Txoj kev loj hlob ntawm cov yeeb nkab steel tsim tshuab pib nrog kev nce ntawm kev lag luam tsheb kauj vab, kev loj hlob ntawm cov roj av nyob rau hauv lub xyoo pua 19th, kev tsim cov nkoj, boilers, thiab aircraft thaum lub sij hawm ob ntiaj teb ua tsov ua rog, kev tsim cov thermal fais fab boilers tom qab lub Kev Tsov Rog Thoob Ntiaj Teb thib Ob, kev txhim kho tshuaj lom neeg kev lag luam, thiab kev txhim kho tshuaj lom neeg kev lag luam. Kev drilling thiab kev thauj mus los ntawm cov roj thiab cov nkev roj tau txhawb nqa txoj kev loj hlob ntawm steel yeeb nkab kev lag luam nyob rau hauv cov nqe lus ntawm ntau yam, tso zis thiab zoo. Feem ntau, cov kav dej steel tau muab faib ua ob hom: seamless steel kav thiab welded steel kav raws li txoj kev tsim khoom. Lub sij hawm no, peb yuav qhia txog welded steel kav.
Welded steel kav yog seam steel kav, uas yog tsim los ntawm khoov lub raj billet (steel phaj thiab steel sawb) mus rau hauv ib lub raj ntawm qhov yuav tsum tau cross-sectional duab thiab loj los ntawm ntau txoj kev tsim, thiab ces welding lub welds los ntawm txawv welding txoj kev. Cov txheej txheem ntawm tau txais cov yeeb nkab steel. Piv nrog seamless steel kav, cov kav dej welded muaj cov khoom lag luam siab, tshwj xeeb tshaj yog cov phab ntsa tuab, cov khoom siv tseem ceeb, cov hneev taw me me, kev ua haujlwm tsis tu ncua hauv kev tsim khoom, cov khoom siv tau yooj yim, thiab cov khoom siv dav hauv chav tsev.
Cov yeeb nkab welded yuav tsum tau muab faib los ntawm cov txheej txheem tsim khoom, uas tau muab faib ua:
SSAW (Spirally Submerged Arc Vuam);
LSAW (Longitudinally Submerged Arc Vuam);
Muaj peb hom ERW (Electric Resistance Vuam).
