Umbhobho odityanisiweyo we-Spirali-friction adhesion theory ngoku yamkelwe ngokubanzi, kwi-static friction, indawo yoqhagamshelwano yokwenene ilingana nomthwalo.Kwaye xa ukukhuhlana sliding, kufuneka siqwalasele ubukho amandla ukucheba, ngoko, ukwandisa spiral steel lokwenene indawo zoqhagamshelwano iziphumo ukusuka umthwalo eqhelekileyo kunye nomthwalo ukucheba ukuya kwiziphumo ezidityanisiweyo.Kwakhona kunokuthiwa ukuba isivuno soqhagamshelwano lwenzeka, kunye noxinzelelo oluxinzelelekileyo olubangelwa ngumthwalo oqhelekileyo kunye nomthwalo we-tangential woxinzelelo lokwenziwa olubangelwa kuxinzelelo lwe-shear.

Xa umbhobho we-spiral welded ukukhuhlana emoyeni, kukho ungcoliseko lwendalo ngenxa yenwebu yomphezulu, kuyindalo ukusebenzisa i-friction phenomenon engcolisekileyo ithiyori yokuncamathela yefilimu ekhoyo ukucacisa umphezulu wesinyithi.Enyanisweni, ubuninzi bomphezulu wesinyithi buhlala bugqunywe ngefilimu ye-oxide ebhityileyo, kwaye ngenxa yoko le friction ukuya kwintsimbi yesinyithi, i-friction yefilimu ye-oxide iyifilimu ye-oxide, emva kokutshatyalaliswa kwefilimu ye-oxide kunokwenzeka kuphela ukwenza ngokuthe ngqo. intsimbi ukuya kwintsimbi.Xa umphezulu ophantsi wokukhuhlana ungcolisekile, kwaye ungcoliseko lwe-membrane yokucheba amandla, ukukhula kwe-adhesion junction akubonakali.Xa umbhobho wentsimbi ejikelezayo xa i-membrane ingcolisa uxinzelelo lwe-chear ifikelela kumandla wokucheba wongcoliseko lwefilimu yomphezulu womphezulu wanqunyulwa, ukukhuhlana kwaqala ukutyibilika.Kule meko, i-coefficient ye-adhesive friction ingabonakaliswa njenge-f = k / v apho, ngenxa yokuqina kwe-shear yefilimu yongcoliseko lomphezulu yindawo yesivuno somzimba wesinyithi.