Welding su a ɛwɔ austenitic stainless steel mu: elastic ne plastic stress ne strain bere a welding no yɛ no yɛ kɛse paa, nanso mpaapaemu a ɛyɛ nwini ntaa mpue. quench hardening zone biara nni hɔ na grain coarsening wɔ welded joint no mu, enti tensile ahoɔden a ɛwɔ weld no mu no yɛ kɛse.
Ɔhaw atitiriw a ɛwɔ austenitic stainless steel welding mu: welding kɛse a ɛyɛ mmerɛw; Esiane sɛ ɛwɔ aburow hye so su ne sɛnea ɛyɛ mmerɛw wɔ efĩ nketenkete bi ho (S, P) nti, ɛnyɛ den sɛ wɔbɛma mpaapaemu a ɛyɛ hyew aba.
Welding ho haw atitiriw anum ne ayaresa ho nhyehyɛe a ɛfa austenitic stainless steel ho .
1. Chromium carbide a ɛba no ma tumi a welded nkwaa tumi gyina intergranular corrosion ano no so tew.
Intergranular corrosion: Sɛnea chromium a ɛso tew ho nkyerɛkyerɛ kyerɛ no, chromium carbide no pue wɔ aburow hye so bere a wɔma weld ne ɔhyew a ɛwɔ beae no yɛ hyew kodu sensitization temperature zone a ɛyɛ 450-850 °C no so, na ɛde chromium-depleted grain boundaries ba, a ɛno ntumi nnyina corrosion ano.
(1) Wobetumi de gyinaesi ahorow a edidi so yi adi dwuma de asiw nsɛe a ɛda weld seam ne sensitization temperature zone ntam wɔ ade a wɔde asi wɔn ani so no ntam:
a. Tew carbon a ɛwɔ dade a ɛwɔ ase ne welds no mu, fa nneɛma a ɛma ɛyɛ den Ti, NB ne nneɛma afoforo ka ho wɔ dade a ɛwɔ ase no mu na ama MC a wɔbɛhyehyɛ no adi kan na wɔakwati CR23C6 a wɔbɛhyehyɛ no.
b. Ma weld no nyɛ austenite ne ferrite kakraa bi. Sɛ ferrite dodow bi wɔ weld no mu a, wobetumi ayɛ aburow no yiye, wobetumi ama aburow no fã no ayɛ kɛse, na chromium carbide a ɛtɔ wɔ unit area a ɛwɔ ??aburow no hye so no so atew. Chromium yɛ nea ɛtumi nwura mu kɛse wɔ ferrite mu. CR23C6 yɛ nea wɔpɛ wɔ ferrite mu a ɛmma austenite aburow hye no so tew wɔ chromium mu; ferrite a ɛtrɛw austenites no ntam no betumi asiw nsu a ɛwɔ aburow no hye so no ano wɔ mu a ɛtrɛw no.
c. Hwɛ bere a wɔde tra hɔ wɔ sensitization temperature range no mu. Yɛ nsakrae wɔ welding thermal cycle no mu, ma bere a ɛtra hɔ no yɛ 600～1000°C sɛnea ɛbɛyɛ yiye biara, paw welding kwan a ahoɔden a ɛwɔ mu no yɛ kɛse (te sɛ plasma argon arc welding), paw welding ɔhyew a ɛba fam, na fa argon a ɛwɔ weld no akyi no twa argon anaasɛ fa di dwuma wɔ weld no so bere a wɔde yɛ no ma onwini a wɔde ma no no yɛ kɛse na woamfa arc no ayɛ kɛse na ama woafi ase ayɛ no sɛnea Ɛsɛ sɛ wɔde welded weldew medium bere a wɔreyɛ multilayer welding no sɛnea ɛbɛyɛ yiye biara.
d. Sɛ welding wie a, yɛ solution treatment anaasɛ stabilization annealing (850～900°C) ne mframa a ɛma onwini ma carbides no charge fi na ɛma chromium no trɛw ntɛmntɛm).
