Asɛnnennen a ɛfa welds a ɛyɛ mmerɛw anaa "nwini" ho-a fusion a ɛnnɔɔso ma nkwaa ahoɔden a ɛnnɔɔso-da so ara yɛ akwanside titiriw wɔ aluminium a wɔyɛ mu. Bere a nnwuma te sɛ kar, ɛlɛtrɔnik mfiri, ne ahunmu de wɔn ho to aluminium adan a emu yɛ hare so kɛse no, hwɛ a wɔbɛhwɛ ahu sɛ wotumi de ho to nkitahodi so no yɛ nea ɛho hia sen biara. Saa akwankyerɛ yi de akwan a mfaso wɔ so, a nnwuma-gyina akyi a wɔde beyi weld a ɛyɛ nwini afi hɔ denam wospot welding afiri a wɔde yɛ nneɛmane nhyehyɛe a wɔde di dwuma sohwɛ.
Asɛnnennen no ho ntease: Nea enti a Aluminium Spot Welds Di Dwuma
Sɛ obi betumi ayɛ aluminium yiye a, ɛsɛ sɛ odi kan te abɔde mu nneɛma soronko a ɛma ɛyɛ den kɛse bere a wɔde toto dade ho no ase. "Cold weld" yɛ nkwaa a ɛte sɛ nea ɛyɛ den wɔ ne nhyehyɛe mu wɔ soro nanso enni emu fusion a wɔhwehwɛ (nugget formation), a ɛde nkitahodi a ɛyɛ mmerɛw, a wontumi mfa ho nto so ba.
Nkyerɛase a Ɛfa Cold Weld Ho
Awɔw mu weld, a wɔtaa frɛ no "atoro weld" anaa "virtual weld" ba bere a ɔhyew a ɛba bere a wɔreyɛ resistance spot welding nhyehyɛe no nnɔɔso sɛ ɛbɛma wɔayɛ nugget a ɛyɛ nwini a ɛfata wɔ dade nkrataa abien no ntam. Saa fusion a enni hɔ yi kyerɛ sɛ nkwaa no de ne ho to mfiri nhyɛso ne soro nkitahodi nkutoo so, na ɛde huammɔdi ntɛm wɔ nhyɛso ase.
Adwumayɛ Nnyinasosɛm a Ɛfa Nkonimdi Ho
Nneɛma titiriw a ɛde awɔw mu welds a ɛwɔ aluminium mu ba no fi ne honam fam nyansahu mu:
- 1.Oxide a Ɛma Nneɛma Yɛ Fɛ a Ɛma Nneɛma Yɛ Fɛ no: Aluminium fi awosu mu yɛ aluminium oxide (Al2O3) a ɛyɛ tratraa na ɛyɛ den wɔ ne soro. Saa oxide yi nwene boro digrii 2,000 (digrii F 3,632), na ɛkorɔn koraa sen sɛnea aluminum dade a ɛwɔ ase no nwene bɛyɛ digrii 660 (digrii F 1,220). Saa ade a ɛko tia kɛse yi yɛ adwuma sɛ insulator, na ɛmma welding current no nsen bere nyinaa na ɛma ɔhyew a ɛho hia ma fusion.
- 2.Ɔhyew a Ɛboro So a Wɔsɛe no: Aluminium de anyinam ahoɔden a ɛkɔ soro (dade de mmɔho anan) ne ɔhyew a ɛkɔ soro (dade de mmɔho abiɛsa) hoahoa ne ho. Ɔhyew a ɛba wɔ ntam no kɔ ntɛmntɛm kɔ akyirikyiri fi weld beae no. Sɛ wɔamfa welding ahoɔden no amma a current density a ɛkorɔn yiye na ɛkyɛ a, ɔhyew no bɛyera ansa na nugget a ayɛ nwini atumi ayɛ.
