Kungani ama-single-pass stainless steel weld esebenzisa i-FCAW ehlala ehluleka ukuhlola?UDavid Meyer noRob Koltz babhekisisa izizathu zalokhu kwehluleka.Getty Images
Q: Silungisa ama-scrapers ensimbi ashiselwe ohlelweni lokomisa endaweni emanzi.Ama-welds ethu ahlulekile ukuhlolwa ngenxa ye-porosity, ama-undercuts kanye nama-welds aqhekekile.Sishisela i-A514 kuya ku-A36 sisebenzisa ububanzi obungu-0.045″, yonke indawo, i-cored 309L, i-75% ye-Argon ye-Carbon / 25% yokumelana ne-Carbon wear kangcono.
Sazama ama-electrode ensimbi ye-carbon steel, kodwa ama-welds aguga ngokushesha futhi sathola insimbi engagqwali ukuthi isebenze kangcono.Konke ukushisela kwenziwa endaweni eyisicaba futhi 3/8″ ubude.Ngenxa yemikhawulo yesikhathi, konke ukushisela kwenziwa ngesikhathi esisodwa.Yini engabangela ukushisela kwethu ukuthi kuhluleke?
I-undercut ivamise ukwenzeka ngenxa yokuphuma kwezimiso zokushisela, indlela yokushisela engafanele, noma kokubili.Asikwazi ukuphawula ngemingcele yokushisela ngoba asiyazi.Ama-undercuts avela ku-1F ngokuvamile abangelwa ukusebenza kwe-weld puddle esheshisa kakhulu noma isivinini sohambo esihamba kancane kakhulu.
Njengoba umshiseli ezama ukufaka idiphozi engu-3/8″. Amathuba okuphatha ithoshi ngokweqile angase abe nesibopho ngokuyingxenye yokushisela i-single-pass fillet ngocingo olune-diameter encane ene-flux-core.
I-porosity ibangelwa ukungcola kwe-weld, ukulahlekelwa noma ukweqisa kwegesi evikelayo, noma ukumuncwa komswakama owedlulele we-flux-coreed wire.Usho ukuthi lokhu kuwumsebenzi wokulungisa emithonjeni emanzi ngaphakathi kwesomisi, ngakho-ke uma ama-welds engahlanzwa kahle, lokhu kungase kube imbangela eyinhloko ye-voids.
I-filler metal oyisebenzisayo iwucingo olunamakhova e-position flux, lezi zinhlobo zezintambo zinesistimu ye-slag eqandayo esheshayo. Lokhu kuyadingeka ukuze kusekelwe i-weld puddle lapho ishiselwa phezulu noma phezulu. Ububi be-slag esheshayo ebanda kakhulu ukuthi iyaqina ngaphambi kwe-weld pool ngaphansi kwayo. ngentambo encane yobubanzi futhi uzama ukufaka i-weld enkulu endaweni eyodwa, njengasohlelweni lwakho lokusebenza.
Ukuqhekeka kwe-weld ekuqaleni nokuma kwe-weld kungabangelwa izizathu eziningi.Njengoba ubeka ubuhlalu obukhulu obunocingo oluncane oluyi-diameter, kungenzeka ukuthi uthole ukuhlangana okunganele (LOF) empandeni ye-weld.Ukuqhekeka kwe-weld kuyinto evamile ngenxa yokucindezeleka okuphezulu kwe-weld eyinsalela kanye ne-LOF empandeni.
Kulo sayizi wezintambo, kufanele usebenzise amaphasi amabili noma amathathu ukuze uqedele u-3/8 we-inch.I-Fillet welds, akekho.Ungakuthola kushesha ukwenza ama-welds angenasici amathathu kunokwenza i-weld eyodwa enesici bese kufanele uyilungise.
Kodwa-ke, enye inkinga engase idlale indima enkulu ekuqhekekeni kwe-weld izinga elingalungile le-ferrite ekushiseleni, okuvame ukuba yimbangela eyinhloko yokuqhekeka.309L wire yathuthukiselwa ukushisela insimbi engagqwali ku-carbon steel kune-carbon steel to carbon steel.Ikhemistri ethize ye-weld yalo mkhiqizo iphinde icabangele enye isisekelo sokuhlanjululwa kwensimbi kuzo zombili izinsimbi eziyisisekelo.Ngakho-ke, ekubunjweni kwe-carbon stainless ukukhiqiza insimbi engagqwali kuya ekukhiqizeni insimbi engagqwali ukukhiqiza insimbi engagqwali, i-carbon steel stainless ikhiqiza insimbi engagqwali. amanani amukelekayo e-ferrite.Ukusebenzisa i-filler metal ene-ferrite engaba ngu-50%, njenge-312 noma i-2209, kuzoqeda amathuba okuqhekeka ngenxa yokuqukethwe kwe-ferrite ephansi.
Indlela engcono kakhulu yokuhlinzeka ngokumelana nokugqokwa okuhle kakhulu ukushisela ijoyini nge-carbon standard noma i-electrode yensimbi engagqwali bese wengeza ungqimba lwe-electrode engaphezulu.Nokho, usho ukuthi ungaphansi kwemikhawulo yesikhathi ebambene kakhulu nokuthi noma yisiphi isimo sokushisela se-multi-pass singaphandle kombuzo.
Zama ukuguqulela ocingweni olubanzi lwe-diameter, olufana ne-intshi engu-1/16 noma enkulu. Ukusebenzisa intambo ene-gas-shielded flux-core kuhle ngoba kunikeza ukuhlanzeka okungcono kakhulu kwe-weld kanye nokuvikela okungcono kokugeleza komoya kunezintambo ezinezintambo ezingenazintambo. noma 2209.
I-WELDER, eyake yabizwa ngokuthi i-Practical Welding Today, ibonisa abantu bangempela abenza imikhiqizo esiyisebenzisayo nesisebenza ngayo nsuku zonke.Lo magazini ususebenzele umphakathi wokushisela eNyakatho Melika iminyaka engaphezu kwengu-20.
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