Igobolondo likawoyela lihlangene elifushane, okubangela lesi simo ngenxa yokwehluleka kwangaphakathi kwemishini okufana ne-roller noma i-shaft eccentricity, noma amandla okushisela ngokweqile, noma ezinye izizathu. Njengoba ijubane lokushisela likhula, isivinini se-tube blank extrusion siyakhula. Lokhu kusiza ukukhishwa kwezingqimba zensimbi eziwuketshezi nama-oxide ashisiswe ukuze ancibilike abe yikhwalithi ephezulu yokushisela. Ngesikhathi esifanayo, ukwandisa isivinini sokushisela kunganciphisa isikhathi sokushisa kwendawo ye-groove, ukuze isifunda esifushane samafutha singafinyezwa futhi indawo ethintekile yokushisa ingancishiswa.

Ngokuphambene nalokho, akuyona indawo ethintekile ekushiseni kuphela ebanzi, kodwa futhi ungqimba oluncane lwenhlanganisela yensimbi ewuketshezi olwakhiwe endaweni eyi-groove luba lugqinsi, bese kukhiqizwa ama-burrs amakhulu, okona ikhwalithi ye-weld. Kodwa-ke, emandleni athile okukhipha, isivinini sokushisela esibandayo asikwazi ukunyuswa ngaphandle komkhawulo. Uma kungenjalo, ukushisa ezinhlangothini zombili ze-billet groove ngeke kufinyelele izinga lokushisa lokushisela, ukuze kube khona ukukhubazeka noma ukungabikho nhlobo.

Ngensimbi engagqwali, i-coefficient ehlangene ye-ripple emfushane ithinta ukwakheka kwama-welds. Ukuhlunga amandla kunciphisa i-ripple ibe ngaphansi kuka-1%. Lapho ushisela insimbi engagqwali, imvamisa imvamisa kuba ama-welds angama-200 anokuqina okuhle kanye nendawo ethintekile yokushisa. . Ngokuvamile, izindonga zangaphakathi nangaphandle zepayipi elihlanganisiwe zifafazwa emuva kusukela endaweni yokushisela. Amagwebu amaphakathi, aqhubekayo aphakamisa ukuthi amandla okushisela anele futhi isimo sokusebenza asilingani futhi izimo zokushisela ezimnyama zegwebu azilingani futhi izinga lokushisela liphansi.