Ukwelashwa kwe-dehydrogenation, okwaziwa nangokuthi ukwelashwa kwe-dehydrogenation ukushisa, noma ukwelashwa kokushisa kwangemuva kwe-weld.
Inhloso yokwelashwa kwangemuva kokushisa kwendawo yokushisela ngokushesha ngemva kokushisela ukunciphisa ubulukhuni bendawo yokushisela, noma ukususa izinto eziyingozi njenge-hydrogen endaweni yokushisela. Kulokhu, ukwelashwa kokushisa ngemuva kokushisa kanye nokwelashwa kokushisa kwe-post-weld kunomphumela ofanayo oyingxenye.
Ngemva kokushisela, ukushisa kunciphisa izinga lokupholisa le-weld seam kanye nejoyinti elishiselwe ukukhuthaza ukuphuma kwe-hydrogen futhi kugwenywe ukwanda kokuqina.
(1) Ngemva kokushisa ngenjongo yokuthuthukisa ukusebenza kwejoyinti elishiselwe kanye nokunciphisa ubulukhuni balo kungasebenza kuphela lapho indawo yokushisela isesezingeni eliphezulu lokushisa ngemva kokushisela.
(2) Ukushisa ngemva kokushisa ukuze kuvinjwe imifantu enezinga lokushisa eliphansi ngokuyinhloko ukukhuthaza ukususwa okwanele kwamandla e-hydrogen endaweni yokushisela.
Ukususwa kwe-hydrogen kuncike ekushiseni nasekubambeni isikhathi sokushisa kwangemva kokushisa. Izinga lokushisa ngenjongo eyinhloko yokuqedwa kwe-hydrogen ngokuvamile lingama-degree angu-200-300, kanti isikhathi sokushisa ngemva kwehora yi-0.5-1.
Ukuze uthole ama-welds ezimweni ezilandelayo, ukwelashwa kwe-post-thermal hydrogen yokuqeda kufanele kwenziwe ngokushesha ngemva kokushisela (amaphuzu angu-4):
(1) Ubukhulu obukhulu kuno-32mm, namandla okubamba ajwayelekile σb>540MPa;
(2) Izinto zensimbi ezinengxubevange ephansi ezinogqinsi olungaphezu kuka-38mm;
(3) I-butt weld phakathi kwe-nozzle eshumekiwe nomkhumbi wokucindezela;
(4) Ukuhlolwa kwenqubo yokushisela kunquma ukuthi kudingeka ukwelashwa kokuqedwa kwe-hydrogen.
Inani lokushisa kwangemva kokushisa livame ukuvezwa ngefomula elandelayo:
Tp＝455.5[Ceq]p－111.4
Kufomula, Tp——izinga lokushisa langemuva kokushisa ℃;
[Ceq]p——Ifomula elilingana nekhabhoni.
[Ceq]p=C+0.2033Mn+0.0473Cr+0.1228Mo+0.0292Ni+0.0359Cu+0.0792Si－1.595P+1.692S+0.844V
Ukunciphisa okuqukethwe kwe-hydrogen endaweni yokushisela kungomunye wemiphumela ebalulekile yokwelashwa kokushisa kwangemuva. Ngokwemibiko, ku-298K, inqubo yokusabalalisa i-hydrogen kusuka ku-low carbon steel welds yizinyanga ezingu-1.5 kuya kwezi-2.
Uma izinga lokushisa linyuswa libe ngu-320K, le nqubo ingafushaniswa ibe yizinsuku ezi-2 kuya kwezingu-3 nobusuku, futhi ngemva kokushisa ku-470K, ithatha amahora angu-10 kuya kwangu-15.
Umsebenzi oyinhloko wokwelashwa kwe-post-heat kanye ne-dehydrogenation ukuvimbela ukwakheka kwemifantu ebandayo ensimbi ye-weld noma endaweni ethintekile ukushisa.
Lapho ukushisa kwe-weldment ngaphambi kwe-welding akwanele ukuvimbela ukwakheka kwemifantu ebandayo, njengokushiswa kwamajoyinti aphezulu kanye nezinsimbi ezinzima zokushisela, inqubo yokushisa ngemuva kokushisa kufanele isetshenziselwe ukuvimbela ngokuthembekile ukwakheka. kwemifantu ebandayo.
Isikhathi sokuthumela: Mar-29-2023
