Seamless raj 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 rau 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 tuam txhab ntawm cov kav dej seamless dua li cov kav dej welded (piv rau cov kav dej seamless, qhov nkag barrier rau welded kav 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%.