Austenitic gakpo si mexɔ dzo o ƒe welding ƒe nɔnɔmewo: Elastic kple plastic stress kple strain le welding ƒe ɖoɖoa me lolo ŋutɔ, gake ƒã hafi wokpɔa gbagbãƒe siwo fa miamiamia. Senching hardening zone kple grain coansening aɖeke mele weld la me o, eyata weld la ƒe tensile strength la sɔ gbɔ vie.
kuxi vevi siwo le austenitic gakpo si mexɔ dzo o ƒe welding: welding deformation gã; Le eƒe nukuwo ƒe liƒo ƒe nɔnɔmewo kple seselelãme ɖe ɖiƒoƒo aɖewo siwo le sue (S, p) ŋu ta la, ele bɔbɔe be woawɔ ʋuʋudedi dzodzoewo.
Atɔ̃ gã welding kuxi kple atikewɔwɔ dzidzenuwo austenitic gakpo si mexɔ dzo o .
01 Chromium carbide ƒe wɔwɔme ɖea ŋutete si le weld la si be wòatsi tre ɖe intergranular corrosion ŋu dzi kpɔtɔna.
Intergranular corrosion: Le chromium ƒe vɔvɔ ŋuti nufiafia nu la, chromium carbide ƒua gbe ɖe nuku ƒe liƒowo dzi ne wodo dzo weld kple dzoxɔxɔ si ŋu dzoxɔxɔ le ƒe akpaa yi sensitization dzoxɔxɔ ƒe akpa si nye 450-850 °C, si na chrochum-gbe ƒe liƒowo me gblẽ.
(1) Woate ŋu azã afɔɖeɖe siwo gbɔna atsɔ aɖo seɖoƒe na xɔxlɔ̃ si le weld seam kple corrosion si le sensitization dzoxɔxɔ ƒe akpa si le nusi woɖo taɖodzinu na dzi:
a. Ðe carbon ƒe agbɔsɔsɔ si le gɔmeɖoanyi ga kple weld me dzi kpɔtɔ, eye nàtsɔ nusiwo li ke si nye Ti, NB kple nu bubuwo akpe ɖe gɔmeɖoanyi ga la ŋu be woatsɔ aɖo nɔƒe gbãtɔ na MC ƒe wɔwɔ be woaƒo asa na CR23C6 ƒe wɔwɔ.
b. Na weld la nanye austenite ƒe akpa eve ƒe wɔwɔme kple ferrite sue aɖe. Ne ferrite agbɔsɔsɔme aɖe le weld la me la, woate ŋu atrɔ asi le nukuawo ŋu, woate ŋu adzi nukuawo ƒe lolome ɖe edzi, eye chromium carbide ƒe tsidzadza le nuto ɖeka me le nuku ƒe liƒo dzi dzi akpɔtɔ.
Chromium nyea nusi me wodea amii ŋutɔ le ferrite me. Cr23C6 nyea nusi wowɔna wu le ferrite me evɔ menaa austenite nukuwo ƒe liƒowo dzi ɖena kpɔtɔna le chromium me o; Ferrite si kaka ɖe austenitewo dome ate ŋu axe mɔ na nutete le nukua ƒe liƒo dzi ayi ɖe eme ƒe kaka me.
C. Kpɔ ɣeyiɣi si woatsɔ anɔ anyi le dzoxɔxɔ ƒe dzoxɔxɔ ƒe didime me. Adjust the welding thermal cycle, shorten the residence time of 600～1000℃ as much as possible, choose a welding method with high energy density (such as plasma argon arc welding), select a smaller welding heat input, and use argon gas on the back of the weld or use a copper pad Increase the cooling rate of the welded joint, reduce the arc starting and ending times to avoid repeated heating, and the contact surface with the Ele be woatsɔ ga awɔ crerosive medium le multilayer welding me be wòanye mamlɛtɔ alesi woate ŋui.
d. Ne èƒoe vɔ la, wɔ solution treatment alo stabilization annealing (850マ900°C) kple ya ƒe fafa be carbide la nado eye chromium ƒe kaka kabakaba).
