Porosity, discontinuities-mtundu wa patsekeke wopangidwa ndi kutsekeka kwa mpweya panthawi yolimba, ndi vuto lodziwika bwino koma lovuta kwambiri pakuwotcherera kwa MIG komanso lomwe limayambitsa zingapo. Itha kuwoneka m'magawo odziyimira pawokha kapena ma robotic ndipo imafuna kuchotsedwa ndi kukonzanso nthawi zonse ziwiri - zomwe zimapangitsa kuti nthawi yocheperako komanso kuchuluka kwa ndalama.
Choyambitsa chachikulu cha porosity mu kuwotcherera zitsulo ndi nayitrogeni (N2), yomwe imalowa mu dziwe lowotcherera. Pamene dziwe lamadzimadzi likazizira, kusungunuka kwa N2 kumachepetsedwa kwambiri ndipo N2 imatuluka muzitsulo zosungunuka, kupanga thovu (pores). Mu kuwotcherera malata/galvanneal, zinki wamphumphu amatha kugwedezeka mu dziwe lowotcherera, ndipo ngati palibe nthawi yokwanira yothawira dziwe lisanalimba, limapanga porosity. Pa kuwotcherera aluminium, porosity yonse imayamba ndi haidrojeni (H2), monga momwe N2 imagwirira ntchito muzitsulo.
Kuwotcherera porosity kumatha kuwoneka kunja kapena mkati (nthawi zambiri amatchedwa sub-surface porosity). Itha kukhalanso pamalo amodzi pa weld kapena kutalika konse, zomwe zimapangitsa kuti pakhale ma welds ofooka.
Kudziwa momwe mungadziwire zifukwa zazikulu za porosity ndi momwe mungawathetsere mwamsanga kungathandize kupititsa patsogolo khalidwe, zokolola komanso mfundo.
Kusakwanira Kwa Gasi Woteteza
Kusatetezedwa bwino kwa gasi ndizomwe zimayambitsa kuwotcherera porosity, chifukwa zimalola kuti mpweya wa mumlengalenga (N2 ndi H2) uipitse dziwe la weld. Kupanda kuphimba koyenera kumatha kuchitika pazifukwa zingapo, kuphatikiza koma osangokhala ndi kuchuluka kwa gasi wotetezedwa bwino, kutayikira munjira ya gasi, kapena kutuluka kwa mpweya wambiri mu cell yowotcherera. Mayendedwe othamanga kwambiri angakhalenso olakwa.
Ngati wogwiritsa ntchito akuganiza kuti kusayenda bwino kumayambitsa vutoli, yesani kusintha mita ya gasi kuti muwonetsetse kuti mtengowo ndi wokwanira. Mukamagwiritsa ntchito njira yosinthira kupopera, mwachitsanzo, kuyenda kwa 35 mpaka 50 cubic feet pa ola (cfh) kuyenera kukhala kokwanira. Kuwotcherera pazitsulo zokwera kumafuna kuwonjezereka kwa kayendedwe kake, koma ndikofunikira kuti musakhazikitse mlingo wokwera kwambiri. Izi zitha kuyambitsa chipwirikiti pamapangidwe amfuti omwe amasokoneza chitetezo cha gasi.
Ndikofunikira kudziwa kuti mfuti zopangidwira mosiyanasiyana zimakhala ndi mawonekedwe osiyanasiyana akuyenda kwa gasi (onani zitsanzo ziwiri pansipa). "Malo okoma" a kuchuluka kwa mpweya wa gasi pamapangidwe apamwamba ndi aakulu kwambiri kuposa momwe amapangidwira pansi. Ichi ndi chinthu chomwe injiniya wowotcherera ayenera kuganizira akakhazikitsa cell yowotcherera.
Kupanga 1 kumawonetsa kuyenda kosalala kwa gasi pamalo otuluka
Design 2 ikuwonetsa kutuluka kwamphamvu kwa gasi pamalo otulutsira mphuno.
Onaninso kuwonongeka kwa payipi ya gasi, zopangira ndi zolumikizira, komanso mphete za O pa pini yamphamvu ya mfuti yowotcherera ya MIG. Bwezerani ngati pakufunika.
Mukamagwiritsa ntchito mafani kuti aziziziritsa oyendetsa kapena magawo mu selo yowotcherera, samalani kuti asalozedwe mwachindunji pamalo owotcherera pomwe angasokoneze kufalikira kwa gasi. Ikani chophimba mu weld cell kuti muteteze ku kutuluka kwa mpweya wakunja.
Gwiritsirani ntchito pulogalamu yamaloboti kuti muwonetsetse kuti pali mtunda woyenera woti mugwire ntchito, womwe nthawi zambiri umakhala ½ mpaka 3/4 inchi, kutengera kutalika komwe mukufuna.
Pomaliza, kuyenda pang'onopang'ono ngati porosity ikupitilira kapena funsani wopereka mfuti wa MIG pazinthu zosiyanasiyana zakutsogolo zokhala ndi chophimba bwino cha gasi.
Base Metal Contamination
Kuwonongeka kwachitsulo ndi chifukwa china chomwe chimayambitsa porosity - kuchokera ku mafuta ndi mafuta kupita ku mphero ndi dzimbiri. Chinyezi chikhoza kulimbikitsanso izi, makamaka pakuwotcherera kwa aluminiyamu. Mitundu iyi ya zonyansa nthawi zambiri imatsogolera ku porosity yakunja yomwe imawonekera kwa wogwiritsa ntchito. Chitsulo chopangidwa ndi galvanized chimakonda kukhala ndi subsurface porosity.
