Preheating ke ts'ebetso e mahlonoko ho mechini ea welding ea butt e kenyelletsang ho phahamisa mocheso oa tšepe ea motheo pele o qala ts'ebetso ea welding. Ho utloisisa morero le melemo ea ho futhumatsa pele ho bohlokoa bakeng sa li-welders le litsebi tsa indasteri ea li-welding. Sengoliloeng sena se hlahloba bohlokoa ba ho futhumatsa pele mochining oa welding oa butt, ho totobatsa karolo ea ona ho netefatsa hore li-welds tse atlehileng le ho khothaletsa boleng ba weld.
- Tlhaloso ea Preheating: Preheating e kenyelletsa ho futhumatsa tšepe ea motheo ho mocheso o itseng pele ho welding. Thempereichara ea preheating e khethoa ho ipapisitse le mofuta oa thepa, botenya, moralo o kopaneng le ts'ebetso ea welding.
- Thibelo ea ho Petsoha: E 'ngoe ea merero ea mantlha ea ho futhumatsa pele ke ho thibela ho phatloha ha lenonyeletso la weld. Ho futhumatsa ho fokotsa mocheso pakeng tsa sebaka sa weld le tšepe ea motheo e potolohileng, ho fokotsa kotsi ea ho phatloha ho bakoang ke hydrogen le ho phatloha ho batang.
- Khatello ea Maikutlo: Preheating e boetse e fana ka phomolo ea khatello ea kelello ho tšepe ea motheo. E thusa ho fokotsa khatello ea maikutlo e ka hare e bakoang ke ts'ebetso ea welding, ho fokotsa monyetla oa ho khopama le khatello e setseng ho weld ea ho qetela.
- Matla a Ntlafetseng a Weld: Ka ho futhumatsa tšepe ea motheo pele, lenonyeletso la weld le fumana ho tiea ho ntlafetseng le ductility. Sena se lebisa ho li-welds tse nang le ts'ebetso e phahameng ea ho hanyetsa le ho ntlafatsa thepa ea mochini ka kakaretso.
- Phokotso ea Hydrogen Embrittlement: Preheating e thusa ho fokotsa hydrogen embrittlement, e leng ketsahalo moo liathomo tsa haedrojene li kenellang ka har'a tšepe ea weld, e etsang hore e be brittle. Mocheso o phahameng nakong ea preheating o thusa ho baleha ha hydrogen, ho fokotsa kotsi ea embrittlement.
- Ho kenella ha Weld ho Betere: Lithuso tsa ho futhumatsa pele ho fihlella ho kenella ho betere ha weld, haholo lisebelisoa tse teteaneng. Mocheso o phahameng o nolofatsa tšepe ea motheo, e leng ho nolofalletsang ts'ebetso ea welding hore e kenelle ka lenonyeletso.
- Ho netefatsa Fusion e Nepahetseng: Preheating e khothalletsa fusion e nepahetseng pakeng tsa tšepe ea weld le tšepe ea motheo. Sena se bohlokoa haholo ha o sebetsa ka litšepe tse phahameng tsa alloy le lisebelisoa tse ling tse atisang ho baka fusion e mpe.
- Ho Fokotsa Sebaka se Ametsoeng ke Mocheso (HAZ): Ho futhumatsa pele ho thusa ho laola boholo ba sebaka se anngoeng ke mocheso (HAZ) nakong ea ho cheselletsa. HAZ e nyane e fokotsa kotsi ea liphetoho tsa metallurgic ka tšepe ea motheo, ho boloka thepa ea eona ea pele.
Qetellong, ho futhumatsa pele ho phetha karolo ea bohlokoa mechineng ea ho cheselletsa butt ka ho lokisa tšepe ea motheo bakeng sa ho cheselletsa le ho netefatsa hore li-welds li atleha. Ts'ebetso e thibela ho phunyeha, e fana ka phomolo ea khatello ea kelello, e ntlafatsa ho tiea ha weld, e fokotsa hydrogen embrittlement, e ntlafatsa ho kenella ha weld, e khothalletsa ho kopanya hantle, le ho fokotsa sebaka se amehileng ke mocheso. Ka ho kenya ts'ebetsong ka hloko mekhoa ea ho futhumatsa e thehiloeng ho litlhaloso tsa thepa le mekhoa ea ho cheselletsa, li-welders le litsebi li ka finyella li-welds tsa boleng bo phahameng tse nang le thepa e phahameng ea mochine. Ho totobatsa bohlokoa ba ho futhumatsa pele ho kenya letsoho ntlafatsong ea ts'ebetso ea ho tjheseletsa butt, ho matlafatsa ts'ebetso ea tšepe e bolokehileng le e tšepahalang lits'ebetsong le liindastering tse fapaneng.
Nako ea poso: Jul-26-2023
