I-Welding steel stainless stainless tubing kunye nemibhobho idla ngokufuna ukuhlanjululwa ngasemva kunye ne-argon xa usebenzisa iinkqubo zemveli ezifana ne-gas tungsten arc welding (GTAW) kunye ne-shielded metal arc welding (SMAW) .Kodwa ixabiso legesi kunye nexesha lokumisela inkqubo yokucoca inokubaluleka, ngakumbi njengoko ububanzi bombhobho kunye nobude bukhula.
Xa welding 300 series steel stainless, iikontraka unako ukuphelisa blowback kwi welds ingcambu evulekileyo canal ngokutshintsha ukusuka GTAW zemveli okanye SMAW ukuya inkqubo ukuwelda oluphuculweyo, lo gama ukuphumeza umgangatho weld eliphezulu, ukugcina ukumelana umhlwa izinto, kunye nokudibana The Welding Procedure Specification (WPS) ifuna i-short-circuit ye-gas ye-gas eyongezelelweyo i-arc-WPS inkqubo yokuphucula imveliso ye-GG ye-metal arcWW (i-GG imveliso ye-metal arcWW). ukusebenza, ukusebenza kakuhle kunye nokulula kokusetyenziswa, ukunceda ukuphucula inzuzo.
Ithandwa ngenxa yokumelana nokubola kunye namandla, i-alloys yensimbi engenasici isetyenziswa kwimibhobho emininzi kunye nezicelo ze-tubing, kubandakanywa ioli kunye negesi, i-petrochemical, kunye ne-biofuels.Ngeli xesha i-GTAW isetyenziswe ngokwesiko kwizicelo ezininzi zensimbi engenasici, inezinto ezingalunganga ezinokuqwalaselwa ngokuphucula i-GMAW yesiphaluka esifutshane.
Okokuqala, njengoko ukunqongophala kwabasebenzi be-welders abanobuchule kuqhubeka, ukufumana abasebenzi abaqhelana ne-GTAW ngumngeni oqhubekayo.Okwesibini, i-GTAW ayiyona inkqubo yokudibanisa ngokukhawuleza, ethintela iinkampani ezijonge ukwandisa imveliso ukuhlangabezana neemfuno zabathengi.Okwesithathu, kufuna ixesha elide kunye neendleko zokubuyela emva kwe-tubing yensimbi engenasici.
Yintoni i-blowback?Ukuhlanjululwa kukuqaliswa kwegesi ngexesha lenkqubo ye-welding ukususa ukungcola kunye nokubonelela ngenkxaso.I-backside purge ikhusela umva we-weld ekwenzeni ii-oxides ezinzima phambi kwe-oksijini.
Ukuba i-backside ayikhuselwanga ngexesha le-welding ye-root canal evulekileyo, umonakalo kwi-substrate unokubangela. Oku kuphuka kubizwa ngokuba yi-saccharification, ebizwa ngokuba yi-surface ebonakala ngathi iswekile ngaphakathi kwe-weld. baxobula icandelo leteyiphu ejikeleze umdibaniso kwaye baqalisa ukuwelda, baphinda inkqubo yokuhluba kunye nokuwelda de ingcambu yentsimbi igqitywe.
Ukuphelisa i-blowback.I-retraces inokubiza ixesha elininzi kunye nemali, kwezinye iimeko zongeza amawaka eedola kwiprojekthi.Ukuguqulwa kwenkqubo ye-GMAW ephuculweyo ye-short-circuit ivumela inkampani ukuba igqibe ukudlula kweengcambu ngaphandle kokubuyela emva kwezicelo ezininzi zensimbi engenasici.Izicelo ze-Welding ze-300 series steels stainless zifaneleka kakuhle kule nto, ngelixa izicelo ze-welding ze-welding ze-stainless ze-GTA zifuna i-stainless ye-GTA okwangoku ifuna i-stainless ye-stainple.
Ukugcina igalelo lobushushu liphantsi kangangoko kunokwenzeka kunceda ukugcina ukuxhathisa kwe-corrosion ye-workpiece.Ukunciphisa inani le-weld passs yindlela enye yokunciphisa igalelo lobushushu.Ukuphuculwa kwenkqubo emfutshane ye-GMAW yesiphaluka, njenge-Regulated Metal Deposition (RMD®), sebenzisa ukuhanjiswa kwetsimbi elawulwa ngokuchanekileyo ukubonelela nge-droplet efanayo. ukukhenkceza ngokukhawuleza.
