(DOM) Drawn Over Mandrel
Technically, DOM tsis yog ib hom hlau raj, tab sis theej cov txheej txheem uas lub raj tiav lawm. Nws raug suav hais tias yog lub raj zoo, thiab feem ntau yog tsim los ntawm SAE 1020 lossis 1026 steel. Thawj theem ntawm kev tsim khoom yog zoo tib yam rau cov uas siv los ua hluav taws xob tiv thaiv welded raj, tab sis nyob rau hauv cov theem tiav tag nrho flash weld raug tshem tawm thiab lub raj yog txias los ntawm ib tug mandrel. Cov txheej txheem txias txias muab lub raj nrog qhov zoo dua qhov kam rau ua, txhim kho qhov chaw tiav thiab qhov muaj zog weld lub zog ua tiav. DOM feem ntau yog siv tsis raug raws li "seamless raj" thaum nws yeej muaj seam (txawm tias nws yuav luag tsis pom).
Seamless Mechanical Tubing
Lub raj seamless yog tsim los siv cov txheej txheem hu ua "extrusion". Thaum lub sij hawm tus txheej txheem no ib tug khoom steel bar yog pierced txawm lub chaw uas siv ib tug tuag, tig cov khoom puag ncig mus rau hauv ib puag ncig raj.
Yeej muaj ob hom seamless raj:
Cold Drawn Seamless (CDS) ib txwm ua los ntawm SAE 1018, muaj qhov ua siab ntev thiab zoo nto
Kub Finished Seamless (HFS) ib txwm ua los ntawm SAE 1026, muaj kev tiv thaiv tsawg dua thiab ua kom tiav - Tsis muaj zog li CDS