- 3.Nhyɛso a Wɔde Di Dwuma a Ɛnyɛ Pɛpɛɛpɛ: Sɛnea aluminium yɛ mmerɛw no ma ɛyɛ mmerɛw kɛse wɔ electrode ahoɔden ho. Ahoɔden pii ma ahoɔden a ɛko tia nkitahodi no so tew, na ɛma ɔhyew a ɛnnɔɔso ba. Ahoɔden kakraa bi betumi ama nsu apetepete (apam) dodo na electrode no akɔ so abata ho.
Ano aduru: Wo Spot Welding Machine a Wobɛma Aluminum Ayɛ Yiye
Weld a ɛyɛ nwini a wobeyi afi hɔ no hwehwɛ sɛ wɔfa ɔkwan a ɛkɔ akyiri a efi ase denam nnwinnade a ɛfata ne nhyehyɛe a wɔhwɛ so pɛpɛɛpɛ so.
Mfaso a Ɛwɔ Medium Frequency DC (MFDC) Mfiridwuma So
Sɛ wopɛ aluminium spot welding a ɛkorɔn-a, nnwuma gyinapɛn no asesa afi atetesɛm AC welders so akɔ Medium Frequency Direct Current (MFDC) inverter mfiridwuma so. Mfaso a ɛwɔ so no yɛ nea ɛho hia:
- Pɛpɛɛpɛ ne Ahoɔhare: MFDC nhyehyɛe ahorow no yɛ adwuma wɔ frequency a ɛkorɔn (mpɛn pii no 1,000 Hz kosi 4,000 Hz), na ɛma kwan ma mmuae bere a ennu milisekɔn 0.5. Saa ahoɔden a wɔde ma ntɛmntɛm na ɛyɛ pɛpɛɛpɛ yi ho hia kɛse na ama wɔadi aluminium ɔhyew a ɛkɔ soro no so nkonim.
- Ahoɔden a Wɔde Di Dwuma Yie: DC output brɛ inductive losses ase, na ɛma adeyɛ no yɛ ahoɔden-a ɛyɛ adwuma yiye na ɛyɛ den sɛ wɔde toto AC nhyehyɛe ho a.
- Weld a Ɛyɛ Nkɔso: Tumi a ɛkorɔn a ɛwɔ mprempren asorɔkye no so no hwɛ hu sɛ ɔhyew a ɛkɔ so daa, a ɛho hia ma nugget su a wɔbɛkɔ so akura mu wɔ high-volume production runs nyinaa mu.
Pɛpɛɛpɛ Parameter Control
Aluminium welding hwehwɛ parameters a ɛsono koraa wɔ dade ho-taa yɛ mmɔho 2 kosi 3 mprempren ne weld bere tiaa kɛse, sɛnea gyinapɛn te sɛ AWS C1.1 ne ISO 18595 kyerɛ no.
| Nneɛma a Wɔde Yɛ Adwuma (mm) . | Ɛlektrode Ahoɔden (kN) . | Welding Mprempren (kA) . | Weld Bere (Kyinhyia/60Hz) . | Target Nugget Ntrɛwmu (mm) . |
| 0.8 | 2.0 - 3.0 | 18 - 22 | 3 - 5 | 4.5 - 5.0 |
| 1.2 | 3.0 - 4.5 | 24 - 30 | 5 - 8 | 5.5 - 6.0 |
| 1.5 | 4.0 - 5.5 | 28 - 35 | 6 - 10 | 6.0 - 7.0 |
Adeyɛ a eye sen biara: Fa multi-pulse welding nhyehyɛe di dwuma. Wobetumi de pre-weld pulse adi dwuma de abubu oxide layer no mu, na wɔadi akyi no welding pulse titiriw a wɔde yɛ fusion, ne post-weld temper pulse de atew ahoɔhare a ɛma onwini so na wɔatew mpaapaemu so.
Nea Ɛho Hia Pre-Weld Surface Ahosiesie
Fafa a ɛho tew no nyɛ -negotiable. Afiri a wɔde yɛ spot welding a ɛkɔ anim sen biara mpo ntumi ntua tebea a enye a ɛwɔ soro no ho ka.