(2) Ntini a wɔde weld ayɛ a ɛte sɛ sekan. Esiane eyi nti, wobetumi ayɛ nneɛma a edidi so yi a wɔde siw yare ano:
Esiane sɛ carbon tumi trɛw mu denneennen nti, ɛbɛtetew mu wɔ aburow hye no so ma ayɛ tebea a ɛyɛ den sen biara wɔ onwini no mu, bere a Ti ne NB da so ara wɔ ahwehwɛ no mu esiane tumi a ɛba fam a wɔde trɛw mu nti. Sɛ wɔsan yɛ welded joint no hyew wɔ sensitization temperature range mu a, supersaturated carbon bɛtɔ wɔ CR23C6 ntam wɔ crystals no ntam.
bi. Tew carbon a ɛwɔ mu no so. Wɔ stainless steel a ɛwɔ stabilizing elements ho no, ɛnsɛ sɛ carbon a ɛwɔ mu no boro 0.06%.
b. Fa welding nhyehyɛe a ntease wom di dwuma. Paw welding ɔhyew a ɛyɛ ketewaa bi na ama bere a ɛwɔ beae a ɛyɛ hyew dodo no atra ɔhyew kɛse mu, na hwɛ yiye sɛ wobɛkwati 'medium temperature sensitization' nkɛntɛnso wɔ welding nhyehyɛe no mu. Sɛ welding a ɛwɔ afã abien a, ɛsɛ sɛ wɔde weld a ɛne corrosive medium no di nkitaho no welded last (eyi ne nea enti a wɔyɛ welding a ɛwɔ mu a ɛyɛ kɛse-diameter thick-wall welded pipes no wɔ abɔnten welding no akyi). Sɛ wɔantumi amfa anni dwuma a, ɛsɛ sɛ wɔyɛ welding specification ne weld shape no mu nsakrae na amma baabi a ɛyɛ hyew dodo no a ɛne corrosive medium no di nkitaho no yɛ nea ɛyɛ mmerɛw bio na ɛyɛ hyew.
c. weld akyi ɔhyew ayaresa. Yɛ ano aduru anaasɛ stabilization ayaresa akyi welding.
2. Adwennwene a ɛyɛ mmerɛw sɛ ɛbɛpaapae .
Wobetumi de nsusuwii a edidi so yi adi dwuma de asiw adwennwen a ɛpaapae no mu mpaapaemu ano:
a. Paw nneɛma no yiye na yɛ nsakrae wɔ weld no mu wɔ ntease mu. High-purity chromium-nickel austenitic stainless steel, high silicon chromium-nickel austenitic stainless steel, ferritic-austenitic stainless steel, high-chromium ferritic stainless steel, etc. wɔ adwennwene a ɛyɛ papa a ɛma adwennwen no nsɛe, na weld metal no yɛ austentic it-fan a ɛyɛ den.
b. Yi adwennwen a aka no fi hɔ anaasɛ ɛtew so. Yɛ post-weld stress relief heat treatment, na fa mfiri akwan te sɛ polishing, shot peening ne hammering di dwuma de tew surface residual stress so.
c. Ntease nhyehyɛe ho nhyehyɛe. Sɛnea ɛbɛyɛ a wɔrenhaw adwennwen kɛse.
3. Welding mu mpaapaemu a ɛyɛ hyew (ahwehwɛ mu mpaapaemu wɔ weld mu, nsu a ɛyɛ nwini mu mpaapaemu wɔ beae a ɔhyew ka ho) .
Sɛnea ɔhyew mu mpaapaemu te nka no gyina nnuru a ɛwɔ mu, nhyehyɛe ne sɛnea ɛyɛ adwuma no so titiriw. Ni yɛ mmerɛw sɛ wobɛyɛ low melting point compounds anaa eutectic a efĩ te sɛ S ne P. boron ne silicon a wɔbɛtetew mu no bɛma ɔhyew mu mpaapaemu aba. Ɛnyɛ den sɛ weld no bɛyɛ coarse columnar crystal structure a ɛwɔ directionality a emu yɛ den, a ɛboa ma efĩ ne nneɛma a epira no mu paapae. Eyi hyɛ nsu a ɛyɛ nsu a ɛwɔ ntam a ɛkɔ so yɛ adwuma no ho nkuran na ɛma ɔhyew mu mpaapaemu no yɛ mmerɛw. Sɛ welding no nyɛ hyew pɛpɛɛpɛ a, ɛnyɛ den sɛ wobɛyɛ tensile stress kɛse na ama welding a ɛyɛ hyew no mu mpaapaemu aba.
