Nnianim: 4 Adeyɛ Nsusuwii Titiriw: 1. Ɔhyew; 2. Nhyɛso; 3. Bere a Wɔde Ntrɛwmu; 4. Wim Tebea a Ɛbɔ Ho Ban.
1.Ɔhyew a ɛwɔ hɔ
- Ɔhyew ne sodi parameter wɔ diffusion welding mu. AbɛɛfosɛmDiffusion Welding Nneɛma a Wɔde Yɛ Adwumaenti wɔayɛ no ne ɔhyew nhyehyɛe a ɛyɛ pɛpɛɛpɛ sɛnea ɛbɛyɛ a ɛbɛhwɛ ahu sɛ atom trɛw yiye a ɛnsɛe ade a wɔde gyina so no.. Ɔhyew mu nsakrae nketenkete nya diffusion rates so nkɛntɛnso kɛse. Wɔ anohyeto ahorow a ntease wom mu no, ɔhyew a ɛkɔ soro ma nkwaa no trɛw ntɛmntɛm na ɛma nkwaa no ahoɔden tu mpɔn. Enti, ɛsɛ sɛ wɔpaw ɔhyew a ɛkorɔn bere biara a ɛbɛyɛ yiye.
- Nanso, ɔhyew a ɛyɛ hyew no anohyeto esiane ɔhyew ahoɔden a ɛkorɔn-a ɛwɔ adwumayɛbea ne nneɛma a wɔde si hɔ mu, ne dade su te sɛ nneɛma fã nsakrae ne recrystallization nti. Sɛ ɔhyew boro bo pɔtee bi a, nkwaa no su a ɛkɔ anim no sua na ebetumi asɛe mpo.
- Wɔ dadeɛ ne alloys dodoɔ no ara fam no, diffusion welding temperature firi 0.6 kɔsi 0.8 mpɛn melting point a ɛwɔ base material (Tm, unit K). Wɔ diffusion welding a ɛfa nsuo fapem ho no, ɛsɛ sɛ ɔhyeɛ hyeɛ no kɔ soro kakra sene melting point a ɛwɔ mfimfini layer ade anaa eutectic reaction temperature, a akyiri yi ɛyɛ onwini a ɛfata wɔ isothermal solidification ne homogenization stages mu. Sɛ wɔde infrared thermometers ahyɛ polymer diffusion welding mfiri ahorow mu a, ɛma ɛyɛ mmerɛw sɛ wɔbɛhwɛ ɔhyew so pɛpɛɛpɛ.
2.Nhyɛso
- Sɛ parameters afoforo kɔ so yɛ nea ɛkɔ so daa a, nhyɛso a ɛkorɔn no boa ma wɔyɛ nkwaa a ɛkorɔn-quality. Nhyɛso anohyeto a ɛwɔ soro no yɛ nea adwumayɛbea no deformation anohyeto ne mfiri tonnage tumi na ɛhyɛ so. Wɔ dade diffusion welding a ɛnsɛ ho no, nhyɛso a ɛkɔ soro boa ma diffusion voids so tew anaasɛ ɛkwati.
- Amanneɛbɔ diffusion welding nhyɛso fi 0.5 kosi 50 MPa (a ɔhyew isostatic pressing nka ho). Wobetumi de nhyɛso a ɛba fam adi dwuma ama nsu-fase参与的 diffusion welding; nanso, nhyɛso a ɛboro so betumi ama wɔapiapia dade a ɛyɛ nsu afi mu, na ɛde nsɛm a ɛfa nneɛma a ɛwom no sohwɛ ho aba.
- Esiane sɛ diffusion pressure nni nkɛntɛnso kɛse wɔ akyiri yi diffusion stages mu nti, solid-state diffusion welding betumi atew nhyɛso so wɔ akyiri yi phases mu de atew workpiece deformation so.
