Internal welding yog nqa tawm los ntawm kev txuas lub vuam tshuab caj npab mus rau sab hauv ntawm cov yeeb nkab steel ntawm qhov nrug deb ntawm qhov kev sib koom tes uas cov hlau sawb tsim. Ob leeg sab hauv thiab sab nraud welding txais yuav tsis siv neeg ib leeg-xaim submerged arc vuam txoj kev nrog ncaj qha tam sim no rov qab polarity.
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