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 gbagbãƒewo dzena. Tsitsi ƒe sesẽƒe kple nukuwo ƒe ƒuƒu aɖeke meli le welded joint me o, eyata weld ƒe tensile strength la lolo wu.
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 .
1. Chromium carbide ƒe wɔwɔme ɖea ŋutete si le welded joints ŋu 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 dzidzenu siwo gbɔna atsɔ aɖo seɖoƒe na xɔxlɔ̃ si le weld seam kple sensitization dzoxɔxɔ ƒe akpa si le nusi woɖo taɖodzinu na dzi:
a. Ðe carbon ƒe agbɔsɔsɔ si le gɔmeɖoanyi ga kple welds me dzi kpɔtɔ, tsɔ nusiwo li ke TI, NB kple nu bubuwo kpe 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 ??Woateŋu aɖe nuku ƒe liƒo 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 pass argon 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. Le welding megbe la, wɔ solution dɔdamɔnu alo stabilization annealing (850 s 900°C) kple ya ƒe fafa be carbides la nado eye chromium ƒe kaka kabakaba).
(2) ƒunukpeƒe siwo wotsɔ ga wɔe 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, aɖee ɖe vovo le nuku ƒe liƒo dzi 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 na ƒunukpeƒe si wotsɔ ga ƒo ƒui la le dzoxɔxɔ ƒe didime si le sensitization me la, carbon si sɔ gbɔ wu la aƒu kplakplakpla 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 seselelãme ƒe ŋusẽkpɔɖeamedzi 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 awɔ eŋudɔ o la, ele be woatrɔ asi le welding specification kple weld ƒe nɔnɔme ŋu be woaƒo 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.
2. Nuteɖeamedzi ƒe xɔxlɔ̃ ƒe gbagbã .
Woate ŋu azã dzidzenu siwo gbɔna atsɔ axe mɔ ɖe nuteɖeamedzi ƒe xɔxlɔ̃ ƒe gbagbã 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. Wɔ dzoxɔxɔ si woatsɔ aɖe nuteɖeamedzi dzi akpɔtɔ le weld megbe, eye nàzã mɔ̃ɖaŋununya ƒe mɔnuwo abe polishing, shot peening kple hammering ene atsɔ aɖe stress residual stress dzi akpɔtɔ.
C. xɔtuɖoɖo ƒe ɖoɖowɔwɔ si me susu le. Be woaƒo asa na nuteɖeamedzi gãwo ƒe susu tsɔtsɔ ɖe nu ŋu.
3. Welding hot cracks (crystallization cracks le welds, liquefaction cracks le dzoxɔxɔ-affected zone)
Dzoxɔxɔ ƒe gbagbã ƒe seselelãme nɔ te ɖe atike ƒe wɔwɔme, ɖoɖowɔwɔ kple nusi wotsɔ wɔe ƒe dɔwɔwɔ dzi koŋ. NI le bɔbɔe be woawɔ nusiwo me melting point compounds alo eutectic le kple ɖiƒoƒo abe S kple P. Boron kple silicon ƒe vovototodedeameme ana dzoxɔxɔ ƒe ʋuʋu nado ɖe ŋgɔ. Weld la le bɔbɔe be woawɔ coarse corsear crystal structure si me mɔfiame sẽŋu le, si sɔ na ɖiƒoƒo kple nusiwo gblẽa nu le ame ŋu ƒe vovototodedeameme. Esia doa tsi film si me tsi le si me tsi mele o si yia edzi la wɔwɔ ɖe ŋgɔ eye wònaa dzoxɔxɔ ƒe gbagbã ƒe seselelãme nyona ɖe edzi. Ne dzoxɔxɔ si wotsɔ wɔa xɔa me la mexɔ dzo ɖekae o la, ele bɔbɔe be woawɔ tensile stress si lolo wu eye woado welding hot cracks ƒe dzidzime ɖe ŋgɔ.
