Lub submerged arc vuam cheeb tsam yog nquag mus rau qhov tsis xws luag xws li porosity, kub tawg, thiab undercutting.
Porosity: Porosity feem ntau tshwm sim nyob rau hauv nruab nrab ntawm lub weld hlaws. Qhov laj thawj tseem ceeb yog tias hydrogen tseem muab zais rau hauv cov hlau txuas hauv daim ntawv ntawm npuas. Yog li ntawd, kev ntsuas los tshem tawm qhov tsis xws luag yog thawj zaug tshem tawm xeb, roj, noo noo, thiab dampness ntawm vuam hlau thiab vuam seam. Qhov thib ob, nws yog ib qho tseem ceeb kom qhuav cov flux kom tshem tawm cov dej noo. Tsis tas li ntawd, nce qhov tam sim no, txo qhov vuam ceev, thiab ua kom lub zog ntawm cov hlau molten qeeb kuj yog txoj hauv kev zoo.
Sulfur Cracking (Cracks Ua los ntawm Sulfur): Thaum vuam daim hlau uas muaj zog sulfur segregation zones (tshwj xeeb tshaj yog mos rimmed steel), sulfides nyob rau hauv cov cheeb tsam no tuaj yeem nkag mus rau hauv cov hlau vuam, ua rau tawg. Yog vim li cas yog qhov muaj cov hlau tsis tshua muaj melting point sulfides nyob rau hauv cov sulfur segregation zones thiab hydrogen nyob rau hauv cov hlau. Txhawm rau tiv thaiv qhov no, siv cov hlau semi-tua lossis tua cov hlau nrog tsawg dua sulfur segregation zones yog siv tau. Tsis tas li ntawd, xyuas kom huv si thiab qhuav ntawm qhov chaw weld thiab flux kuj tseem tsim nyog.
Kub Cracks: Nyob rau hauv submerged arc vuam, kub tawg tuaj yeem tshwm sim hauv cov hlaws vuam, tshwj xeeb tshaj yog nyob rau ntawm arc pib thiab nres craters. Txhawm rau tshem tawm cov kab nrib pleb no, cov phaj nraub qaum feem ntau yog ntsia ntawm lub arc pib thiab nres cov ntsiab lus. Thaum welding kauv kav, thim rov qab cov yeeb nkab thiab sib tshooj ntawm qhov kawg ntawm cov kauj vuam sib txuas kuj tuaj yeem pab tau. Kub tawg yog feem ntau yuav tshwm sim thaum lub weld kev nyuaj siab siab los yog thaum lub silicon (Si) cov ntsiab lus nyob rau hauv weld hlau yog siab.
Kev suav ntawm Slag: Kev suav nrog slag yog hais txog qhov seem ntawm slag nyob rau hauv cov hlau weld.
Kev nkag mus tsis txaus: Qhov no tshwm sim thaum qhov sib tshooj ntawm cov hlau txuas sab hauv thiab sab nraud tsis txaus, qee zaum ua rau nkag mus tsis tiav. Qhov mob no yog hu ua kev nkag mus tsis txaus.
Undercutting: Undercutting yog tsim ntawm V-shaped zawj raws qhov nruab nrab ntawm qhov vuam ntawm nws ntug. Nws tshwm sim vim qhov tsis tsim nyog vuam ceev, tam sim no, thiab qhov chaw voltage. Ntawm cov xwm txheej no, kev siv vuam ceev ntau dhau yuav ua rau muaj kev cuam tshuam ntau dua li qhov tsis tsim nyog tam sim no. Qhov tshwm sim ntawm undercutting nyob rau hauv kauv kav yog siab tshaj nyob rau hauv dav submerged arc ncaj seam welded kav vim lawv txawv configuration.
