Emapayipini egesi emvelo amabanga amade, ukusebenzisa insimbi yepayipi yezinga eliphezulu kuyindlela eyinhloko yokonga izindleko.Inkambiso yemboni yamapayipi yaseCanada ifakazele ukuthi: uma kuqhathaniswa ne-X60, ukwamukelwa kogqinsi lwamapayipi odonga lwe-X70 kungancishiswa ngo-14%;Uma kuqhathaniswa ne-X70, ukwamukelwa kogqinsi lwamapayipi angu-X80 kungancishiswa nakakhulu ngo-12.5%.Ukushisela kungenye yezixhumanisi ezibalulekile ekukhiqizweni kwamapayipi ensimbi nokwakhiwa kwamapayipi, ngenxa yomjikelezo wokushisela oshisayo ongalingani, indawo ethintekile ekushiseleni (i-HAZ) iyingxenye ebuthakathaka yepayipi.Izinga lokupholisa liyipharamitha eyinhloko yokunquma ukusebenza kwenhlangano ye-HAZ, ihlobene nokufakwa kokushisa kwe-welding, ukushuba kwe-workpiece kanye nesimo semisebe ezungezile.Ngakho-ke, ukwenza inqubo yokushisela enengqondo, ijubane lokupholisa le-welding lingathola ukusebenza okuhle kakhulu kwenhlangano ye-HAZ, gwema imifantu ye-HAZ, ukuze kuqinisekiswe ukusebenza kokuphepha kwepayipi.

Ngokukhuphuka kwezinga lokupholisa, i-microstructure ye-X80 yensimbi yepayipi ye-HAZ inikezwa kuqala nge-polygonal ferrite, ukubeka kuqala ngo-B noma uhlamvu lwe-lath martensite, ubulukhuni buzokhula.Uma okokufaka kokushisa kwe-welding kukukhulu kakhulu noma izinga lokushisa langaphambi kokushisa liphezulu kakhulu futhi isivinini sokupholisa singaphansi kuka-2℃/ s, Inhlangano ye-X80 yensimbi yepayipi ye-HAZ inikezwa kuqala ngezinhlamvu ze-polygon ferrite noma ze-B polygon, kodwa ngenxa yokuba khona kwebhulokhi ye-pearlite ne-MA yeqembu lesiqhingi, okuholela ekusebenzeni komthelela wekristalu emaholoholo kubi kakhulu.Uma okokufaka kokushisa kwe-welding kukuncane kakhulu noma izinga lokushisa langaphambi kokushisa liphansi kakhulu futhi isivinini sokupholisa sikhulu kuno-30℃/ s, Inhlangano ye-X80 yepayipi yensimbi ye-HAZ inikezwa kuqala nge-BF noma i-lamellar martensite, okuholela ekwehleni kokusebenza komthelela wekristalu emahhadla.Ukwenza inqubo yokushisela enengqondo, ukulawula izinga lokupholisa ngaphakathi kobubanzi obungu-2 ~ 30℃/ s, Inhlangano ye-X80 yamapayipi ensimbi ye-HAZ inikezwa kuqala ku-B, iqembu lesiqhingi se-MA lihlakazekile, indawo yokusanhlamvu eqinile inobulukhuni obufanele nokusebenza komthelela omuhle kakhulu.