Carbide Vuam Tshuab, txheej txheem, thiab kev siv tshuab

Cemented carbide, muaj npe nrov rau nws qhov tshwj xeeb hardness (txog 90 HRC) thiab hnav tsis kam, yog dav siv rau hauv cov cuab yeej txiav, cov khoom siv mining, thiab cov khoom siv los ntawm vuam. Txawm li cas los xij, nws lub siab brittleness thiab mismatched thermal expansion coefficient (TEC) nrog steel substrates (4–7 × 10⁻⁶/°C vs. Kab lus no hais txog cov txheej txheem vuam tseem ceeb, kev tswj cov txheej txheem tseem ceeb, thiab kev siv lub ntiaj teb tiag tiag rau cov ntaub ntawv carbide.

1. Dominant Welding Technologies rau Carbide

Ob txoj kev yeej nyob rau hauv kev lag luam carbide koom nrog: brazing (paub tsis tau txhim khu kev qha) thiab laser vuam (advanced precision tov). Lawv cov yam ntxwv tseem ceeb yog muab piv rau hauv qab no:

▶ Brazing: Kev Ua Haujlwm ntawm Carbide Tool Manufacturing

Brazing ua tiav kev sib raug zoo los ntawm melting ib tug muab tub lim hlau (qis melting point tshaj carbide / steel) kom ntub thiab sau cov qhov sib koom ua ke, tsis muaj melting cov ntaub ntawv hauv paus. Nws yog thawj txheej txheem rau cov cuab yeej carbide vim nws cov nqi-zoo thiab kev sib raug zoo nrog ntau lawm.

Cov Ntsiab Cai Tseem Ceeb & Kev Xaiv Filler

Bonding Mechanism: Molten muab tub lim hlau infiltrates micro-nruab nrab ntawm capillary nkaus, tsim metallurgical bonds nrog carbide (WC-Co) thiab steel substrates los ntawm lub caij diffusion (piv txwv li, Cr hauv muab tub lim reacts nrog C hauv carbide rau daim ntawv Cr₃C₂).

Filler Alloys:

Ni-Cr-raws li: Nyiam rau kev siv kub kub (piv txwv li, cov cuab yeej milling), yaj ntawm 1050-1150 ° C, thiab muaj oxidation zoo heev.

Ag-Cu-Based: Siv rau cov cuab yeej tsis tshua muaj kev ntxhov siab (piv txwv li, tshuab dhos inserts), melts ntawm 650-800 ° C, txo thermal shock.

Cu-Based: Kev xaiv kev lag luam rau cov cuab yeej siv dav dav, yuav tsum muaj flux tshem tawm cov yeeb yaj kiab oxide.

▶ Laser Vuam: Precision Joining rau cov cuab yeej ua tau zoo

Laser vuam siv lub teeb tsom teeb (1.06μm fiber ntau laser nyiam) los tsim cov pas dej molten hauv zos, ua kom muaj zog siab, qis deformation pob qij txha. Nws yog qhov zoo tagnrho rau cov cuab yeej micro thiab cov geometry nyuaj.

Technical Advantages Over Brazing

Tsawg Thermal Impact: Thaum tshav kub kub-cuam tshuam cheeb tsam (HAZ)

Kev Ua Haujlwm nrawm: Vuam nrawm txog 50mm / s rau carbide inserts, 3x sai dua induction brazing.

Filler-Free Option: Direct fusion rau nyias-walled carbide Cheebtsam (piv txwv li, micro-drills).

2. Cov Txheej Txheem Tseem Ceeb & Cov Tswv Yim Txom Nyem

Carbide welding tsis ua haujlwm feem ntau yog los ntawm qhov seem ntawm kev ntxhov siab thiab kev ntub dej tsis zoo. 