Nneɛma a wɔde siw ano:
a. Di efĩ a epira S ne P.
b. Siesie sɛnea weld dade no te. Dual-phase structure weld no wɔ mpaapaemu a ɛyɛ papa a ɛko tia. Delta phase a ɛwɔ weld no mu no betumi asiesie aburow no, ayi austenite a ɛwɔ fase biako no kwan no afi hɔ, atew efĩ a epira a ɛwɔ aburow hye so no mu a ɛtew so, na delta fã no betumi apete kɛse S ne P betumi atew ntam ahoɔden no so na ayɛ nhyehyɛe a ɛbɛma wɔayɛ nsu a ɛyɛ nsu a ɛwɔ ntam no.
c. Siesie weld metal alloy a ɛwɔ mu no. Sɛnea ɛfata ma Mn, C, ne N a ɛwɔ austenitic dade a ɛwɔ afã biako no mu no yɛ kɛse, na fa nneɛma nketenkete bi te sɛ cerium, pickaxe, ne tantalum (a ebetumi asiesie weld nhyehyɛe no na wɔatew aburow hye no ho), a ebetumi atew ɔhyew a ɛpaapae no nkate so.
d. Nneɛma a wɔde yɛ adwuma. Tew ɔhyew a ɛboro so a ɛwɔ ɔtare a ayow no mu no so na amma adum ahwehwɛ a ɛyɛ den anhyehyɛ. Fa ɔhyew a wɔde hyɛ mu nketewa ne cross-section weld beads nketewa di dwuma.
Sɛ nhwɛso no, 25-20 austenitic dade taa yɛ nsu mu mpaapaemu. Ɛyɛ yie sɛ wɔbɛto efĩ a ɛwɔ mu ne aburoo kɛseɛ a ɛwɔ base material no mu ano hyeɛ, agye ahoɔden density welding akwan no atom, ɔhyew a ɛwɔ mu nketewa na ama onwini a ɛwɔ nkwaa no mu no akɔ soro.
4. Ntini a wɔde weld ayɛ a ɛyɛ mmerɛw .
Ɛsɛ sɛ dade a ahoɔden wom a ɛyɛ den no hwɛ hu sɛ nkwaa a wɔde weld ayɛ no plasticity na asiw ɔhyew a ɛkɔ soro a ɛyɛ mmerɛw no ano; Ɛsɛ sɛ dade a ɛyɛ hyew a ɛba fam no nya ɔhyew a ɛba fam a ɛyɛ den yiye na amma nsu a ɛyɛ hyew a ɛyɛ mmerɛw no abubu.
5. Welding a wɔkyinkyim no kɛse .
Esiane sɛ ɔhyew a ɛkɔ fam ne ntrɛwmu nsusuwii kɛse nti, welding deformation yɛ kɛse, na wobetumi de clamps adi dwuma de asiw deformation ano.
Sɛ wo nso wowɔ ɔhaw ahorow a yɛaka ho asɛm wɔ atifi hɔ no a, wubetumi ayɛ adeyɛ no mu nhwehwɛmu denam paipu welding nhyehyɛe no a wobɛhwɛ so. Afei fa akwan a ɛne no hyia so di ɔhaw no ho dwuma sɛnea tebea a ɛne no hyia no te. Wɔ element a ɛwɔ ade no ankasa mu no akyi no, nsusuwso, arches no kyekyɛ, welding current, ne welding ahoɔhare a welded pipe unit no benya nkɛntɛnso pɔtee bi wɔ welded pipe no su so. sɛ A . Professional manufacturer of industrial welded pipe production equipment , yɛma wo akwaaba sɛ wo ne bedi nkitaho , na hwɛ kwan sɛ wo ne wo benya nkɔso. Hangao Tech . ɔhaw ahorow a wuhyia wɔ austenitic welded pipes a wɔyɛ mu no
