Thaum lub sij hawm vuam txheej txheem, yog tias muaj kev nyuaj siab ntawm lub vuam ntug, ua rau lub vuam seam qis dua cov khoom siv hauv paus, qhov kev nyuaj siab no hu ua qhov tsis xws luag. Muaj ntau yam laj thawj rau undercut defects. Kev siv vuam ceev heev los yog siv cov vuam siv hluav taws xob siab thaum lub sij hawm vuam txheej txheem, uas txhim kho cov arc, tuaj yeem ua rau muaj qhov tshwm sim ntawm qhov tsis xws luag. Tsis tas li ntawd, vuam qhov sib txawv ntawm qhov sib txawv vim muaj teeb meem nrog lub tshuab vuam lub vuam hlaws thaum lub sij hawm vuam txheej txheem tuaj yeem ua rau nws nyuaj rau vuam hlau kom rov ua dua, ua rau muaj qhov tshwm sim hnyav dua. Yog li ntawd, thaum lub sij hawm muab kauv steel yeeb nkab vuam ua haujlwm, nws yog ib qho tseem ceeb kom tsis txhob muaj qhov tshwm sim ntawm undercut defects ntau li ntau tau.
Cov kev daws teeb meem tseem ceeb rau kev tsis xws luag yog los tswj cov vuam tam sim no kom zoo, uas tuaj yeem tiv thaiv qhov tshwm sim ntawm qhov tsis xws luag. Los ntawm kev tswj cov vuam tam sim no, stabilizing lub arc ntev, thiab tswj kev sib tsoo vuam ceev, qhov tshwm sim undercut tshwm sim los ntawm qhov tsis ruaj tsis khov vuam ceev tuaj yeem zam tau. Thaum lub sij hawm hloov ntawm vuam tsis, nws tseem yuav tsum tau ua tib zoo xyuas cov tsis. Lub inclination lub kaum sab xis ntawm vuam electrode yuav tsum phim cov kev mus los ceev kom muaj peev xwm txhim kho vuam zoo. Nyob rau tib lub sijhawm, kev saib xyuas yuav tsum tau them nyiaj rau kev tshuaj xyuas qhov vuam seam thiab daws cov teeb meem tam sim ntawd.