3.Diffusion Bere a wɔde trɛw
- Diffusion bere kyerɛ bere tenten a wɔde hwɛ adwuma afã horow no so wɔ welding ɔhyew mu, a ɛsɛ sɛ ɛhwɛ hu sɛ diffusion nhyehyɛe no awie koraa na ama wɔanya ahoɔden a ɛho hia a ɛka bom no. Bere a ɛnnɔɔso mma nkwaa ahoɔden ntumi nkɔ nneɛma a wɔde gyina so no so pintinn.
- Ɔhyew a ɛkorɔn-ne nhyɛso a ɛkorɔn-nhyɛso bere tenten a ɛware dodo no ma nkɔso kakraa bi ba nkwaa no su mu na ebetumi ama base material aburow ayɛ mmerɛw mmom. Wɔ nkwaa a ɛyɛ mmerɛw sɛ ɛbɛyɛ brittle intermetallic compounds ho no, ɛsɛ sɛ wɔhwɛ diffusion bere so na ama brittle layer thickness ano hye na wɔahwɛ ahu sɛ nkwaa no yɛ adwuma.
- Diffusion bere nyɛ ade a ɛsakra a ɛde ne ho nanso ɛne ɔhyew ne nhyɛso wɔ abusuabɔ kɛse: ɔhyew a ɛkɔ soro anaa nhyɛso kɛse hwehwɛ bere tiaa.
- Sɛ diffusion welding ne mfinimfini layers, welding bere gyina mfinimfini layer thickness ne ahwehwɛde ahorow ma joint nhyehyɛe uniformity (a allowable brittle phase content ka ho). Wɔ mfasoɔ a wɔde di dwuma mu no, welding bere betumi afi simma pii akosi nnɔnhwerew pii, a egyina nhyehyɛe no parameters a wɔaka abom so.
4.Wim tebea a Ɛbɔ Ho Ban
- Ahotew, nsu a ɛsen, nhyɛso anaa vacuum dodow, ne nsu a ɛtwetwe wɔ wim a ɛbɔ ho ban no mu no nya nkwaa no su so nkɛntɛnso tẽẽ. Mframa a wɔtaa de bɔ ho ban ne argon, a vacuum dodow a wɔtaa de yɛ (1-20)×10−3 Pa. Nneɛma bi nso betumi de nitrogen, hydrogen, anaa helium a ɛho tew kɛse adi dwuma.
- Wɔ superplastic forming ne diffusion welding composite akwan mu no, wɔtaa de argon negative pressure (low vacuum) di dwuma de bɔ dade ani ho ban. Wɔ nneɛma a ɛrenya phase transformation bere a onwini ne brittle nneɛma te sɛ ceramics, ɛsɛ sɛ wɔhwɛ ɔhyew ne onwini dodow so.
- Wɔ eutectic reaction diffusion welding mu no, ɔhyew a ɛyɛ brɛoo dodo betumi ama nsakrae aba contact surface composition mu esiane diffusion nti, na ɛka eutectic melting effectiveness.
Awie
Mastering diffusion welding parameters hwehwɛ sɛ wɔte ankorankoro nkɛntɛnso ne wɔn nkitahodi a ɛyɛ den nyinaa ase. Ɛdenam ɔhyew, nhyɛso, bere, ne wim tebea a wɔhwɛ so yiye so no, wɔn a wɔyɛ no betumi ayɛ nkwaa a mfiridwuma mu su bɛn mfitiase nneɛma tumi. SɛDiffusion Welding Nneɛma a Wɔde Yɛ Adwuma bɛyɛ nea ɛyɛ nwonwa kɛse, parameters a ɛyɛ den, a wɔayɛ no yiye a wɔde di dwuma no bɛyɛ nea wotumi nya, na ɛtrɛw application ahorow a wobetumi de adi dwuma wɔ ahunmu, ahoɔden, ne nneɛma a wɔyɛ a ɛkɔ anim mu.
