Resistance chaw vuam yog txheej txheem siv dav hauv kev tsim khoom, tshwj xeeb tshaj yog nyob rau hauv kev lag luam tsheb, uas nws ua lub luag haujlwm tseem ceeb hauv kev koom nrog cov khoom siv hlau ua ke. Ib qho ntawm cov laj thawj uas tuaj yeem cuam tshuam qhov zoo ntawm qhov chaw welds yog qhov polarity ntawm cov txheej txheem vuam. Hauv tsab xov xwm no, peb yuav tshawb xyuas seb qhov polarity cuam tshuam qhov chaw vuam thiab nws qhov cuam tshuam rau qhov zoo ntawm vuam.
Nkag siab
Resistance chaw vuam, feem ntau tsuas yog hu ua qhov chaw vuam, koom nrog ob lossis ntau dua cov ntawv hlau los ntawm kev siv cua sov thiab siab ntawm cov ntsiab lus tshwj xeeb. Cov txheej txheem no tso siab rau hluav taws xob tsis kam ua kom muaj cua sov tsim nyog rau vuam. Polarity, nyob rau hauv cov ntsiab lus ntawm kev welding tsis kam, yog hais txog kev npaj ntawm vuam tam sim no cov hluav taws xob khiav.
Polarity nyob rau hauv Resistance Spot Welding
Resistance chaw vuam feem ntau siv ib qho ntawm ob lub polarities: ncaj qha tam sim no (DC) electrode tsis zoo (DCEN) lossis ncaj qha tam sim no electrode zoo (DCEP).
- DCEN (Direct Current Electrode Negative):Hauv DCEN welding, lub electrode (feem ntau yog ua los ntawm tooj liab) txuas nrog qhov tsis zoo ntawm lub zog hluav taws xob, thaum lub workpiece txuas nrog lub davhlau ya nyob twg zoo. Qhov kev npaj no coj ntau cua sov rau hauv lub workpiece.
- DCEP (Direct Current Electrode Positive):Hauv DCEP vuam, lub polarity yog thim rov qab, nrog cov electrode txuas nrog lub davhlau ya nyob twg zoo thiab cov khoom ua haujlwm mus rau qhov tsis zoo. Qhov kev teeb tsa no ua rau muaj cua sov ntau ntxiv hauv cov electrode.
Qhov cuam tshuam ntawm Polarity
Kev xaiv ntawm polarity tuaj yeem muaj kev cuam tshuam tseem ceeb ntawm qhov chaw vuam txheej txheem:
- Thaum tshav kub kub Distribution:Raws li tau hais ua ntej, DCEN concentrates ntau cua sov hauv qhov chaw ua haujlwm, ua rau nws haum rau cov khoom siv vuam nrog thermal conductivity ntau dua. DCEP, ntawm qhov tod tes, coj cov cua kub ntau rau hauv cov electrode, uas tuaj yeem ua tau zoo thaum vuam cov ntaub ntawv nrog qis thermal conductivity.
- Electrode Hnav:DCEP nyiam ua rau cov khoom siv hluav taws xob ntau dua piv rau DCEN vim tias muaj cua sov ntau dua hauv cov electrode. Qhov no tuaj yeem ua rau kev hloov hluav taws xob ntau zaus thiab nce nqi khiav haujlwm.
- Weld Quality:Qhov kev xaiv ntawm polarity tuaj yeem cuam tshuam qhov zoo ntawm qhov vuam. Piv txwv li, DCEN feem ntau nyiam rau vuam cov ntaub ntawv nyias vim nws ua rau smoother, tsawg spattered weld nugget. Hauv qhov sib piv, DCEP tuaj yeem pom zoo rau cov ntaub ntawv tuab uas yuav tsum muaj cua sov ntau dua rau kev sib xyaw kom zoo.
Hauv kev xaus, lub polarity xaiv rau qhov chaw vuam ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab qhov zoo thiab cov yam ntxwv ntawm cov vuam. Qhov kev txiav txim siab ntawm DCEN thiab DCEP yuav tsum ua raws li cov khoom xws li cov khoom siv, thickness, thiab cov khoom siv vuam xav tau. Cov neeg tsim khoom yuav tsum ua tib zoo xav txog cov xwm txheej no txhawm rau txhim kho lawv qhov chaw vuam txheej txheem thiab tsim cov khoom zoo, txhim khu kev qha welds hauv ntau daim ntawv thov.
Post lub sij hawm: Sep-23-2023