- Mfiri a Wɔde Siesie Ahotew: Fa brɔs a wɔde dade a ɛnyɛ den ayɛ a wɔahyira so anaasɛ abrasion nhyehyɛe a wɔde yɛ adwuma di dwuma de yi oxide a ɛwɔ mu no fi hɔ.
- Nnuru a Wɔde Tew Ahotew: Fa acid anaa alkaline aduru a ɛnyɛ den di dwuma ma nnuru a wɔde yi mframa fi mu.
- Bere a Wɔde Yɛ Nkate: Aluminium fi ase yɛ re-oxidize ntɛm ara. Ɛsɛ sɛ wɔyɛ welding wɔ nnɔnhwerew 2 kosi 8 mu bere a wɔasiesie ɔfasu no na ama wɔahwɛ ahu sɛ wɔbɛko atia bere nyinaa.
Electrode a Wɔde Di Dwuma ne Ne Siesie
Kɔbere electrode ne aluminium afrafra ntɛm wɔ ɔhyew a ɛkɔ soro mu, na ɛma electrode no anim yɛ fĩ na ɛsakra ne nsusuwii (a ɛbata ho).
- Electrode Nsusuwii: Fa dome-nsɛso electrodes a anim radius yɛ 50mm kosi 100mm di dwuma.
- Nneɛma a Wɔde Siesie Nneɛma a Wɔde Yɛ Adwuma: Fa electrode dressing nhyehyɛe a ɛyɛ adwuma ankasa di dwuma. Ɛsɛ sɛ wɔhyɛ electrode ahorow no yiye wɔ weld 50 kosi 100 biara akyi na ama wɔakura geometry ne conductivity a ɛfata mu, na ama woahwɛ ahu sɛ wo spot welding afiri no adwumayɛ kɔ so yɛ nea eye sen biara.
Nneɛma a Ɛyɛ Pa a Wɔbɛhwɛ ne Nkɔso a Ɛkɔ So
Sɛnea ɛbɛyɛ a wobɛhwɛ ahu sɛ nneɛma a ɛyɛ papa bɛkɔ so atra hɔ no, fa nhyehyɛe a ɛyɛ den a wɔde hwɛ sɛ ɛyɛ nokware di dwuma:
- Sɔhwɛ a Ɛsɛe ade: Ɛho hia sɛ wɔyɛ peel sɔhwɛ daa na ama wɔahwɛ sɛ weld nugget diameter no du kɛse a ɛba fam koraa a wɔhwehwɛ no ho.
- Sɔhwɛ a Ɛnyɛ-Ɔsɛe ade (NDT) .: Sɛ wopɛ dwumadie a ɛho hia a, fa ultrasonic sɔhwɛ anaa dynamic resistance monitoring di dwuma de hwɛ sɛ emu sintɔ biara nni mu a ɛnsɛe ɔfã no.
- Data a Wɔde Kyerɛw Nsɛm: Fa Industrial IoT (IIoT) nhyehyɛe ahorow di dwuma de kyerɛw mprempren, ahoɔden, ne bere curves ma weld biara, ma traceability a edi mũ na ɛma nkɔso a ɛkɔ so wɔ nhyehyɛe mu no yɛ mmerɛw.
Awie
Sɛ wobeyi weld a ɛyɛ nwini afi hɔ wɔ aluminium mu a, ɛhwehwɛ sɛ wɔde wɔn ho ma sɛ wɔbɛyɛ no pɛpɛɛpɛ wɔ adeyɛ no afã horow nyinaa mu. Ɛdenam sika a wɔde bɛto MFDC mfiridwuma mu, parameter akwankyerɛ a ɛyɛ katee a wodi so, ne ɔfasu ne electrode sohwɛ a ɛyɛ katee a wɔbɛkɔ so akura mu so no, wɔn a wɔyɛ no betumi anya nkwaa a wotumi de ho to so, ahoɔden a ɛkorɔn-a ɛne nnwuma gyinapɛn hyia anaasɛ ɛboro so.
