Woate ŋu ama gakpo si mexɔ dzo o ɖe hatsotso ene me le eƒe gakpo ƒe wɔwɔme nu, si nye, austenitic gakpo si mexɔ dzo o, ferritic gakpo si mexɔ dzo o, Martensitic gakpo si mexɔ dzo o, kple austenitic-ferritic duplex gakpo si mexɔ dzo o. Nusiwo gbɔna la ku ɖe austenitic gakpo si mexɔ dzo o kple gakpo si mexɔ dzo o si le mɔ eve nu ƒe ƒoƒo ƒe nɔnɔmewo ŋu koŋ.
(1) Ga si mexɔ dzo o si nye austenitic .
Austenitic gakpo si mexɔ dzo o la le bɔbɔe be woatsɔ aƒoe wu gakpo bubu siwo mexɔ dzo o. Akpa ƒe tɔtrɔ aɖeke medzɔna le dzoxɔxɔ aɖeke me o, eye mesea veve ɖe haidrodzin ƒe embrittlement nu o. Austenitic gakpo si mexɔ dzo o ƒe ƒunukpeƒewo hã ƒe plasticity kple sesẽ nyuie wu le welded nɔnɔme me. Kuxi vevi siwo le welding mee nye: welding hot cracking, embrittlement, intergranular corrosion kple stress corrosion. Tsɔ kpe ɖe eŋu la, le dzoxɔxɔ ƒe tsɔtsɔme manyomanyo, linear expansion coefficient gã, welding stress gã kple deformation ta. Ne wole welding la, ele be dzoxɔxɔ si woatsɔ awɔ welding la nanɔ sue alesi woate ŋui, eye mele be woado dzoe do ŋgɔ o, eye woaɖe dzoxɔxɔ si le wo nɔewo dome la dzi akpɔtɔ. Ele be woakpɔ dzoxɔxɔ si le ƒuƒoƒo si le wo nɔewo dome dzi le 60°C te, eye ele be woatsɔ weld ƒe ƒuƒoƒoawo aɖo wo nɔewo ŋu. Be woaɖe dzoxɔxɔ si le eme dzi akpɔtɔ la, mele be woadzi welding ƒe duƒuƒu ɖe edzi wòagbɔ eme o, ke boŋ ele be woatrɔ asi le eŋu be wòaɖe welding current dzi akpɔtɔ.
(2) austenitic-ferritic eve-fase gakpo si mexɔ dzo o ƒe ƒoƒo .
Austenitic-Ferritic Bidirectional Stainless Steel nye gakpo si mexɔ dzo o si me austenite kple ferrite le. Eƒoa austenitic gakpo kple ferritic gakpo ƒe viɖewo nu ƒu, eyata eƒe nɔnɔmewo nye ŋusẽ gã, corrosion tsitretsitsi nyui kple welding bɔbɔe. Fifia la, gakpo siwo mexɔ dzo o ƒe akpa eve koŋue li: CR18, CR21, kple CR25. Nu vevi siwo le gakpo sia ƒomevi ŋue nye: Ne wotsɔe sɔ kple austenitic stainless steel la, dzoxɔxɔ ƒe nɔnɔme si le esi la le ʋɛ wu; Ne wotsɔe sɔ kple ferritic gakpo dzadzɛ si mexɔ dzo o la, eƒe nɔnɔme le ʋɛ wu be woatsɔe ade dzoe le welding megbe, eye ferrite ƒe ʋeʋẽ ƒe agbɔsɔsɔ le dzoxɔxɔ ƒe nuto si me welding le hã me la le ʋɛ wu, eyata weldability la nyo wu.
Le gakpo sia ƒomevi ƒe welding ƒe dɔwɔwɔ nyuie ta la, dzoxɔxɔ do ŋgɔ kple dzoxɔxɔ megbe mehiã le welding me o. Ele be woatsɔ TIG aƒo agba tsɛwo nu ƒu, eye woate ŋu atsɔ elektrikŋusẽ si le titina kple esiwo le ʋeʋẽm la aƒo wo nu ƒu. Ele be woatia electrode tɔxɛ si ƒe wɔwɔme sɔ kple base metal alo austenitic electrode si me carbon mesɔ gbɔ ɖo o la na electrode arc welding. Woate ŋu azã nickel-based alloy electrodes hã na CR25 dual-phase gakpo.
Le ferrite ƒe akpa gã aɖe ƒe anyinɔnɔ le dual-phase steels me ta la, ferritic steels ƒe dzɔdzɔmeŋusẽ si le dzɔdzɔme nu, abe brittleness le 475°C, σ phase precipitation embrittlement kple coarse grains ene ate ŋu anɔ anyi na austenite ƒe anyinɔnɔ kokoko. Ne wole xɔ eve siwo mexɔ dzo o siwo me NI alo Ni si le sue aɖeke mele o la ƒom la, ferrite si ƒe akpa ɖeka nye phase kple nukuwo ƒe ƒuƒuiƒe ƒe nɔnɔme le teƒe si dzoxɔxɔ le. Le ɣeyiɣi sia me la, ele be woalé ŋku ɖe dzoxɔxɔ si wotsɔ ƒoa welding la ŋu, eye woadze agbagba azã elektrikŋusẽ si le sue, welding ƒe duƒuƒu si kɔkɔ, kple mɔ gbadza si wotsɔna ƒoa ʋuƒoe. kple multi-pass welding be woatsɔ axe mɔ ɖe nukuwo ƒe ƒuƒu kple phase ferrite si ƒe akpa ɖeka le teƒe si dzoxɔxɔ le la nu la, mele be dzoxɔxɔ si le ƒuƒoƒoawo dome nakɔ akpa o, eye anyo wu be woatsɔ weld si kplɔe ɖo le vuvɔ megbe.
Nusiwo míegblɔ va yi la dometɔ evea siaa nye ƒomevi siwo ŋu woate ŋu aƒo wo ɖo bɔbɔe. Gake gakpo siwo mexɔ dzo o hã li siwo me womate ŋu awɔ dɔ le o, abe ferrite ene. Le ɣeyiɣi sia me la, míele aɖaŋu ɖom na wò be nàbu míaƒe patented welding kpeɖeŋutɔ dɔwɔnu- .Elektrikŋusẽ ƒe dziɖuɖu ƒe akasanu ƒe mɔ̃ .. Hangao Tech (Seko mɔ̃wo) ƒo nuteƒekpɔkpɔ kple nyatakakawo nu ƒu le welded pɔmpi wɔwɔ dɔwɔnuwo dɔwɔƒe le ƒe 20 siwo va yi me, ale be togbɔ be welding duƒuƒu nyo ɖe edzi hã la, ateŋu abu weld ƒe nyonyome hã ŋu. Woka ɖe weld la ƒe nyonyome dzi, eye ne welded pipe la ge ɖe dɔwɔwɔ si kplɔe ɖo me hena dɔwɔwɔ la, woate ŋu aɖe scrap rate dzi akpɔtɔ nyuie eye woate ŋu adzi nusi wowɔ ɖe edzi.
