Kɔnɔna degun min bɛ to sen na welding ni nɛnɛ dafalen kɔfɛ, o bɛ wele ko welding residual stress. welding residual stress bɛ jate nin cogo la:
1. Ka kɛɲɛ ni degun sababu ye .
(1) Sumaya degun: Sogo ye funteni ni nɛnɛ kɛcogo ye min tɛ kelen ye. Degun min bɛ welda kɔnɔ, o bɛ sɔrɔ kɛrɛnkɛrɛnnenya la funteni ni funteni danfara fɛ, o min bɛ wele ko degun funteni, n’a bɛ fɔ fana ko funteni degun.
(2) degun min bɛ mɔgɔ minɛ: Degun min bɛ sɔrɔ kosɛbɛ sigicogo yɛrɛ fɛ walima kɛnɛma kunbɛncogo fɛ, o bɛ wele ko degun min bɛ mɔgɔ minɛ.
(3) Fasa jiginni degun : Degun min bɛ sɔrɔ kɛrɛnkɛrɛnnenya la microstructure weldalen yɔrɔ la, o bɛ wele ko fase jiginni degun, o bɛ wele fana ko microstructure stress.
(4) Degun caman sɔrɔli idɔrɔzi fɛ: degun min bɛ sɔrɔ kɛrɛnkɛrɛnnenya la, o bɛ sɔrɔ hidrɔzɛni jɛnsɛnnen dalajɛli fɛ mikoroskɔpi nafama na, o bɛ wele ko degun camanba min bɛ sɔrɔ hidrɔzɛni fɛ.
Nin degun tolen naani ninnu na, funteni degun de bɛ fanga sɔrɔ. O la, ka kɛɲɛ ni degun sababuw ye, a bɛ se ka tila kulu fila ye: degun sumayalen (Temperature stress) ani fasa jiginni degun (tissue stress).
2. Ka kɛɲɛ ni degun sira ye sankolo la .
A bɛ se ka tila-tila ka kɛ sira kelen degun ye, ka degun sira fila sɔrɔ ani ka sira saba degun .
(1) Degun kelen min bɛ sira kelen fɛ: Degun min bɛ sira kelen fɛ welda la, o bɛ wele ko degun kelen, n’a bɛ fɔ fana ko layini degun. Misali la, welda sɛbɛnw ni degun minnu bɛ sɔrɔ ni u bɛ bɔ welda la, olu ka weldaw bɛ sɔrɔ.
(2) Sirectional stress: Degun min bɛ kɛ sira fila kan minnu bɛ ɲɔgɔn kan, o bɛ wele ko degun fila, n’a bɛ fɔ fana ko plan stress. A ka c’a la, a bɛ sɔrɔ weldalenw na minnu bɛ kɛ ni tasa cɛmancɛ ni girinmanw ye minnu janya ye milimɛtɛrɛ 15-20 ye.
(3) Sira saba degun: Degun min bɛ kɛ sira saba fɛ, o bɛ jɔ ɲɔgɔn kan welda la, o bɛ wele ko sira saba degun, o bɛ wele fana ko degun hakɛ. Misali la, degun min bɛ sɔrɔ welded thick thick thick weld ni weldaw cɛtigɛyɔrɔ la, o bɛ kɛ sira saba fɛ, o bɛ bɛn ɲɔgɔn ma.
Nɛgɛ ka bonya ni a ka sɔgɔli ni a sumayalen don ani ka nɛnɛ, o bɛ sira saba fɛ, o la, a bɛ fɔ kosɛbɛ, degun tolen min bɛ sɔrɔ welda la, o ye sira saba degun ye tuma bɛɛ. Nka ni degun nafa min bɛ sira kelen walima fila la, o ka dɔgɔ kosɛbɛ, wa a bɛ se ka jate, a bɛ se ka jate degun fila ye walima degun sira kelen fɛ, ani ni sanfɛla in ye welding residual stress suguya ye.
Pibilikiw dilanni taabolo la, nɛgɛmugu ka kan ka bɔ kɛnɛ kan, ka a kɔrɔta, ka dilan ani ka sɔgɔ. Siga t’a la, degun bɛna kɛ o waati kɔnɔ. Walasa ka izini welda pibilikiw sɔrɔ ni baara kɛcogo ɲuman ye, o degunw ka kan ka ban. O waati kelen na, ka jateminɛ kɛ musaka tansiyɔn kuntaalajan na, a ka kan ka fɛɛrɛ ɲuman ni fanga dɔgɔyali sɔrɔ. Hangao Tech (Seko masinw) . Tubu kelen-kelen min bɛ fanga mara, o bɛ se ka degun min sɔrɔ tuubu weldalenw dilanni senfɛ, olu bɔ dɔrɔn, nka fanga dɔgɔyali ni sigida lakanani fana bɛ u la. Ni an ye a suma ni o ɲɔgɔnna fɛnw ye, fanga baarakɛcogo ɲuman bɛ caya 20%-30%. Jibolisira min bɛ nɛnɛ, o bɛ se ka ji nafolo lasegincogo dɔn ani ka musaka kuntaalajanw kunbɛn ka ɲɛ.
