Lub raj seamless yog ua los ntawm cov hlau tsis muaj zog tsis muaj welds. Welds tuaj yeem sawv cev rau thaj chaw tsis muaj zog (yuav raug corrosion, corrosion thiab kev puas tsuaj dav dav).

Piv nrog cov welded raj, seamless raj muaj ib tug ntau kwv yees thiab ntau meej zoo nyob rau hauv cov nqe lus ntawm roundness thiab ovality.

Lub ntsiab tsis zoo ntawm cov kav dej seamless yog tias tus nqi ib tuj siab dua ERW cov kav dej ntawm tib qhov loj thiab qib.

Lub sij hawm txhuas yuav ntev dua vim tias muaj tsawg dua cov chaw tsim khoom ntawm cov kav dej seamless dua li cov kav dej welded (piv rau cov kav dej tsis sib haum, qhov kev nkag mus rau cov kav dej welded yog qis dua).

Phab ntsa thickness ntawm seamless raj yuav tsis sib haum rau nws tag nrho ntev, qhov tseeb tag nrho cov kam rau ua yog +/- 12.5%.