Wobetumi akyekyɛ dade a ɛnyɛ den mu ayɛ no akuw anan sɛnea ne dade nhyehyɛe te, a ɛne dade a ɛnyɛ den a ɛyɛ austenitic, ferritic stainless steel, martensitic stainless steel, ne austenitic-ferritic duplex stainless steel. Nea edidi so yi hwehwɛ welding su a ɛwɔ austenitic stainless steel ne abien-way stainless steel mu no mu titiriw.
(1) Austenitic dade a ɛnyɛ den a wɔde yɛ ade .
Austenitic stainless steel yɛ mmerɛw sɛ weld sen dade a ɛnyɛ den afoforo. Nsakrae biara nni hɔ wɔ phase nsakrae mu wɔ ɔhyew biara mu, na ɛnyɛ nea ɛyɛ mmerɛw sɛ ɛbɛhyɛ hydrogen a ɛyɛ mmerɛw no. Austenitic stainless steel joints nso wɔ plasticity ne toughness a eye wɔ welded tebea no mu. Ɔhaw titiriw a ɛwɔ welding mu ne: welding a ɛyɛ hyew a ɛpaapae, embrittlement, intergranular corrosion ne stress corrosion. Bio nso, esiane ɔhyew a ɛkɔ so yiye, linear ntrɛwmu coefficient kɛse, welding stress kɛse ne deformation nti. Sɛ welding a, ɛsɛ sɛ welding ɔhyew a ɛba no yɛ ketewaa sɛnea ɛbɛyɛ yiye, na ɛnsɛ sɛ wodi kan yɛ no hyew, na ɛsɛ sɛ wɔtew ntam a ɛwɔ ntam no so. Ɛsɛ sɛ wɔhwɛ ɔhyew a ɛwɔ ntam no so wɔ 60°C ase, na ɛsɛ sɛ wɔde weld nkwaa no hinhim. Sɛnea ɛbɛyɛ a ɔhyew a ɛba no so bɛtew no, ɛnsɛ sɛ wɔma ahoɔhare a wɔde yɛ welding no kɔ soro dodo, na mmom ɛsɛ sɛ wɔsakra no ma ɛtew welding current no so.
(2) Austenitic-ferritic dade a ɛyɛ den a ɛwɔ afã abien no ho mfonini .
Austenitic-ferritic bidirectional stainless steel yɛ dadeɛ a ɛnyɛ den a ɛyɛ austenite ne ferrite. Ɛka mfasoɔ a ɛwɔ austenitic steel ne ferritic steel so no bom, enti ɛwɔ su a ɛyɛ ahoɔden a ɛkorɔn, corrosion resistance pa ne welding a ɛnyɛ den. Mprempren, dade a ɛyɛ abien a ɛnyɛ den a ɛyɛ abien titiriw na ɛwɔ hɔ: CR18, CR21, ne CR25. Nneɛma titiriw a ɛwɔ saa dade welding yi mu ne: sɛ wɔde toto austenitic stainless steel ho a, ɛwɔ ɔhyew su a ɛba fam; Sɛ wɔde toto ferritic stainless steel a ɛho tew ho a, ɛwɔ su a ɛba fam a ɛma ɛyɛ mmerɛw wɔ welding akyi, ne ferrite a ɛyɛ mmerɛw kɛse wɔ beae a ɔhyew aka no wɔ welding no nso sua, enti weldability no ye.
Esiane sɛ welding no yɛ adwuma yiye wɔ saa dade yi ho nti, preheating ne post-heating ho nhia wɔ welding mu. Ɛsɛ sɛ wɔde TIG hyɛ mprɛte a ɛyɛ tratraa no mu, na wobetumi de electrode arc welding ahyɛ mprɛte a ɛwɔ mfinimfini ne nea ɛyɛ den no mu. Ɛsɛ sɛ wɔpaw electrode soronko a ɛwɔ composition a ɛte sɛ base metal anaa austenitic electrode a carbon a ɛwɔ mu no sua no ma electrode arc welding. Wobetumi de nikel-based alloy electrodes nso adi dwuma ama CR25 dual-phase steel.
Esiane sɛ ferrite fã kɛse bi wɔ hɔ wɔ dade a ɛwɔ afã abien mu nti, ferritic dade a ɛyɛ mmerɛw a ɛwɔ hɔ no, te sɛ brittleness wɔ 475°C, σ phase precipitation embrittlement ne coarse grains, da so ara wɔ hɔ esiane sɛ ɛwɔ hɔ a austenite a ɛwɔ hɔ no betumi ama welding no ayɛ yiye nti, sɛ woda so ara yɛ welding a, fa so teɛteɛm. Sɛ welding duplex stainless steels a ni anaa low Ni nni mu a, su bi wɔ hɔ a ɛne sɛ ferrite a ɛwɔ fa biako ne aburow a ɛyɛ mmerɛw wɔ beae a ɔhyew no aka no. Saa bere yi, ɛsɛ sɛ wɔde wɔn adwene si so na ama wɔatumi ahwɛ welding ɔhyew a ɛba no so, na wɔabɔ mmɔden sɛ wɔde current a ɛba fam, welding ahoɔhare a ɛkorɔn, ne teateaa a wɔde fa so no bedi dwuma. ne multi-pass welding a wɔde besiw aburow a ɛyɛ mmerɛw ne ferrite a ɛwɔ phase biako ano wɔ beae a ɔhyew no aka no, ɛnsɛ sɛ ɔhyew a ɛwɔ ntoatoaso ntam no yɛ kɛse dodo, na eye sɛ wode weld a edi hɔ no bɛpam bere a awɔw aba no.
Nea yɛaka ho asɛm wɔ atifi hɔ no nyinaa yɛ ahorow a ɛnyɛ den sɛ wobɛwe. Nanso, dade ahorow a ɛnyɛ den nso wɔ hɔ a ɛwɔ weldability a enye, te sɛ ferrite. Saa bere yi, yɛhyɛ nyansa sɛ susuw yɛn patented welding aboafo adwinnade- .Electromagnetic control arc a ɛma ɛyɛ den no afiri .. Hangao Tech (Seko Machinery) bɔɔ osuahu ne data a ɛwɔ welded pipe manufacturing equipment industry mu wɔ mfeɛ aduonu a atwam no mua, sɛdeɛ ɛbɛyɛ a, welding speed no atu mpɔn no, ɛbɛtumi nso asusu sɛnea weld no teɛ no ho. Wɔahyɛ weld no su ho bɔ, na sɛ welded pipe no hyɛn adeyɛ a edi hɔ a wɔde yɛ adwuma no mu a, wobetumi atew scrap rate no so yiye na wobetumi ama output no akɔ soro.
