Welded steel kav, tseem hu ua welded kav, yog cov kav hlau uas tsim los ntawm vuam steel daim hlau los yog strips tom qab lawv tau curled thiab tsim. Cov txheej txheem ntau lawm ntawm welded steel kav yog qhov yooj yim, nrog kev ua haujlwm siab, ntau yam kev qhia tshwj xeeb, thiab cov khoom siv qis. Txawm li cas los xij, lawv lub zog feem ntau qis dua li cov kav dej seamless. Txij li thaum xyoo 1930s, nrog rau kev txhim kho sai ntawm cov khoom siv zoo steel nruam dov ntau lawm thiab kev nce qib hauv vuam thiab tshuaj xyuas thev naus laus zis, qhov zoo ntawm vuam seams tau zoo dua qub, ua rau muaj ntau yam ntawm welded steel yeeb nkab specifications, uas tau hloov seamless steel. cov kav dej hauv ntau qhov chaw. Welded steel kav yog muab faib ua longitudinal welded kav thiab kauv welded kav raws li daim ntawv ntawm lawv welding seams.
Longitudinal Welded Steel Pipes for Low-Pressure Liquid Transportation (GB/T 3092-2008}), tseem hu ua cov kav dej zoo tib yam lossis cov kav dej dub, yog siv rau kev xa dej, roj, cua, roj, cua sov, thiab lwm yam qis. cov kua dej siab, nrog rau rau lwm lub hom phiaj. Cov kav dej no tau muab faib ua cov kav dej tsis tu ncua thiab tuab raws li phab ntsa tuab, thiab mus rau hauv cov kav dej dawb-kawg thiab threaded-kawg raws li daim ntawv ntawm lawv qhov kawg. Cov kev qhia tshwj xeeb ntawm cov kav dej no tau qhia nyob rau hauv nominal diameters (mm), uas yog kwv yees qhov tseem ceeb ntawm lub puab diameters. Raws li kev cai, lawv kuj tau hais tawm hauv nti, xws li 1½ nti. Ntxiv nrog rau kev siv ncaj qha hauv kev thauj mus los, cov kav dej no tau siv dav los ua cov khoom siv raw rau cov kav dej galvanized welded steel kav rau kev thauj mus los ntawm cov kua dej tsawg.
Galvanized Welded Steel Pipes rau Low-Pressure Liquid Transportation (GB/T 3091-2015}), tseem hu ua galvanized electric welded kav lossis cov kav dej dawb, yog cov kav dej kub-dip galvanized welded steel kav (lub qhov cub-welded lossis hluav taws xob-welded) siv. siv rau kev xa dej, roj, cua, roj, cua sov chav, dej kub, thiab lwm yam dej uas tsis tshua muaj siab lossis rau lwm yam. Lawv tau muab faib ua cov kav dej tsis tu ncua thiab thickened galvanized raws li phab ntsa thickness, thiab mus rau hauv lub tiaj-kawg thiab threaded-kawg galvanized kav raws li daim ntawv ntawm lawv qhov kawg. Cov lus qhia tshwj xeeb tau qhia nyob rau hauv nominal diameters (mm), uas yog kwv yees qhov tseem ceeb ntawm lub puab diameters, thiab kuj feem ntau hais nyob rau hauv nti, xws li 1½ nti.
Ordinary Carbon Steel Electrical Conduit (GB 3640-88) yog siv nyob rau hauv hluav taws xob installation tej yaam num rau industrial thiab civil vaj tse, machinery installation, thiab lwm yam kev siv los tiv thaiv hluav taws xob nyob ntawm tej.
Longitudinal Electric Welded Steel Pipes (GB/T 13793-2016) yog cov yeeb nkab steel nrog cov welds sib npaug mus rau qhov ntev ntawm cov yeeb nkab. Lawv feem ntau muab faib ua metric fais welded steel kav, hluav taws xob welded nyias-walled kav, transformer txias roj kav, thiab lwm yam.
Spiral Submerged Arc Welded Steel Pipes for Pressure Pipelines (SY 5036-83) yog tsim los ntawm kub dov steel coils, spirally tsim ntawm ambient kub, thiab welded siv ob-sided submerged arc vuam txoj kev. Cov kav dej no yog siv los thauj cov kua dej uas muaj zog. Lawv muaj peev xwm ua kom muaj zog-kev coj tus kheej, kev ua haujlwm vuam zoo heev, thiab tau ua tiav kev tshuaj xyuas thiab kev sim, ua kom muaj kev nyab xeeb thiab siv tau. Nrog rau txoj kab uas hla loj thiab kev thauj mus los tau zoo, lawv tuaj yeem txuag kev nqis peev hauv cov kav xa dej thiab feem ntau yog siv rau cov roj thiab cov kav dej ntuj.
High-Frequency Welded Spiral Steel Pipes for Pressure Pipelines (SY 5038-83}) yog tsim los ntawm kub dov steel coils, spirally tsim ntawm ambient kub, thiab welded siv lub high-frequency lap welding txoj kev. Cov kav dej no yog siv rau kev thauj cov kua dej uas muaj zog thiab muaj peev xwm ua tau zoo, zoo plasticity, thiab yooj yim ntawm vuam thiab ua. Lawv tau dhau los ua kev soj ntsuam thiab kev sim tshuaj nruj, ua kom muaj kev nyab xeeb thiab siv tau. Nrog rau txoj kab uas hla loj thiab kev thauj mus los tau zoo, lawv tuaj yeem txuag kev nqis peev hauv cov kav xa dej thiab feem ntau yog siv rau cov roj thiab cov kav dej ntuj.
General Spiral Submerged Arc Welded Steel Pipes for Low-Pressure Fluid Transportation (SY5037-83) yog tsim los ntawm kub dov steel coils, spirally tsim ntawm ambient kub, thiab welded siv ob sab los yog ib sab tsis siv neeg submerged arc txoj kev vuam. Cov kav dej no yog siv rau kev thauj dej, roj, cua, thiab chav nyob rau hauv cov xwm txheej tsis tshua muaj siab.
General High-Frequency Welded Spiral Steel Pipes for Low-Pressure Fluid Transportation (SY 5039-83) yog tsim los ntawm kub dov steel coils, spirally tsim ntawm ambient kub, thiab welded siv high-frequency lap welding txoj kev. Cov kav dej no yog siv rau kev thauj mus los ntawm cov dej uas tsis tshua muaj siab.
