Qhov chaw vuam txheej txheem muaj xws li: tig rau cov dej txias; ntxuav lub ntsej muag ntawm lub workpieces, sib sau ua ke kom raug, thiab tom qab ntawd muab tso rau ntawm cov khoom siv hluav taws xob sab saud thiab sab qis, siv lub siab los xyuas kom muaj kev sib cuag zoo; thov tam sim no los ua kom sov qhov chaw sib cuag ntawm ob lub workpieces, ua rau lub zos melting thiab tsim ib tug weld nugget; tswj lub siab tom qab lub hwj chim raug txiav tawm kom tso cai rau lub weld nugget kom txias thiab solidify nyob rau hauv siab, tsim ib tug weld chaw; tshem tawm lub siab thiab tshem tawm lub workpiece. Spot vuam txheej txheem tsis xws li vuam tam sim no, electrode siab, lub sij hawm energizing, thiab electrode ua hauj lwm nto qhov ntev muaj qhov cuam tshuam loj rau vuam zoo.
Lub tshuab vuam tshuab siv lub siab -kub arc generated thaum qhov zoo thiab qhov tsis zoo electrodes yog luv luv -circuited rau yaj cov ntaub ntawv uas yuav tsum tau welded ntawm cov electrodes, ua tiav lub hom phiaj ntawm kev sib txuas lawv. Cov qauv ntawm ib qho chaw vuam tshuab yog yooj yim heev; qhov tseem ceeb, nws yog lub siab - fais fab transformer uas hloov 220V AC lub zog mus rau qhov qis -voltage, siab - tam sim no fais fab mov, uas tuaj yeem yog DC lossis AC. Vuam transformers muaj ib tug tshwj xeeb yam ntxwv: ib tug ceev voltage poob.
Tom qab lub vuam pas nrig yog ignited, lub voltage poob. Kev ua hauj lwm voltage ntawm lub vuam tshuab yog kho tsis tau tsuas yog los ntawm thawj 220/380V voltage hloov dua siab tshiab, tab sis kuj los ntawm kais dej ntawm lub thib ob kauj. Adjustable hlau cores kuj muaj. Lub tshuab vuam feem ntau yog lub siab - fais fab transformer, tsim siv lub hauv paus ntsiab lus ntawm inductance. Lub inductance tsim ib qho kev hloov pauv loj loj thaum hloov mus rau thiab tawm. Lub siab -voltage arc generated los ntawm instantaneous luv luv Circuit Court ntawm tus ncej zoo thiab tsis zoo melts cov khoom siv vuam ntawm lub vuam pas nrig, ua tiav lub hom phiaj ntawm kev koom nrog lawv.
Spot welding yog ib txoj kev ua haujlwm vuam uas cov khoom siv tau sib sau ua ke thiab nias ntawm ob lub electrodes. Resistance tshav kub yog siv los yaj lub hauv paus hlau, ua ib tug weld point. Spot welding feem ntau yog siv rau kev sib koom ua ke nyias daim hlau, xws li daim tawv nqaij dav hlau, dav hlau cav smokestacks, thiab tsheb cab shells. Lub vuam transformer nyob rau hauv ib qho chaw vuam tshuab yog qhov chaw vuam cov khoom siv hluav taws xob; nws qhov thib ob winding muaj tsuas yog ib lub voj. Cov electrodes sab sauv thiab qis thiab cov caj npab electrode yog siv los ua cov vuam tam sim no thiab xa hluav taws xob. Cov dej txias yuav tsum dhau los ntawm lub tshuab hluav taws xob, hluav taws xob, thiab lwm yam, txhawm rau tiv thaiv overheating thaum vuam. Cov dej txias yuav tsum tau muab ua ntej, tom qab ntawd lub hwj huam hloov yuav tsum tau qhib. Qhov zoo ntawm cov electrodes ncaj qha cuam tshuam rau cov txheej txheem vuam, vuam zoo, thiab cov khoom tsim tau. Cov khoom siv hluav taws xob feem ntau siv suav nrog tooj liab, cadmium bronze, thiab chromium bronze; Cov duab electrode sib txawv, feem ntau txiav txim siab los ntawm cov duab ntawm lub workpiece. Thaum txhim kho electrodes, xyuas kom meej lub sab sauv thiab sab electrode nto yog tib yam; cov electrode nto yuav tsum tau ceev kom huv si, feem ntau siv cov ntawv xuab zeb los yog cov ntaub ntawv kom tiav. Lub voj voog vuam rau qhov chaw vuam thiab qhov projection vuam muaj plaub theem pib (qhov chaw vuam txheej txheem):
(1) Ua ntej- theem siab-Cov electrode nqis mus rau qhov tam sim no- ntawm theem, xyuas kom cov electrode nias ruaj khov rau cov khoom ua haujlwm, tsim kom muaj kev sib haum xeeb ntawm cov khoom ua haujlwm.
(2) Vuam lub sij hawm-Lub vuam tam sim no dhau los ntawm cov khoom ua haujlwm, ua kom muaj cua sov los ua cov khoom siv vuam.
(3) Tuav lub sij hawm-Lub vuam tam sim no raug txiav tawm, thiab cov electrode siab tseem nyob twj ywm kom txog rau thaum lub weld nugget solidifies kom muaj zog txaus.
(4) Lub sijhawm so-Txij li lub sijhawm lub tshuab hluav taws xob pib nce mus txog thaum nws pib nqis dua, lub voj voog txuas txuas ntxiv pib.
Txhawm rau txhim kho kev ua haujlwm ntawm cov pob qij txha welded, qee zaum yuav tsum tau ntxiv ib lossis ntau ntawm cov hauv qab no rau lub voj voog yooj yim:
(1) Ua kom muaj preload kom tshem tawm qhov sib txawv ntawm cov workpieces tuab, kom ntseeg tau tias haum.
(2) Siv cov pulses preheating los txhim kho cov yas ntawm cov hlau, ua kom yooj yim rau cov workpieces kom haum nruj thiab tiv thaiv spatter; nyob rau hauv qhov projection welding, qhov no ua kom ntseeg tau tias ntau qhov projections nyob rau hauv kev sib cuag nrog lub phaj ua ntej vuam, lav zoo ib yam cua sov ntawm txhua qhov chaw.