Pofuna kuthana ndi porosity yakunja, onetsetsani kuti mwayeretsa bwino zinthu zoyambira musanayambe kuwotcherera ndikuganizira kugwiritsa ntchito waya wowotcherera wachitsulo. Waya wamtundu uwu uli ndi ma deoxidizers apamwamba kuposa waya wolimba, kotero umalekerera zonyansa zilizonse zomwe zatsala pazoyambira. Nthawi zonse sungani mawaya awa ndi ena aliwonse pamalo ouma, aukhondo ofanana kapena okwera pang'ono kuposa mbewuyo. Kuchita izi kumathandizira kuchepetsa kuyanika komwe kungayambitse chinyezi mu dziwe la weld ndikuyambitsa porosity. Osasunga mawaya m'nkhokwe yozizira kapena panja.
Porosity, discontinuities-mtundu wa patsekeke wopangidwa ndi kutsekeka kwa mpweya panthawi yolimba, ndi vuto lodziwika bwino koma lovuta kwambiri pakuwotcherera kwa MIG komanso lomwe limayambitsa zingapo.
Pamene kuwotcherera kanasonkhezereka zitsulo, nthaka vaporizes pa kutentha otsika kuposa chitsulo amasungunula, ndipo mofulumira kuyenda liwiro amakonda kupanga weld dziwe amaundana mwamsanga. Izi zimatha kutsekereza mpweya wa zinc muzitsulo, zomwe zimapangitsa kuti pakhale porosity. Yesetsani kuthana ndi vutoli powunika kuthamanga kwaulendo. Apanso, lingalirani mwapadera (flux formula) waya wazitsulo wazitsulo womwe umathandizira kuti nthunzi ya zinki ituluke mu dziwe lowotcherera.
Ma Nozzles Otsekedwa ndi / kapena Ocheperako
Ma nozzles otsekedwa ndi/kapena ocheperako angayambitsenso porosity. Wowotchera spatter amatha kukhazikika mumphuno ndi pamwamba pa nsonga yolumikizirana ndi cholumikizira chomwe chimatsogolera kutsekereza kutuluka kwa gasi kapena kupangitsa kuti ikhale yaphokoso. Zonse ziwiri zimasiya dziwe la weld ndi chitetezo chokwanira.
Chowonjezera izi ndi mphuno yomwe ndi yaying'ono kwambiri kuti isagwiritsidwe ntchito komanso yomwe imakonda kupangika mwachangu komanso mwachangu. Tizilombo tating'onoting'ono titha kupereka mwayi wolumikizana bwino, komanso kulepheretsa kuyenda kwa gasi chifukwa cha malo ang'onoang'ono omwe amalola kuti gasi aziyenda. Nthawi zonse kumbukirani kusinthasintha kwa nsonga yolumikizirana ndi chomata (kapena kupuma), chifukwa ichi chitha kukhala chinthu china chomwe chimakhudza kuteteza kutuluka kwa mpweya ndi porosity ndi kusankha kwanu kwa nozzle.
Poganizira izi, onetsetsani kuti nozzleyo ndi yayikulu mokwanira kuti mugwiritse ntchito. Nthawi zambiri, mapulogalamu okhala ndi mawotchi okwera kwambiri ogwiritsa ntchito mawaya akulu amafunikira mphuno yokulirapo.
Mukamagwiritsa ntchito kuwotcherera kwa theka-automatic, nthawi ndi nthawi yang'anani ngati sipatter yowotcherera mu mphuno ndikuchotsa pogwiritsa ntchito zowotcherera (welpers) kapena m'malo mwake ngati kuli kofunikira. Pakuwunikaku, tsimikizirani kuti nsonga yolumikizirana ili bwino komanso kuti chotulutsa mpweya chili ndi madoko omveka bwino. Othandizira amathanso kugwiritsa ntchito anti-spatter komputa, koma akuyenera kusamala kuti asaviyike mphunoyo motalikirapo kapena motalika kwambiri, chifukwa kuchuluka kwapawiriko kumatha kuyipitsa mpweya wotchinga ndikuwononga kutsekereza kwa nozzle.
Pogwiritsa ntchito kuwotcherera kwa robotic, ikani ndalama pamalo oyeretsera ma nozzles kapena reamer kuti muthane ndi kuchuluka kwa spatter. Zotumphukira izi zimatsuka mphuno ndi diffuser panthawi yopuma nthawi zonse popanga kuti zisakhudze nthawi yozungulira. Malo oyeretsera ma nozzles amapangidwa kuti azigwira ntchito limodzi ndi anti-spatter sprayer, yomwe imagwiritsa ntchito chovala chopyapyala chapawiri pazigawo zakutsogolo. Kuchuluka kapena kuchepera kwa anti-spatter fluid kungayambitse porosity yowonjezera. Kuonjezera kuphulika kwa mpweya ku njira yoyeretsera nozzle kungathandizenso kuchotsa spatter yotayirira kuchokera kuzinthu zogwiritsira ntchito.
Kusunga khalidwe ndi zokolola
Posamalira kuwunika momwe kuwotcherera ndi kudziwa zomwe zimayambitsa porosity, ndizosavuta kukhazikitsa njira zothetsera. Kuchita izi kungathandize kuwonetsetsa kuti nthawi yayitali kwambiri, zotsatira zabwino ndi zina zambiri zomwe zikuyenda pakupanga.
Nthawi yotumiza: Feb-02-2020
