Welded steel yeeb nkab yog hais txog cov yeeb nkab steel nrog seams rau ntawm qhov chaw uas yog tsim los ntawm kev khoov steel strips los yog steel daim hlau rau hauv puag ncig, square, thiab lwm yam duab thiab ces welding lawv. Lub billet siv rau welded steel kav yog steel phaj los yog sawb hlau. Txij li thaum xyoo 1930s, nrog rau kev txhim kho sai ntawm cov khoom siv zoo tshaj plaws ntawm cov hlau txuas txuas ntxiv thiab kev nce qib ntawm vuam thiab tshuaj xyuas tshuab, qhov zoo ntawm welds tau raug txhim kho tas li, ntau yam thiab cov ntsiab lus ntawm welded steel kav tau nce, thiab lawv tau hloov. seamless steel kav hauv ntau thiab ntau qhov chaw. Welded steel kav muaj cov nqi qis dua thiab ua haujlwm ntau dua li cov kav dej seamless.

Cov yeeb nkab steel tau muab faib ua seamless thiab welded kav. Cov kav dej welded tau muab faib ua cov kav hlau ncaj nraim thiab cov kav hlau kav. Ncaj seam welded kav yog muab faib ua ERW steel yeeb nkab (high-frequency resistance welding) thiab LSAW steel yeeb nkab (ncaj seam submerged arc vuam). Cov txheej txheem welding ntawm kauv kav kuj yog qhov sib txawv ntawm submerged arc vuam (SSAW steel yeeb nkab luv luv) thiab LSAW steel yeeb nkab nyob rau hauv daim ntawv ntawm welds, thiab qhov sib txawv nrog ERW yog qhov sib txawv ntawm cov txheej txheem vuam. Submerged arc vuam (SAW steel yeeb nkab) yuav tsum muaj qhov sib ntxiv ntawm qhov nruab nrab (vuam hlau, flux), tab sis ERW tsis xav tau nws. ERW yog melted los ntawm nruab nrab zaus cua sov. Cov kav hlau tuaj yeem muab faib ua ob pawg raws li txoj kev tsim khoom: seamless steel kav thiab welded steel kav. Seamless steel kav tuaj yeem muab faib ua cov kav dej kub dov seamless, cov kav dej txias txias, cov kav hlau steel, cov kav dej kub nthuav dav, cov kav dej txias txias, thiab cov kav dej extruded raws li txoj kev tsim khoom. Seamless steel kav yog ua los ntawm cov pa roj carbon zoo los yog hlau alloy thiab muab faib ua kub dov thiab txias dov (kos).

Cov txheej txheem ntau lawm ntawm cov kav dej ncaj seam welded yog yooj yim, nrog kev ua haujlwm siab, tus nqi qis, thiab kev loj hlob sai. Lub zog ntawm kauv welded kav feem ntau yog siab tshaj qhov ncaj seam welded kav. Cov pob zeb me me tuaj yeem siv los tsim cov kav dej welded nrog cov kab uas loj dua, thiab cov ntawv loj ntawm tib qhov dav kuj tuaj yeem siv los tsim cov kav dej sib txawv. Txawm li cas los xij, piv nrog cov kav dej ncaj nraim ntawm tib qhov ntev, qhov ntev ntawm qhov vuam nce los ntawm 30 ~ 100%, thiab qhov ceev ntau lawm yog qis dua. Yog li ntawd, me me-inch welded kav feem ntau welded los ntawm ncaj seam welding, thaum loj txoj kab uas hla welded kav feem ntau welded los ntawm kauv vuam.