasi madoko. Vashandi vanogonawo kushandisa anti-spatter compound, asi vanofanira kungwarira kuti vasanyudze muromo mukomboni kureba kana kwenguva yakareba, sezvo kuwanda kwekomboni kunogona kusvibisa gasi rinodzivirira uye kukuvadza kuvharwa kwenozzle.
Mune robhoti welding oparesheni, isa mari muchiteshi chekuchenesa nozzle kana reamer kurwisa spatter kuvaka. Iyi peripheral inochenesa muromo uye diffuser panguva yekumbomira mukugadzirwa kuitira kuti isakanganise nguva yekutenderera. Nozzle yekuchenesa zviteshi zvakagadzirirwa kushanda pamwe chete ne-anti-spatter sprayer, iyo inoshandisa jasi rakatetepa rekomboni kune zvikamu zvepamberi. Yakawandisa kana yakawandisa anti-spatter fluid inogona kukonzera kuwedzera porosity. Kuwedzera kuputika kwemhepo kune yekuchenesa nozzle maitiro kunogona zvakare kubatsira mukubvisa yakasununguka spatter kubva kune zvinodyiwa.
Kuchengetedza hutano uye kubudirira
Nekutarisira kutarisa maitiro ekushongedza uye nekuziva zvinokonzeresa porosity, zviri nyore kuita mhinduro. Kuita izvi kunogona kubatsira kuve nechokwadi chearc-panguva, mhedzisiro yemhando uye zvimwe zvakanaka zvikamu zvinofamba kuburikidza nekugadzirwa.
Nguva yekutumira: Kukadzi-02-2020
