Unyango lwe-Dehydrogenation, olukwabizwa ngokuba lunyango lobushushu lwe-dehydrogenation, okanye unyango lobushushu lwasemva kwe-weld.
Injongo yonyango lwe-post-heat yommandla we-weld ngokukhawuleza emva kwe-welding kukunciphisa ubunzima bendawo ye-weld, okanye ukususa izinto ezinobungozi ezifana ne-hydrogen kwindawo ye-weld. Kule nkalo, unyango lwe-post-heat kunye ne-post-weld heat treatment lunempembelelo efanayo.
Emva kwe-welding, ubushushu bunciphisa izinga lokupholisa lomthungo we-weld kunye ne-weld joint ukukhuthaza ukuphuma kwe-hydrogen kunye nokuphepha ukwanda kobulukhuni.
(1) Emva kokufudumeza ngenjongo yokuphucula ukusebenza komdibaniso odibeneyo kunye nokunciphisa ubulukhuni bayo kunokusebenza kuphela xa indawo ye-welding isekwiqondo lokushisa eliphezulu emva kwe-welding.
(2) Afterheating ukuthintela iintanda ubushushu obuphantsi ikakhulu ukukhuthaza ukususwa ngokwaneleyo amandla hydrogen kwindawo welding.
Ukususwa kwe-hydrogen kuxhomekeke kwiqondo lokushisa kunye nexesha lokubamba emva kokufudumeza. Iqondo lokushisa kwinjongo ephambili yokupheliswa kwe-hydrogen ngokuqhelekileyo yi-200-300 degrees, kwaye ixesha lokufudumeza liyi-0.5-1 iyure.
Kwi-welds kwezi meko zilandelayo, unyango lwe-post-thermal hydrogen ekupheliseni kufuneka lwenziwe ngokukhawuleza emva kwe-welding (iingongoma ezi-4):
(1) Ukutyeba okukhulu kune-32mm, kunye nemathiriyeli yokuqina amandla okuqina σb>540MPa;
(2) Izinto zentsimbi eziphantsi kwe-alloy ezinobukhulu obungaphezu kwe-38mm;
(3) I-butt weld phakathi kwe-nozzle edibeneyo kunye nesitya soxinzelelo;
(4) Uvavanyo lwenkqubo ye-Welding lumisela ukuba unyango lokuphelisa i-hydrogen luyafuneka.
Ixabiso lobushushu obusemva kobushushu lidla ngokubonakaliswa ngale fomyula ilandelayo:
Tp＝455.5[Ceq]p－111.4
Kwifomula, Tp——post-heating lobushushu ℃;
[Ceq]p——Ifomula elinganayo yeCarbon.
[Ceq]p=C+0.2033Mn+0.0473Cr+0.1228Mo+0.0292Ni+0.0359Cu+0.0792Si－1.595P+1.692S+0.844V
Ukunciphisa umxholo we-hydrogen kwi-weld zone yenye yeempembelelo ezibalulekileyo zonyango lwe-post heat. Ngokweengxelo, kwi-298K, inkqubo ye-hydrogen diffusion ukusuka kwi-low carbon steel welds yi-1.5 kwiinyanga ezi-2.
Xa ubushushu bonyuswa ukuya kwi-320K, le nkqubo inokucuthwa ibe yi-2 ukuya kwe-3 imini nobusuku, kwaye emva kokufudumeza ukuya kwi-470K, ithatha iiyure ezili-10 ukuya kwezi-15.
Umsebenzi oyintloko wokunyanga kwe-post-heat kunye ne-dehydrogenation kukuthintela ukubunjwa kwamaqhekeza abandayo kwi-weld metal okanye kwindawo echaphazelekayo ukushisa.
Xa ukufudumeza kwe-weldment phambi kokuba i-welding akwanelanga ukuthintela ukubunjwa kweentanda ezibandayo, ezifana ne-welding ye-high-contraindication joints kunye nentsimbi enzima-i-weld, inkqubo yokutshisa emva kokufudumala kufuneka isetyenziswe ukukhusela ngokuthembekileyo ukubunjwa. yeentanda ezibandayo.
Ixesha lokuposa: Mar-29-2023
