I-Induction PWHT (I-Post Weld Heat Treatment) iyinqubo esetshenziswa ekushiseleni ukuze kuthuthukiswe izakhiwo zemishini kanye nokunciphisa izingcindezi eziyinsalela ekuhlanganyeleni okushiselwe. Kubandakanya ukushisisa ingxenye eshiselwe ezingeni lokushisa elithile futhi uyibambe kulelo zinga lokushisa isikhathi esithile, kulandele ukupholisa okulawulwayo.
Indlela yokushisisa yokungenisa isebenzisa ukungeniswa kwe-electromagnetic ukukhiqiza ukushisa ngqo ngaphakathi kwento ephathwayo. Ikhoyili ye-induction ibekwa eduze kwejoyinti elishiselwe, futhi lapho umsinga oshintshashintshayo udlula kuwo, idala inkambu kazibuthe engenisa ama-eddy currents endabeni. Lawa ma-eddy currents akhiqiza ukushisa ngenxa yokumelana, okuholela ekushiseni okwasendaweni kwendawo yokushisela.
Inhloso ye-PWHT yokungeniswa iwukukhulula izingcindezi ezinsalela okungenzeka ukuthi zethulwe ngesikhathi sokushisela, okungabangela ukuhlanekezela noma ukuqhekeka kwengxenye. Kuyasiza futhi ukucwenga i-microstructure yendawo yokushisela, ithuthukise ukuqina kwayo futhi inciphise amathuba okuba sengozini yokuphuka kwe-brittle.
I-PWHT yokungeniswa ivame ukusetshenziswa ezimbonini ezifana nowoyela negesi, amakhemikhali e-petrochemicals, ukukhiqiza ugesi, nokwakhiwa, lapho kudingeka khona ukushisela kwekhwalithi ephezulu ngezizathu zokuphepha nokusebenza.
Inhloso ye-PWHT ukunciphisa izingcindezi eziyinsalela ezingaholela ekuhlanekeni noma ekuqhekekeni kwengxenye eshiselwe. Ngokufaka i-weldment emijikelezweni yokushisa neyokupholisa elawulwayo, noma yikuphi ukucindezeleka okusalayo kuyakhululeka kancane kancane, okwenza ngcono ubuqotho buphelele be-weld.
Izinga lokushisa elithile kanye nobude besikhathi be-PWHT kuncike ezintweni ezifana nohlobo lwempahla, ukujiya, inqubo yokushisela esetshenziswayo, kanye nezakhiwo ezifiselekayo zemishini. Inqubo ngokuvamile yenziwa ngemva kokuba ukushisela sekuqediwe kodwa ngaphambi kokuba kusetshenziswe imishini yokugcina noma imithi yokwelapha engaphezulu.
Umshini wokwelapha ukushisa kwe-induction post weld uyithuluzi elikhethekile elisetshenziswa embonini yokushisela ukwenza ukwelashwa kokushisa ezingxenyeni ezishiselwe.
Ngemva kokushisela, isakhiwo sensimbi singase sibe nokucindezeleka okusalayo kanye noshintsho lwezakhiwo ezibonakalayo ngenxa yamazinga okushisa aphezulu ahilelekile enqubweni yokushisela. Ukwelashwa kokushisa kwe-post weld (PWHT) kwenziwa ukuze kudambise lokhu kucindezeleka futhi kubuyiselwe izakhiwo zemishini.
The ukufakwa komshini we-PWHT isebenzisa induction ye-electromagnetic ukuze ikhiqize ukushisa ngaphakathi kwengxenye eshiselwe. Iqukethe ikhoyili yokungeniswa edala inkambu kazibuthe ezungeze ucezu lokusebenza, idonsa amaza kagesi ngaphakathi kwayo. Le misinga ikhiqiza ukushisa ngokumelana, ishisa ingxenye ngokulinganayo.
Umshini ngokuvamile uhlanganisa izilawuli zokulungisa izinga lokushisa, isikhathi, namanye amapharamitha ukuze uhlangabezane nezidingo ezithile zokwelashwa kokushisa. Ingase futhi ibe nezinhlelo zokupholisa noma izinto zokuvikela ukulawula izinga lokupholisa ngemva kokufudumeza.
Imishini ye-PWHT yokungeniswa ihlinzeka ngezinzuzo ezimbalwa kunezindlela zendabuko ezifana nokushisisa isithando somlilo noma ukushisisa ilangabi. Banikeza ukufudumeza okunembile nokwasendaweni, ukunciphisa ukuhlanekezela okushisayo nokunciphisa ukusetshenziswa kwamandla. Inqubo yokungeniswa iphinde ivumele amazinga okushisa asheshayo kanye nezikhathi zomjikelezo omfushane uma kuqhathaniswa nezindlela ezivamile.
Sekukonke, ukwelashwa kokushisa kwe-induction post weld kusiza ukuqinisekisa ukuthi izingxenye ezishiselwe zihlangabezana nezindinganiso ezidingekayo zamandla, ukuqina, nokuthembeka.