Ngokudluliselwa kwesinyithi esilawulwayo kunye nokukhenkceza kwe-weld pool ngokukhawuleza, i-weld pool iyancipha kwaye i-gas yokukhusela ishiya i-GMAW gun ingaphazanyiswa.
Uvavanyo lubonise ukuba inkqubo ye-GMAW eguquliweyo ye-short-circuit ihlangabezana nemigangatho yomgangatho we-weld ngelixa igcina ukunyanzeliswa kwe-corrosion ye-stainless steel njengaxa i-root bead idityaniswe ne-GTAW.
Utshintsho kwinkqubo yokuwelda ifuna ukuba inkampani iphinde iqinisekise iWPS yayo, kodwa olo tshintsho lunokubonelela ngembuyekezo enkulu yexesha kunye nogcino lweendleko zokwenziwa komsebenzi omtsha kunye nokulungisa.
Vula i-root canal welding usebenzisa inkqubo ye-GMAW ephuculweyo ye-short-circuit ibonelela ngeenzuzo ezongezelelweyo kwimveliso, ukusebenza kakuhle kunye noqeqesho lwe-welder.Ezi ziquka:
Ukuphelisa amandla amajelo ashushu ngenxa yokukwazi ukufaka isinyithi esingaphezulu ukunyusa ubukhulu bomzila weengcambu.
Ukunyamezela okugqwesileyo kokungalungelelanisi okuphezulu kunye nokuphantsi phakathi kwamacandelo ombhobho.Ngenxa yokuhanjiswa kwentsimbi egudileyo, inkqubo inokuvala ngokulula izikhewu ukuya kuthi ga kwi-3⁄16 intshi.
Ubude be-arc buhambelanayo kungakhathaliseki ukuba i-electrode isandiso, esihlawulela abaqhubi abazama ukugcina ukwandiswa okungaguqukiyo.I-puddle ye-weld elawulwa ngokulula kunye nokuhanjiswa kwentsimbi okuhambelanayo kunokunciphisa ixesha loqeqesho lwabatsha abatsha.
Ukunciphisa ixesha lokunciphisa inkqubo yokutshintsha.Ucingo olufanayo kunye negesi yokukhusela ingasetyenziselwa ingcambu, i-fill and cap channels.Inkqubo ye-GMAW ye-pulsed ingasetyenziswa ngaphandle kokuba imijelo izaliswe kwaye ifakwe ubuncinane i-80% ye-argon shielding gas.
Imisebenzi efuna ukuphelisa i-backflush kwi-stainless steel applications, kubalulekile ukuba ulandele iingcebiso ezintlanu eziphambili zokuphumelela xa utshintshela kwinkqubo ye-GMAW emfutshane eguqulwayo.
Coca ngaphakathi nangaphandle kwimibhobho ukuze ususe nayiphi na into engcolileyo.Sebenzisa ibrashi yocingo eyenzelwe insimbi engenasici ukucoca umva wokudibanisa ubuncinane i-intshi eyi-1 ukusuka kumda.
Sebenzisa isinyithi esingenasici sokuzalisa isinyithi esinomxholo ophezulu we-silicon, njenge-316LSi okanye i-308LSi.Umxholo ophezulu we-silicon uncedisa ukumanzisa kwe-weld pool kwaye isebenza njenge-deoxidizer.
Ukusebenza kakuhle, sebenzisa umxube wegesi okhuselayo owenziwe ngokukodwa kwinkqubo, njenge-90% ye-helium, i-7.5% ye-argon, kunye ne-2.5% ye-carbon dioxide.Enye inketho yi-98% ye-argon kunye ne-2% ye-carbon dioxide.Umthengisi we-welding gas unokuba nezinye iingcebiso.
Ukufumana iziphumo ezingcono, sebenzisa incam ecociweyo kunye nombhobho wokuhambisa ingcambu ukuze ufumane indawo yokugquma irhasi.
Qaphela ukuba ukusebenzisa inkqubo ye-GMAW ye-short-circuit ye-GMAW ngaphandle kokuxhaswa kwegesi kuvelisa inani elincinci lokulinganisa kwi-weld.
UJim Byrne unguMlawuli weeNtengiso kunye neZicelo zeMiller Electric Mfg. LLC, 1635 W. Spencer St., Appleton, WI 54912, 920-734-9821, www.millerwelds.com.
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