Malangizo Owotcherera -Kodi masitepe ochotsa hydrogen ndi chiyani

Chithandizo cha dehydrogenation, chomwe chimadziwikanso kuti dehydrogenation kutentha mankhwala, kapena post-weld kutentha kutentha.

Cholinga cha mankhwala pambuyo kutentha kwa weld dera mwamsanga pambuyo kuwotcherera ndi kuchepetsa kuuma zone weld, kapena kuchotsa zinthu zoipa monga hydrogen mu weld zone. Pachifukwa ichi, chithandizo cha kutentha pambuyo pa kutentha ndi kutentha kwa pambuyo pa weld kumakhala ndi zotsatira zofanana.

Pambuyo kuwotcherera, kutentha kumachepetsa kuzizira kwa msoko wowotcherera ndi cholumikizira chowotcherera kulimbikitsa kutuluka kwa haidrojeni ndikupewa kuchuluka kwa kuuma.

(1) Pambuyo pakuwotchera ndi cholinga chofuna kuwongolera magwiridwe antchito a cholumikizira chowotcherera ndikuchepetsa kuuma kwake kungakhale kothandiza pamene zone yowotcherera ikadali pa kutentha kwakukulu pambuyo pakuwotcherera.

(2) Afterheating kuteteza otsika-kutentha ming'alu makamaka kulimbikitsa wokwanira kuchotsa mphamvu haidrojeni mu zone kuwotcherera.

Kuchotsedwa kwa haidrojeni kumadalira kutentha ndi nthawi yogwira pambuyo pa kutentha. Kutentha kwa cholinga chachikulu cha kuchotsa haidrojeni nthawi zambiri kumakhala madigiri 200-300, ndipo nthawi yotentha ndi 0.5-1 ora.

Pazowotcherera muzochitika zotsatirazi, chithandizo chochotsa ma hydrogen pambuyo pa kutentha kuyenera kuchitika mukangowotcherera (mfundo 4):

(1) Makulidwe apamwamba kuposa 32mm, ndi mphamvu yokhazikika yakuthupi σb> 540MPa;

(2) Zida zachitsulo zotsika kwambiri zokhala ndi makulidwe akulu kuposa 38mm;

(3) Kuwotcherera matako pakati pa nozzle ophatikizidwa ndi chotengera chopondereza;

(4) Kuwunika kwa njira zowotcherera kumatsimikizira kuti chithandizo cha hydrogen chikufunika.

Mtengo wa kutentha pambuyo pa kutentha nthawi zambiri umawonetsedwa ndi njira iyi:

Tp＝455.5[Ceq]p－111.4

Mu chilinganizo, Tp——post-kutentha kutentha ℃;

[Ceq]p——Nthawi yofanana ndi kaboni.

[Ceq]p=C+0.2033Mn+0.0473Cr+0.1228Mo+0.0292Ni+0.0359Cu+0.0792Si－1.595P+1.692S+0.844V

Kuchepetsa hydrogen zili mu weld zone ndi chimodzi mwa zofunika zotsatira pambuyo kutentha mankhwala. Malinga ndi malipoti, pa 298K, njira ya hydrogen diffusion kuchokera ku low carbon steel welds ndi 1.5 kwa miyezi iwiri.

Kutentha kumawonjezeka kufika 320K, njirayi ikhoza kufupikitsidwa kukhala 2 mpaka 3 masiku ndi usiku, ndipo mutatha kutentha mpaka 470K, zimatenga maola 10 mpaka 15.

Ntchito yaikulu ya mankhwala pambuyo kutentha ndi dehydrogenation ndi kuteteza mapangidwe ozizira ming'alu mu weld zitsulo kapena m'dera kutentha anakhudzidwa.

Pamene kuwotcherera kwa kuwotcherera kusanayambe kuwotcherera sikokwanira kuteteza mapangidwe a ming'alu yozizira, monga kuwotcherera kwazitsulo zolimba kwambiri ndi zitsulo zovuta kuzimitsa, ndondomeko yowotchera pambuyo iyenera kugwiritsidwa ntchito kuti iteteze mapangidwe. wa ming'alu yozizira.