I-Porosity, ukungaqhubeki kohlobo lwe-cavity okwakhiwa ukuvaleka kwegesi ngesikhathi sokuqina, kuyisici esivamile kodwa esinzima ekushiseleni kwe-MIG kanye nesinye esinezimbangela ezimbalwa. Ingavela ezinhlelweni ezizenzakalelayo noma zerobhothi futhi idinga ukususwa nokusebenza kabusha kuzo zombili izimo - okuholela esikhathini sokuphumula kanye nezindleko ezikhulayo.
Isizathu esikhulu sokuqina kokushisela kwensimbi yi-nitrogen (N2), ebandakanyeka echibini lokushisela. Lapho i-pool ye-liquid iphola, ukuncibilika kwe-N2 kuncipha kakhulu futhi i-N2 iphuma ensimbi encibilikisiwe, yakhe amabhamuza (izimbotshana). Ku-galvanized/galvanneal welding, i-zinc ehwamukile ingashukunyiswa echibini lokushisela, futhi uma singekho isikhathi esanele sokuphunyuka ngaphambi kokuba ichibi liqine, kwakha i-porosity. Ngokushisela i-aluminium, yonke i-porosity ibangelwa i-hydrogen (H2), ngendlela efanayo ne-N2 esebenza ngayo ensimbi.
I-Welding porosity ingavela ngaphandle noma ngaphakathi (ngokuvamile ibizwa ngokuthi i-sub-surface porosity). Ingase futhi ithuthuke endaweni eyodwa ku-weld noma kubo bonke ubude, okuholela ekushiseni okubuthakathaka.
Ukwazi ukuthi ungazihlonza kanjani ezinye izimbangela ezibalulekile ze-porosity nokuthi ungazixazulula kanjani ngokushesha kungasiza ukuthuthukisa ikhwalithi, ukukhiqiza kanye nesisekelo.
Ukufakwa Kwegesi Yokuvikela Okumpofu
Ukungavikeleki kahle kwegesi okuyimbangela ejwayeleke kakhulu ye-welding porosity, njengoba ivumela amagesi asemoyeni (N2 kanye ne-H2) ukuthi angcolise i-weld pool. Ukuntuleka kokumbozwa okufanele kungenzeka ngenxa yezizathu ezimbalwa, ezihlanganisa kodwa ezingagcini nje ngezinga lokugeleza kwegesi elivikelayo elibi, ukuvuza kumzila wegesi, noma ukugeleza komoya omningi kuseli yokushisela. Izivinini zokuhamba ezishesha kakhulu nazo zingaba yicala.
Uma osebenzisa igesi esola ukuthi ukugeleza okungalungile kuyimbangela yenkinga, zama ukulungisa imitha yokugeleza kwegesi ukuze uqinisekise ukuthi izinga lanele. Uma usebenzisa imodi yokudlulisa isifutho, isibonelo, ukugeleza okungu-35 kuya ku-50 cubic feet ngehora (cfh) kufanele kwanele. Ukushisela kuma-amperage aphezulu kudinga ukukhuphuka kwezinga lokugeleza, kodwa kubalulekile ukuthi ungasethi izinga libe phezulu kakhulu. Lokhu kungase kubangele isiyaluyalu kweminye imiklamo yezibhamu ephazamisa ukumbozwa kwegesi.
Kubalulekile ukuqaphela ukuthi izibhamu eziklanywe ngendlela ehlukile zinezici ezihlukene zokugeleza kwegesi (bheka izibonelo ezimbili ngezansi). "Indawo emnandi" yezinga lokugeleza kwegesi kumklamo ophezulu likhulu kakhulu kunelo lomklamo ophansi. Lokhu kuyinto unjiniyela wokushisela okudingeka ayicabangele lapho emisa iseli lokushisela.
Idizayini 1 ibonisa ukugeleza kwegesi okubushelelezi endaweni yokukhipha umlomo
Idizayini yesi-2 ikhombisa ukugeleza kwegesi okuneziyaluyalu endaweni yokukhipha umlomo.
Futhi hlola umonakalo wepayipi legesi, okokufakwa nezixhumi, kanye nama-O-rings ephinini lamandla lesibhamu sokushisela i-MIG. Faka esikhundleni njengoba kudingeka.
Uma usebenzisa abalandeli ukupholisa ama-opharetha noma izingxenye ze-weld cell, qaphela ukuthi azikhonjwa ngqo endaweni yokushisela lapho zingase ziphazamise ukumbozwa kwegesi. Beka isikrini kuseli yokushisela ukuze uvikele ekugelezeni komoya kwangaphandle.
Thinta kabusha uhlelo kuzinhlelo zokusebenza zerobhothi ukuze wenze isiqiniseko sokuthi kunebanga elifanele lethiphu ukuya emsebenzini, ngokuvamile eliyi-intshi engu-½ ukuya ku-3/4, kuye ngobude obufunekayo be-arc.
Okokugcina, isivinini sokuhamba esihamba kancane uma i-porosity iphikelela noma thintana nomhlinzeki wesibhamu we-MIG ukuze uthole izingxenye ezingaphambili ezingaphambili ezinekhava yegesi engcono.
Ukungcoliswa kwe-Base Metal
Ukungcoliswa kwensimbi okuyisisekelo kungesinye isizathu esenza ukuba kube ne-porosity - kusuka kuwoyela namafutha kuya esikalini sokugaya nokugqwala. Umswakama ungaphinde ukhuthaze lokhu kungasebenzi, ikakhulukazi ekushiseleni kwe-aluminium. Lezi zinhlobo zokungcola ngokuvamile ziholela ku-porosity yangaphandle ebonakalayo ku-opharetha. Insimbi enama-galvanized ithambekele kakhulu ku-subsurface porosity.