Afɔɖeɖe siwo woawɔ atsɔ axe mɔ ɖe enu:
a. Kpɔ ŋusẽ ɖe ɖiƒoƒo siwo gblẽa nu le ame ŋu ƒe nyawo dzi vevie s kple P.
b. Trɔ asi le weld ga ƒe wɔwɔme ŋu. Dual-phase structure weld la ƒe crack resistance nyo. Delta ƒe akpa si le weld me ateŋu atrɔ asi le nukuawo ŋu, aɖe austenite si ƒe akpa ɖeka ƒe akpa ɖeka ƒe mɔfiame ɖa, aɖe ɖiƒoƒo siwo gblẽa nu le nuku ƒe liƒo dzi ƒe vovototodedeameme dzi akpɔtɔ, eye delta ƒe akpaa ate ŋu aʋuʋu geɖe wu S kple P ate ŋu aɖe ƒomedodo ƒe ŋusẽ dzi akpɔtɔ eye wòawɔ ɖoɖo ɖe intergranular liquid film ƒe wɔwɔme ŋu.
C. Trɔ asi le weld ga alloy ƒe wɔwɔme ŋu. Dzi Mn, C, kple N ƒe agbɔsɔsɔ ɖe edzi nyuie le austenitic gakpo si ƒe akpa ɖeka nye phase me, eye nàtsɔ nu sue aɖewo abe cerium, pickaxe, kple tantalum (si ate ŋu atrɔ asi le weld ƒe wɔwɔme ŋu eye woakɔ nuku ƒe liƒo ŋu), si ate ŋu aɖe dzoxɔxɔ ƒe gbagbã ƒe seselelãme dzi akpɔtɔ.
d. Dɔwɔwɔ ƒe afɔɖeɖewo. Ðe tsita si wotsɔ ƒoe la ƒe dzoxɔxɔ fũ akpa dzi kpɔtɔ be wòaxe mɔ na sɔti siwo le abe sɔti ene siwo le ʋeʋẽm la ƒe wɔwɔme. Zã dzoxɔxɔ sue aɖe kple cross-section weld beads suewo.
Le kpɔɖeŋu me, austenitic gakpo 25-20 nyea tsi si me tsi le bɔbɔe. Ate ŋu adzɔ be woaɖo seɖoƒe na ɖiƒoƒo ƒe agbɔsɔsɔ kple nuku ƒe lolome si le gɔmeɖoanyinu la ŋu vevie, axɔ ŋusẽ ƒe agbɔsɔsɔ gã ƒe welding mɔnuwo, dzoxɔxɔ sue aɖe ƒe gege ɖe eme eye woadzi ƒunukpeƒeawo ƒe fafa ƒe agbɔsɔsɔ ɖe edzi.
4. Wotsɔ ga si wotsɔ ga wɔe la ƒe ʋuʋu .
Ele be gakpo si ŋu dzoxɔxɔ le nakpɔ egbɔ be ƒunukpeƒe siwo wotsɔ ga ƒo ƒui la ƒe plasticity be woaxe mɔ ɖe dzoxɔxɔ si nu sẽ nu; Wobia tso gakpo siwo ƒe dzoxɔxɔ mede o si be woƒe sesẽ nyui si me dzoxɔxɔ mele o nanɔ wo ŋu be woaxe mɔ ɖe ƒunukpeƒe siwo wotsɔ ga wɔe ƒe gbagbã si me dzoxɔxɔ mele o nu.
5. WELDING GÃ GBÃTƆ .
Le dzoxɔxɔ ƒe tsɔtsɔme si bɔbɔ kple kekeɖenudɔwɔwɔ gã ta la, welding deformation lolo, eye woate ŋu azã clamps atsɔ axe mɔ ɖe deformation nu.
Ne kuxi siwo míeyɔ ɖe etame hã le ŋuwò la, àte ŋu adzro nudzɔdzɔa me ne èlé ŋku ɖe pɔmpi ƒe welding ƒe ɖoɖoa ŋu. Emegbe nàwɔ afɔɖeɖe siwo sɔ atsɔ akpɔ kuxia gbɔ le nɔnɔme si sɔ kplii nu. Tsɔ kpe ɖe nusi le nusi le nusi ŋutɔ me ŋutɔ ŋu la, aŋɔa, aɖakaʋuawo mama, welding current, kple welding speed of the welded pipe unit akpɔ ŋusẽ aɖe ɖe welded pipe ƒe nyonyome dzi. abe alesi wòle ene . Professional manufacturing of industrial welded pipe production equipment , nyuie be nàɖo dze kple Hangao Tech . ku ɖe kuxi siwo nèdoa goe le austenitic welded pɔmpiwo wɔwɔ me, eye nàkpɔ mɔ be yeawɔ ŋgɔyiyi kpli wò.