(2) weldwo ƒe xɔxlɔ̃ si le abe hɛ ene. Le susu sia ta la, woate ŋu awɔ mɔxexeɖedɔléle nu ƒe afɔɖeɖe siwo gbɔna:
Le carbon ƒe kaka ƒe ŋutete sesẽ ta la, aɖiɖi ɖe vovo le nuku ƒe liƒo me be wòawɔ nɔnɔme si sɔ gbɔ wu le fafa ƒe ɖoɖoa me, esime TI kple NB anɔ kristalo me le kaka ƒe ŋutete si bɔbɔ ta. Ne wogado dzo ɖe weld la ŋu le sensitization dzoxɔxɔ ƒe didime me la, woawɔ carbon si sɔ gbɔ wu la le CR23C6 ƒe nɔnɔme me le kristaloawo dome.
a. Ðe carbon ƒe agbɔsɔsɔ dzi kpɔtɔ. Le gakpo si mexɔ dzo o si me nusiwo li ke le gome la, mele be carbon ƒe agbɔsɔsɔ nawu 0.06% o.
b. Zã welding ƒe ɖoɖo si sɔ. Tia dzoxɔxɔ ƒe dzoxɔxɔ si le sue wu be nàɖe ɣeyiɣi si me dzoxɔxɔ si gbɔ eme ƒe nɔƒe dzi akpɔtɔ le dzoxɔxɔ gã me, eye nàlé ŋku ɖe 'medium dzoxɔxɔ ƒe sensitization' ƒe ŋusẽkpɔɖeamedzi ŋu le welding ƒe ɖoɖoa me.
Ne wole akpa eve ƒe welding, weld si do ka kple corrosive medium la, ele be woawɔ welded mamlɛtɔ (esiae nye susu si tae wowɔa welding ememe-diameter thick-wall welded pipes le gotagome welding la megbe). Ne womate ŋu awɔe o la, ele be woatrɔ asi le welding specification kple weld ƒe nɔnɔme ŋu, eye woadze agbagba aƒo asa na teƒe si xɔ dzo akpa le kadodo me kple nusi gblẽa nu la ake eye dzoxɔxɔ le eme.
C. Dzoxɔxɔ ƒe dɔwɔwɔ le weld megbe. Wɔ solution alo stabilization treatment le welding vɔ megbe.
02 Nuteɖeamedzi ƒe xɔxlɔ̃ ƒe gbagbã .
Woate ŋu azã dzidzenu siwo gbɔna atsɔ axe mɔ ɖe nuteɖeamedzi ƒe xɔxlɔ̃ ƒe gbagbã ƒe dzɔdzɔ nu:
a. Tia nuawo nyuie eye nàtrɔ asi le weld ƒe wɔwɔme ŋu le mɔ si sɔ nu. High-kɔklɔ chromium-nickel austenitic gakpo si mexɔ dzo o, kɔkɔ silicon chromium-nickel austenitic gakpo si mexɔ dzo o, ferritic-austenitic gakpo si mexɔ dzo o, high-chromium ferritic gakpo si mexɔ dzo o, kple bubuawo na stress corrosion tsitretsitsi nyuie, eye weld corrosion it has good strale corrosion is a austenitic is a austenitic is a austenitic is austenitic is austenitic is a austenitic is a austenitic is austenitic is austenitic is a austenitic is austenitic.
b. Ðe nuteɖeamedzi susɔewo ɖa alo aɖe wo dzi akpɔtɔ. Woate ŋu azãe na dzoxɔxɔ si ɖea nuteɖeamedzi dzi kpɔtɔna le welding megbe, abe A Ametakpɔnu yame le-line keklẽ dzoxɔxɔ atikewɔwɔ induction annealing dzodoƒe . si xɔ gɔmeɖose si nye dzoxɔxɔ si wotsɔna ƒoa dzoe ene. Dzodoƒe si le keklẽm si le keklẽm le . Hangao Tech (Seko mɔ̃wo) mehiã dzoxɔxɔ do ŋgɔ o, sɛkɛnd 15 koe wòxɔna hafi woate ŋu aɖo dzoxɔxɔ si sɔ nyuie gbɔ kaba. Le ɣeyiɣi ma ke me la, ya ƒe tete si de ŋgɔ wu le eŋu, si ate ŋu axe mɔ na ya ƒe tɔtrɔ nyuie le annealing me nyuie. Ga ƒe wɔwɔme ɖekae le pɔmpi si wotsɔ ga wɔe si wotsɔ ga wɔe la ŋu eye nuteɖeamedzi si le fliawo dome la nɔa sue wu. Tsɔ kpe ɖe eŋu la, mɔ̃ɖaŋununya ƒe mɔnuwo abe polishing, shot peening kple hammering hã ate ŋu aɖe nuteɖeamedzi si susɔ ɖe anyigba dzi dzi akpɔtɔ.
C. xɔtuɖoɖo ƒe ɖoɖowɔwɔ si me susu le. Be woaƒo asa na nuteɖeamedzi gãwo ƒe susu tsɔtsɔ ɖe nu ŋu.