Ukuze ulwe ne-porosity yangaphandle, qiniseka ukuthi uhlanza kahle isisekelo ngaphambi kokushisela futhi ucabange ukusebenzisa intambo yokushisela ene-metal cored. Lolu hlobo lwezintambo lunamazinga aphezulu ama-deoxidizer kunezintambo eziqinile, ngakho-ke lubekezelela noma yikuphi ukungcola okusele kusisekelo. Njalo gcina lezi zintambo kanye nanoma yiziphi ezinye endaweni eyomile, ehlanzekile enezinga lokushisa elifanayo noma elingaphezulu kancane kunesitshalo. Ukwenza lokhu kuzosiza ukunciphisa ukujiya okungangenisa umswakama echibini lokushisela futhi kubangele i-porosity. Ungazigcini izintambo endaweni yokugcina impahla ebandayo noma ngaphandle.
I-Porosity, ukungaqhubeki kohlobo lwe-cavity okwakhiwa ukuvaleka kwegesi ngesikhathi sokuqina, kuyisici esivamile kodwa esinzima ekushiseleni kwe-MIG kanye nesinye esinezimbangela ezimbalwa.
Lapho kushiselwa insimbi eyakha uthayela, i-zinc iyahwamuka ezingeni lokushisa eliphansi kunelensimbi encibilika, futhi isivinini sokuhamba esisheshayo sivame ukwenza i-weld pool ibe yiqhwa ngokushesha. Lokhu kungabamba umhwamuko we-zinc ensimbi, okuholela ekuqineni. Ukulwa nalesi simo ngokuqapha isivinini sohambo. Futhi, cabangela intambo eklanywe ngokukhethekile (ifomula egelezayo) enezintambo zensimbi ekhuthaza ukuphuma komhwamuko we-zinc echibini lokushisela.
Imilomo Evalekile kanye/noma Engalinganiselwe
Imilomo evalekile kanye/noma engaphansi ngobukhulu nayo ingadala i-porosity. I-spatter ye-welding ingakheka ku-nozzle nangaphezulu kwethiphu yokuxhumana kanye ne-diffuser eholela ekugelezeni kwegesi evikelekile noma ukuyibangela ukuba ibe nesiyaluyalu. Zombili izimo zishiya i-weld pool nokuvikelwa okunganele.
Okwengeza lesi simo umbhobho omncane kakhulu ukuthi ungafakwa futhi othambekele kakhulu ekwakhekeni kwesiphalazi esikhulu nesisheshayo. Imibhobho emincane inganikeza ukufinyelela okungcono ngokuhlanganyela, kodwa futhi ivimbele ukugeleza kwegesi ngenxa yendawo encane ephambanayo evunyelwe ukugeleza kwegesi. Ngaso sonke isikhathi khumbula ukuhlukahluka kwethiphu yokuxhumana ukuya ku-nozzle stickout (noma ikhefu), njengoba lokhu kungaba enye into ethinta ukuvikela ukugeleza kwegesi kanye ne-porosity ngokukhetha kwakho umlomo wombhobho.
Unalokho engqondweni, qiniseka ukuthi umlomo wombhobho mkhulu ngokwanele ukufaka isicelo. Ngokuvamile, izinhlelo zokusebenza ezine-welding ephezulu yamanje ezisebenzisa osayizi abakhulu bezintambo zidinga umlomo wombhobho onamasayizi amakhulu.
Ezinhlelweni zokushisela ze-semi-automatic, hlola ngezikhathi ezithile ukuthi azikho yini i-spatter yokushisela ku-nozzle bese ususa usebenzisa amapulangwe okushisela (ama-welpers) noma shintsha umbhobho uma kunesidingo. Phakathi nalokhu kuhlola, qinisekisa ukuthi ithiphu yokuxhumana isesimweni esihle nokuthi isixhumi segesi sinezimbobo zegesi ezicacile. Ama-opharetha angaphinda asebenzise inhlanganisela ye-anti-spatter, kodwa kufanele baqikelele ukuthi bangacwilisi umlomo wombhobho enkomponi kude kakhulu noma isikhathi eside, njengoba amanani eqile enhlanganisela angonakalisa igesi evikelayo futhi alimaze ukuvala umlomo.
Emsebenzini wokushisela i-robotic, tshala endaweni yokuhlanza umlomo wombhobho noma i-reamer ukuze ulwe nokwakheka kwe-spatter. Le peripheral ihlanza umlomo wombhobho kanye ne-diffuser ngesikhathi sokuphumuza okujwayelekile ekukhiqizeni ukuze ingaphazamisi isikhathi somjikelezo. Iziteshi zokuhlanza i-nozzle zihloselwe ukusebenza ngokubambisana ne-anti-spatter sprayer, efaka ijazi elincanyana le-compound ezingxenyeni zangaphambili. Uketshezi oluningi kakhulu noma oluncane kakhulu lwe-anti-spatter lungaholela ekwengezeni kwe-porosity. Ukwengeza ukuqhuma komoya enqubweni yokuhlanza umlomo wombhobho nakho kungasiza ekususeni i-spatter evulekile ezintweni ezisebenzisekayo.
Ukugcina izinga kanye nokukhiqiza
Ngokuqaphela ukuqapha inqubo yokushisela nokwazi izimbangela ze-porosity, kulula kakhulu ukusebenzisa izixazululo. Ukwenza kanjalo kungasiza ekuqinisekiseni isikhathi esiningi, imiphumela yekhwalithi kanye nezingxenye ezinhle kakhulu ezihamba ngokukhiqiza.
Isikhathi sokuthumela: Feb-02-2020
