Vuam txoj kev

Vuam thev naus laus zis feem ntau yog siv rau cov khoom siv hlau, feem ntau suav nrog arc vuam, argon arc vuam, CO2 shielded vuam, oxygen acetylene vuam, laser vuam, hluav taws xob slag siab vuam, thiab lwm yam. Cov ntaub ntawv tsis yog xim hlau xws li plastics kuj tuaj yeem welded. Muaj ntau tshaj 40 hom hlau vuam txoj kev, feem ntau muab faib ua peb pawg: fusion vuam, siab vuam, thiab brazing.
Fusion welding yog ib txoj hauv kev ua kom sov lub workpiece interface mus rau lub xeev molten thaum lub sij hawm vuam txheej txheem, tsis siv lub siab los ua kom tiav qhov vuam. Thaum lub sij hawm fusion welding, lub tshav kub kub sai sai thiab melts lub interface ntawm ob workpieces yuav tsum tau welded, tsim ib tug molten pas dej ua ke. Lub pas dej molten txav mus rau pem hauv ntej nrog lub tshav kub thiab tsim ib qho txuas txuas ntxiv tom qab txias, txuas ob lub workpieces rau hauv ib qho.
Siab vuam yog cov txheej txheem ntawm kev ua tiav atomic bonding ntawm ob lub workpieces nyob rau hauv ib tug khoom lub xeev nyob rau hauv lub siab, los yog hu ua solid-state welding. Cov txheej txheem kev siv lub siab welding feem ntau yog welding kuj. Thaum tam sim no dhau los ntawm qhov kev sib txuas kawg ntawm ob lub workpieces, qhov kub thiab txias nce vim qhov ua haujlwm siab. Thaum rhuab mus rau lub xeev yas, qhov kev sib txuas ua ke nyob rau hauv axial siab.
Brazing yog ib txoj kev vuam uas siv cov khoom siv hlau nrog qhov qis qis dua li cov khoom ua haujlwm raws li cov khoom siv brazing. Cov khoom ua haujlwm thiab cov khoom siv brazing yog rhuab mus rau qhov kub siab tshaj qhov melting point ntawm cov khoom siv brazing tab sis qis dua qhov melting point ntawm workpiece. Cov khoom siv ua kua brazing yog siv los ntub cov khoom ua haujlwm, sau qhov sib txawv ntawm qhov sib txawv, thiab ua tiav atomic diffusion nrog lub workpiece, yog li ua tiav vuam.
Qhov sib koom ua ke tsim thaum lub sij hawm vuam uas txuas ob lub cev sib txuas yog hu ua weld seam. Ob sab ntawm lub vuam seam yuav raug welding thaum lub sij hawm vuam, ua rau muaj kev hloov hauv microstructure thiab cov khoom. Thaj chaw no yog hu ua tshav kub cuam tshuam. Thaum vuam, vim qhov sib txawv ntawm cov khoom siv ua haujlwm, cov khoom siv vuam, vuam tam sim no, thiab lwm yam, overheating, embrittlement, quenching los yog softening yuav tshwm sim nyob rau hauv weld seam thiab tshav kub cuam tshuam cheeb tsam tom qab vuam, uas tuaj yeem ua rau txo qis hauv kev ua tau zoo. welded ib feem thiab deteriorate lub weldability. Qhov no yuav tsum tau kho lub vuam tej yam kev mob. Preheating qhov sib txuas ntawm vuam ua ntej vuam, rwb thaiv tsev thaum vuam, thiab tom qab vuam cua sov kho tuaj yeem txhim kho qhov vuam zoo ntawm vuam.