Cov kev daws teeb meem yog qhov tseem ceeb:

▶ Kev ntxhov siab thiab tawg

Lub hauv paus ua rau: TEC mismatch ua rau thermal contraction sib txawv thaum lub sij hawm txias, tsim tensile kev nyuaj siab nyob rau hauv carbide.

Kev daws:

Siv cov khaubncaws sab nraud povtseg (piv txwv li, Ni-Cu alloy) kom nqus tau kev ntxhov siab.

Txais cov cua sov / cua txias (ramp tus nqi ≤10 ° C / s) hauv induction brazing.

Tom qab vuam tempering ntawm 250 ° C rau 2 teev kom txo tau kev ntxhov siab los ntawm 30-50%.

▶ Cov dej tsis zoo

Lub hauv paus ua rau: Carbide lub zog saum npoo av tiv thaiv cov hlau nkag mus.

Kev daws:

Ua ntej kho carbide nrog Cr hmoov los ua Cr₃C₂ txheej txheej.

Siv cov active fluxes (xws li, borax-based) kom tshem tawm cov oxide zaj duab xis ntawm cov hlau substrates.

▶ Filler Hlau Erosion

Lub hauv paus ua rau: Cov cua kub ntau dhau ua rau cov carbide's Co binder, ua rau cov leeg tsis muaj zog.

Kev daws:

Txwv lub sijhawm vuam rau

Tswj lub sijhawm laser mem tes (2-5ms) kom tsis txhob raug lub sijhawm ntev.

3. Cov Ntawv Thov Kev Lag Luam & Case Studies

Carbide welding ua rau cov cuab yeej ua tau zoo thoob plaws cov haujlwm:

▶ Txiav cuab yeej Manufacturing

CNC Tool Inserts: Induction brazing ntawm WC-Co insertss rau steel shanks siv Ni-Cr-B-Si muab tub lim (1080 ° C, 45s) ua tiav 200MPa sib koom ua ke lub zog - nrog rau 5000rpm machining loads.

Circular Saw Blades: Automated laser vuam (300W fiber ntau laser) ntawm cov hniav carbide rau steel discs txo cov hniav tawg ntawm 60% vs.

▶ Mining & Kev tsim kho

Pob zeb Drilling Bits: Nqus brazing ntawm carbide nyees khawm rau steel lub cev (Ni-Cr muab tub lim, 1120 ° C) kom ntseeg tau tias tsis kam mus rau 50MPa cuam tshuam loads; kev pab cuam lub neej txuas ntxiv los ntawm 2-3x.

▶ Precision Engineering

Cov cuab yeej Micro-Machining: Fiber laser welding ntawm 0.8mm carbide tswv yim rau stainless hlau shafts (250W, 15mm / s) tswj ± 0.01mm qhov tseeb qhov tseeb rau semiconductor wafer txiav.

4. Yav tom ntej Trends

Hybrid Vuam: Muab cov laser ua ntej cua sov nrog induction brazing kom txo cov carbide tawg hauv cov pob qij txha tuab.

Active Filler Development: Ni-Cr-Ti fillers uas tsim muaj zog TiC daim ntawv cog lus nrog carbide, txhim kho kev sib koom ua ke los ntawm 30%.

Automation Integration: AI-tsav tshuab nrog lub sij hawm ntawm kev soj ntsuam xyuas thermal kom zoo dua qhov kev sib txuas ntawm cov qib carbide sib txawv.

Xaus

Carbide welding xav tau qhov sib npaug ntawm cov khoom siv tshawb fawb thiab kev tswj cov txheej txheem-brazing excels hauv cov nqi-npaum huab hwm coj ntau lawm, thaum laser vuam dominates precision-critical applications. Los ntawm kev daws cov teeb meem kev ntxhov siab thiab cov nyom ntub dej, cov tuam txhab lag luam tuaj yeem qhib lub peev xwm ntawm carbide tag nrho hauv cov khaub ncaws hnav, kev ntxhov siab, los ntawm kev lag luam machining mus rau kev lag luam mining.