Chifukwa chiyani ma welds zitsulo zosapanga dzimbiri pogwiritsa ntchito FCAW nthawi zonse amalephera kuyang'ana? David Meyer ndi Rob Koltz amayang'anitsitsa zifukwa zolephera izi.Getty Images
Q: Tikukonza zowotcherera zitsulo zowotcherera mu makina owumitsira m'malo onyowa. Ma welds athu adalephera kuyang'ana chifukwa cha porosity, undercuts ndi welds osweka.Timawotcherera A514 ku A36 pogwiritsa ntchito 0.045 ″ m'mimba mwake, malo onse, cored 309L, 75% Argon kuvala bwino.
Tinayesa ma electrodes a carbon steel, koma ma welds anatha mofulumira kwambiri ndipo tinapeza zitsulo zosapanga dzimbiri kuti zigwire bwino.Zonse zowotcherera zimachitidwa pamalo athyathyathya ndipo ndi 3 / 8 "utali. Chifukwa cha zovuta za nthawi, zowotcherera zonse zinachitidwa nthawi imodzi.Nchiyani chingayambitse ma welds athu kulephera?
Kuwotcherera kwapansi nthawi zambiri kumachitika chifukwa chowotcherera mosadziwika bwino, njira yowotcherera yolakwika, kapena zonse ziwiri.
Popeza wowotcherera akuyesera kuyika 3/8 ". Kuthekera kogwiritsa ntchito nyaliyo kungathe kukhala ndi udindo wina wowotcherera wa fillet imodzi yokhala ndi waya waing'ono wa flux-cored waya.
Porosity imayamba chifukwa cha zonyansa mu weld, kutayika kapena kuchulukira kwa gasi wotchinga, kapena kuyamwa kwa chinyezi chambiri cha waya wamtundu wa flux-cored.Mukunena kuti iyi ndi ntchito yokonza pa media yonyowa mkati mwa chowumitsira, kotero ngati ma welds satsukidwa bwino, izi zitha kukhala chifukwa chachikulu cha voids.
Chitsulo chazitsulo chomwe mumagwiritsa ntchito ndi waya wa flux cored, mitundu ya wayayi imakhala ndi dongosolo lozizira kwambiri la slag. Izi ndizofunikira kuti zithandizire matope a weld pamene mukuwotchera molunjika mmwamba kapena pamwamba.Kuipa kwa slag yofulumira kuzizira ndikuti imakhazikika pamaso pa dziwe la weld pansi pake. ndi waya wocheperako ndikuyesera kuyika chowotcherera chachikulu pakadutsa kamodzi, monga momwe mumagwiritsira ntchito.
Kuphulika kwa weld kumayambiriro ndi kuyimitsidwa kwa weld kungayambitsidwe ndi zifukwa zingapo.Popeza mukuyika mkanda waukulu ndi waya waung'ono wazing'ono, mumatha kukhala ndi kusakanikirana kosakwanira (LOF) pa muzu wa weld. Weld cracking ndi chinthu chodziwika bwino chifukwa cha kupsinjika kwakukulu kotsalira kwa weld ndi LOF pa mizu.
Kwa kukula kwa waya uku, muyenera kugwiritsa ntchito maulendo awiri kapena atatu kuti mutsirize 3/8 ya inchi. Fillet welds, palibe.Mungathe kuzipeza mofulumira kuti mupange ma welds opanda chilema atatu kusiyana ndi kupanga weld chopanda cholakwika ndiyeno muyenera kukonza.
Komabe, nkhani ina yomwe ingakhale ndi gawo lalikulu pakuwotcherera kowotcherera ndi kuchuluka kolakwika kwa ferrite mu weld, yomwe nthawi zambiri imakhala chifukwa chachikulu chophwanyira waya.309L idapangidwa kuti ikhale yowotcherera zitsulo zosapanga dzimbiri ku chitsulo cha carbon m'malo mwa chitsulo cha carbon steel kupita ku carbon steel. kuchuluka kovomerezeka kwa ferrite.Kugwiritsa ntchito zitsulo zodzaza ndi pafupifupi 50% ferrite, monga 312 kapena 2209, zidzathetsa kuthekera kwa kusweka chifukwa cha kuchepa kwa ferrite.
Njira yabwino kwambiri yoperekera kukana kuvala kwabwino kwambiri ndikuwotcherera cholumikizira ndi electrode ya kaboni kapena chitsulo chosapanga dzimbiri ndiyeno kuwonjezera wosanjikiza wa electrode yapamtunda.
Yesani kutembenukira ku waya wokulirapo, monga 1/16 inchi kapena yokulirapo. Kugwiritsa ntchito waya wotetezedwa ndi mpweya wotetezedwa ndi mpweya ndikoyenera chifukwa kumapereka kuyeretsa bwino kwa weld komanso kutetezedwa bwino kwa mpweya kuposa waya wopanda waya. 2209.
WELDER, yemwe kale ankatchedwa Practical Welding Today, akusonyeza anthu enieni amene amapanga zinthu zimene timagwiritsa ntchito komanso ntchito tsiku lililonse. Magaziniyi yakhala ikuthandiza anthu ku North America kwa zaka 20.
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