Insimbi engagqwali ephindwe kabili inesakhiwo esincane esinezigaba ezimbili lapho ingxenye yevolumu ye-ferrite ne-austenite icishe ibe ngu-50%. Ngenxa yesakhiwo sayo esincane esinezigaba ezimbili, lezi zinsimbi zihlanganisa izakhiwo ezinhle kakhulu zensimbi engagqwali ye-ferritic ne-austenitic. Ngokuvamile, isigaba se-ferrite (i-cubic lattice egxile emzimbeni) sinikeza amandla aphezulu omshini, ukuqina okuhle kanye nokumelana okuhle nokugqwala, kuyilapho isigaba se-austenite (i-cubic lattice egxile ebusweni) sinikeza ukuguquguquka okuhle.
Ukuhlanganiswa kwalezi zakhiwo yingakho izinsimbi ezingagqwali ezimbili zisetshenziswa kabanzi embonini ye-petrochemical, pulp kanye nephepha, olwandle kanye nezimboni zokuphehla ugesi. Zingamelana nemidiya egqwalisayo, zandise isikhathi sesevisi, futhi zisebenze ezimweni zemvelo ezimbi kakhulu.
Izinto eziqinile kakhulu zikuvumela ukuthi unciphise ukujiya kwezingxenye kanye nesisindo. Isibonelo, insimbi engagqwali ye-super duplex inganikeza amandla okukhiqiza aphezulu ngokuphindwe kathathu kuya kane kanye nokumelana okuphezulu nokugqwala kwemigodi kunensimbi engagqwali engu-316.
Izinsimbi ezingagqwali ezimbili zihlukaniswa ngamabanga amathathu ngokusekelwe kokuqukethwe kwe-gravimetric chromium (Cr) kanye nenombolo elinganayo yokumelana nemigodi (PREN):
Esinye sezici ezibalulekile zokushisela i-DSS, i-SDSS, i-HDSS kanye nezinsimbi ezingenalutho ezikhethekile ze-alloy ukulawula amapharamitha okushisela.
Izidingo zenqubo yokushisela embonini ye-petrochemical zinquma inani eliphansi le-PREN elidingekayo kwizinsimbi zokugcwalisa. Isibonelo, i-DSS idinga i-PREN engama-35 kanti i-SDSS idinga i-PREN engama-40. Isithombe 1 sibonisa i-DSS kanye nensimbi yayo yokugcwalisa ehambisana ne-GMAW ne-GTAW. Ngokuvamile, okuqukethwe kwe-Cr kwensimbi yokugcwalisa kuzofana nokwensimbi eyisisekelo. Umkhuba owodwa okufanele uwucabangele lapho usebenzisa i-GTAW yezimpande neziteshi ezishisayo ukusebenzisa izinsimbi zokugcwalisa ze-superalloy. Uma insimbi yokugcwalisa ingalingani ngenxa yobuchwepheshe obubi, insimbi yokugcwalisa exutshwe ngokweqile inganikeza i-PREN efiselekayo kanye namanye amanani esampula ehlanganisiwe.
Njengesibonelo sokukhombisa lokhu, abanye abakhiqizi batusa ukusebenzisa ucingo lokugcwalisa lwe-SDSS (25% Cr) kuma-alloy asekelwe ku-DSS (22% Cr), kanye nocingo lokugcwalisa lwe-HDSS (27% Cr) kuma-alloy asekelwe ku-SDSS (25% Cr). Kuma-alloy asekelwe ku-HDSS, ungasebenzisa futhi ucingo lokugcwalisa lwe-HDSS. Le nsimbi engagqwali ye-austenitic-ferritic duplex ine-ferrite engaba ngu-65%, i-chromium engu-27%, i-nickel engu-6.5%, i-molybdenum engu-5% futhi ibhekwa njengengaphansi kwe-carbon ephansi engu-0.015%.
Uma kuqhathaniswa ne-SDSS, ukupakisha kwe-HDSS kunamandla aphezulu okukhiqiza kanye nokumelana okungcono nokugqwala kwemigodi kanye nokuqhekeka. Kuphinde kube nokumelana okuphezulu nokuqhekeka kokucindezeleka okubangelwa yi-hydrogen kanye nokumelana okuphezulu ezindaweni ezine-asidi enamandla kune-SDSS. Amandla ayo aphezulu asho amazinga aphansi okulungisa ngesikhathi sokukhiqizwa kwamapayipi, njengoba ukuhlaziywa kwezinto ezilinganiselwe kungadingeki ukuze kusetshenziswe insimbi yokushisela enamandla afanayo, futhi izindlela zokwamukela zingaba zincane kakhulu.
Njengoba kunikezwe ububanzi bezinto zokwakha eziyisisekelo, izidingo zemishini kanye nezimo zesevisi, sicela ucabangele ukubonisana nochwepheshe wesicelo se-DSS kanye nensimbi yokugcwalisa ngaphambi kokuqala iphrojekthi yakho elandelayo.
I-WELDER, eyayibizwa ngokuthi i-Practical Welding Today, ibonisa abantu bangempela abenza imikhiqizo esiyisebenzisayo nesisebenza ngayo nsuku zonke. Lo magazini ukhonze umphakathi wokushisela eNyakatho Melika iminyaka engaphezu kwengu-20.
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