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 mu makina owumitsira m'malo onyowa. Ma welds athu adalephera kuwunika 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 kumachitika chifukwa cha njira zowotcherera mosadziwika bwino, njira zowotcherera zosayenera, kapena zonse ziwiri.
Popeza wowotcherera akuyesera kuyika 3/8″. Kuthekera kogwiritsa ntchito nyali mopitilira muyeso kutha kukhala ndi udindo wowotcherera wa single-pass fillet ndi waya yaying'ono ya 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 chodzaza chomwe mumagwiritsa ntchito ndi waya wa flux cored wire, mawaya awa ali ndi dongosolo lozizira kwambiri lozizira kwambiri. Izi ndizofunikira kuti zithandizire thabwa la weld powotcherera molunjika mmwamba kapena pamwamba. Zoyipa za slag yowotchera mwachangu ndikuti zimalimba pamaso pa dziwe lomwe lili pansi pake. kuwotcherera pamalo athyathyathya ndi waya wocheperako ndikuyesera kuyika chowotcherera chachikulu ndikudutsa 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.Nkhani yeniyeni ya weld ya mankhwalawa imaganiziranso kusungunuka kwachitsulo kwa makolo onse awiri zitsulo. kupangidwa kwa mankhwala ndi kupanga ndalama zovomerezeka za ferrite.Kugwiritsa ntchito zitsulo zodzaza ndi pafupifupi 50% ferrite, monga 312 kapena 2209, zidzathetsa kuthekera kwa kusweka chifukwa cha ferrite yochepa.
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 kusinthira 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 kuteteza mpweya wabwino kuposa waya wopanda waya. 312 kapena 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.
Tsopano ndi mwayi wofikira ku mtundu wa digito wa The FABRICATOR, mwayi wosavuta kuzinthu zamakampani.
Magazini ya digito ya The Tube & Pipe Journal tsopano ikupezeka bwino, ikupereka mwayi wosavuta kuzinthu zofunikira zamakampani.
Sangalalani ndi mwayi wofikira ku STAMPING Journal ya digito, yomwe imapereka kupita patsogolo kwaukadaulo kwaposachedwa, machitidwe abwino kwambiri komanso nkhani zamakampani pamsika wopondaponda zitsulo.
Tsopano ndi mwayi wofikira kukope la digito la The Fabricator en Español, mwayi wosavuta kuzinthu zamakampani zamtengo wapatali.