Dab tsi yog hardfacing

Hardfacing yog qhov tso tawm ntawm cov txheej tuab ntawm cov tawv tawv, hnav-tiv taus cov ntaub ntawv ntawm ib qho hnav lossis cov khoom siv tshiab uas yuav tsum hnav.los ntawm kev vuam, thermal txau, lossis cov txheej txheem zoo sib xws. Thermal spraying, spray-fuse thiab vuam txheej txheem feem ntau yog siv los siv cov txheej txheem nyuaj. Cov ntaub ntawv siv feem ntau suav nrog cobalt-based alloys (xws li tungsten carbide), nickel-based alloys,chromium carbidealloys, lwm. Hardfacing qee zaum ua raws li kub stamping kom rov ua kom tiav cov khoom lossis ntxiv cov xim lossis cov ntaub ntawv qhia rau ib feem. Foils lossis zaj duab xis tuaj yeem siv rau qhov zoo nkauj lossis lwm yam kev tiv thaiv

Thermal spraying yog nyiam rau cov ntawv thov uas yuav tsum tau thermal distortion tsawg kawg nkaus ntawm cov khoom thiab tswj cov txheej txheem zoo. Cov khoom siv tawv tawv uas tso los ntawm cov tshuaj txau thermal muaj xws li cermets xws li WC-Co thiab alumina-based ceramics. Cov txheej no yog siv rau lub thickness ntawm li 0.3 hli.

Spray-fuse coatings kuj hu ua self-fluxing overlay coatings, yog thawj zaug siv rau cov khoom siv nto siv cov txheej txheem nplaim hluav taws thiab tom qab ntawd fused siv oxyacetylene torch lossis RF induction coil. Lub fused txheej ntub dej substrate nto los tsim ib txheej uas yog metallurgically sib raug zoo rau lub substrate thiab tsis muaj porosity. Muaj ntau hom alloy siv nrog cov txheej txheem tshuaj tsuag-fuse, qhov tseem ceeb tshaj plaws yog raws li Ni-Cr-B-Si-C alloy system. Nyob ntawm qhov muaj pes tsawg leeg lawv yaj hauv thaj tsam ntawm 980 txog 1200 ° C. 

Weld nyuaj tig yog siv los tso cov tuab tuab heev (1 mus rau 10mm) cov khaubncaws sab nraud povtseg ntawm cov khoom hnav-tiv taus nrog siab zog. Ntau yam kev siv vuam siv tau, suav nrog hlau-inert gas (MIG), tungsten inertgas (TIG), plasma pauv arc (PTA), submerged arc (SAW), thiab phau ntawv hlau arc (MMA). Muaj ntau yam khoom siv txheej txheej tuaj yeem siv tau. Lawv suav nrog cobalt-based alloys (tungsten carbide thiab lwm yam.), martensitic thiab high-speed steels, nickel alloys thiab WC-Co cemented carbides. Tom qab deposition los ntawm ib yam ntawm cov saum toj no welding txheej txheem, nws yog feem ntau tsim nyog los ua kom tiav cov khoom nto.

Hardfacing tuaj yeem tso los ntawm ntau txoj kev vuam:

·Shielded hlau arc vuam

·Gas hlau arc vuam, suav nrog ob qho tib si roj-shielded thiab qhib arc vuam

·Oxyfuel vuam

·Submergedarc vuam

·Electroslag vuam

·Plasma pauv arc vuam, kuj hu ua hmoov plasma vuam

·Thermal txau

·Cold polymer compounds

·Laser cladding

·Hardpoint