Kutulutsa Kutentha ndi Zomwe Zimayambitsa Pamakina a Resistance Spot Welding

Resistance spot welding ndi njira yolumikizirana yomwe imagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana, kuphatikiza magalimoto, ndege, ndi zamagetsi. Panthawi yowotcherera, kutentha kumapangidwa mosalephera, ndipo kupanga kutentha kumeneku kungakhudze kwambiri ubwino ndi kukhulupirika kwa weld. M'nkhaniyi, tiwona njira zopangira kutentha m'makina owotcherera malo ndikuwunika zinthu zazikulu zomwe zimakhudza kutulutsa kwamafuta awa.

Kutentha Generation Mechanisms

Pakuwotcherera malo okana, zitsulo ziwiri kapena kupitilira apo zimalumikizidwa palimodzi pogwiritsa ntchito kukakamiza ndikudutsa magetsi okwera kwambiri polumikizana. Kutentha kumapangidwa makamaka chifukwa cha njira zotsatirazi:

1. Resistance Kutentha: Pamene magetsi akuyenda muzitsulo zazitsulo, kukana kwa zipangizo kumatulutsa kutentha. Kutentha kumeneku kumagwirizana mwachindunji ndi kukana kwa zipangizo ndi malo omwe akudutsa panopa, monga momwe Joule adafotokozera.
2. Contact Resistance: Kukana kukhudzana pakati pa electrode ndi workpiece kumathandizanso pakupanga kutentha. Zimakhudzidwa ndi momwe zimakhalira pamwamba, ukhondo, ndi kupanikizika komwe kumagwiritsidwa ntchito pamalo okhudzana.
3. Kutaya kwa Hysteresis: Muzinthu za ferromagnetic, monga chitsulo, kutayika kwa hysteresis kumachitika chifukwa cha kusintha kwachangu kwa mphamvu ya maginito yomwe imabwera chifukwa cha kusinthasintha kwapano. Kutayika kumeneku kumabweretsa kutentha kwina.

Zinthu Zosonkhezera

Zinthu zingapo zimatha kukhudza kuchuluka kwa kutentha komwe kumapangidwa powotcherera pamalo oletsa:

1. Welding Current: Kuchulukitsa kuwotcherera pakali pano kumapangitsa kuti pakhale kutentha kwakukulu chifukwa cha ubale womwe ulipo pakati papano ndi kutentha.
2. Mphamvu ya Electrode: Mphamvu yapamwamba ya elekitirodi imatha kukulitsa kupanga kutentha powongolera kulumikizana pakati pa ma elekitirodi ndi zida zogwirira ntchito.
3. Electrode Material: Kusankhidwa kwa ma elekitirodi kumatha kukhudza kwambiri m'badwo wa kutentha. Ma elekitirodi opangidwa kuchokera ku zinthu zokhala ndi mphamvu yolimba yamagetsi, monga mkuwa, amakonda kutulutsa kutentha kwambiri.
4. Zida Zogwirira Ntchito: Kukana kwamagetsi kwa zinthu zogwirira ntchito kumagwira ntchito yofunika kwambiri pakupanga kutentha. Zida zokhala ndi kukana kwambiri, monga chitsulo chosapanga dzimbiri, zimatulutsa kutentha kwambiri kuposa zida zotsika, monga aluminiyamu.
5. Nthawi Yowotcherera: Nthawi yayitali yowotcherera imatha kupangitsa kuti kutentha kuchuluke chifukwa kutentha kumakhala ndi nthawi yochulukirapo kuti iwunjike pamawonekedwe a weld.
6. Electrode Tip Geometry: Maonekedwe ndi chikhalidwe cha nsonga za electrode zimakhudza kukana kukhudzana, zomwe zimakhudza kupanga kutentha.

Polimbana ndi kuwotcherera malo, kumvetsetsa njira zopangira kutentha ndi zomwe zimakukokera ndikofunikira kuti mukwaniritse ma welds apamwamba kwambiri. Poyang'anira mosamala magawo monga kuwotcherera pakali pano, mphamvu ya electrode, ndi kusankha zinthu, opanga amatha kuwongolera njira yowotcherera kuti apange zolumikizira zolimba komanso zodalirika pomwe akuchepetsa kuthekera kwa zolakwika zomwe zimachitika chifukwa cha kutentha kwambiri. Kudziwa kumeneku kumathandizira kuti pakhale mphamvu komanso mphamvu zowotcherera malo osiyanasiyana pamafakitale osiyanasiyana.