Muaj peb txoj hauv kev los txheeb xyuas cov kav dej welded thiab seamless kav (smls):

1. Metallographic method

Metallographic txoj kev yog ib txoj hauv kev tseem ceeb kom paub qhov txawv ntawm cov kav dej thiab cov kav dej seamless. High-frequency resistance welded yeeb nkab (ERW) tsis ntxiv vuam cov ntaub ntawv, yog li cov vuam seam nyob rau hauv welded steel yeeb nkab yog nqaim heev, thiab weld seam tsis tuaj yeem pom meej yog tias siv txoj kev sib tsoo thiab corrosion. Thaum lub high-frequency resistance welded steel yeeb nkab yog welded yam tsis muaj kev kho cua sov, cov qauv ntawm weld seam yuav tseem ceeb sib txawv ntawm niam txiv cov khoom ntawm cov yeeb nkab steel. Nyob rau lub sijhawm no, txoj kev metallographic tuaj yeem siv los paub qhov txawv ntawm cov welded steel yeeb nkab los ntawm seamless steel yeeb nkab. Nyob rau hauv tus txheej txheem ntawm kev txheeb xyuas ob lub kav hlau, nws yog ib qho tsim nyog yuav tsum tau txiav ib qho qauv me me nrog qhov ntev thiab dav ntawm 40 mm ntawm qhov vuam taw tes, ua kev sib tsoo ntxhib, zoo sib tsoo thiab polishing ntawm nws, thiab tom qab ntawd saib cov qauv hauv metallographic. microscope. Welded steel kav thiab seamless steel kav yuav raug qhov txawv thaum ferrite thiab widmansite, puag hlau thiab weld cheeb tsam microstructures raug soj ntsuam.

2. Txoj kev Corrosion

Nyob rau hauv tus txheej txheem ntawm kev siv cov txheej txheem corrosion los txheeb xyuas cov welded kav thiab seamless kav, welded seam ntawm cov txheej txheem welded steel yeeb nkab yuav tsum tau polished. Tom qab kev sib tsoo tiav lawm, cov kab sib tsoo yuav tsum pom, thiab tom qab ntawd lub ntsej muag kawg ntawm cov welded seam yuav tsum tau polished nrog cov ntawv xuab zeb. Thiab siv 5% nitric acid cawv daws los kho lub ntsej muag kawg. Yog tias muaj qhov pom tseeb welded, nws tuaj yeem ua pov thawj tias cov yeeb nkab steel yog welded steel yeeb nkab. Txawm li cas los xij, lub ntsej muag kawg ntawm seamless steel yeeb nkab tsis muaj qhov txawv txav tom qab raug corroded.

Cov khoom ntawm welded yeeb nkab
Welded steel yeeb nkab muaj cov yam ntxwv hauv qab no vim muaj kev vuam ntau zaus, txias dov thiab lwm yam txheej txheem.
Ua ntej, kev txuag cua sov ua haujlwm zoo. Lub tshav kub poob ntawm welded steel kav yog me me, tsuas yog 25%, uas tsis yog tsuas yog ua rau kev thauj mus los, tab sis kuj txo cov nqi.
Thib ob, nws muaj dej tsis kam thiab corrosion kuj. Nyob rau hauv tus txheej txheem ntawm kev tsim kho engineering, nws tsis yog yuav tsum tau teeb tsa cov yeeb nkab trench cais.
Nws tuaj yeem raug faus ncaj qha rau hauv av lossis hauv qab dej, yog li txo qis kev tsim kho ntawm qhov project.
Thib peb, nws muaj kev cuam tshuam tsis kam. Txawm tias nyob rau hauv qhov kub thiab txias ib puag ncig, cov yeeb nkab steel yuav tsis puas, yog li nws cov kev ua tau zoo muaj qee yam zoo.

Cov khoom ntawm seamless yeeb nkab
Vim lub zog tensile siab ntawm cov khoom siv hlau ntawm seamless steel yeeb nkab, nws lub peev xwm los tiv thaiv kev puas tsuaj muaj zog dua, thiab nws muaj qhov hollow channel, yog li nws tuaj yeem thauj cov kua dej zoo. Cov yeeb nkab steel, thiab nws cov rigidity yog qhov loj. Yog li ntawd, qhov ntau load seamless steel yeeb nkab tuaj yeem nqa tau, nws tuaj yeem siv dav hauv cov haujlwm nrog kev tsim kho ntau dua.

3. Paub qhov txawv raws li tus txheej txheem

Nyob rau hauv tus txheej txheem ntawm kev txheeb xyuas welded kav thiab seamless kav raws li tus txheej txheem, welded steel kav yog welded raws li txias dov, extrusion thiab lwm yam txheej txheem. Thaum lub steel yeeb nkab yog welded, nws yuav tsim ib tug kauv welded yeeb nkab thiab ib tug ncaj seam welded yeeb nkab, thiab yuav tsim ib puag ncig steel yeeb nkab, ib tug square steel yeeb nkab, ib tug oval steel yeeb nkab, ib tug triangular steel yeeb nkab, hexagonal steel yeeb nkab, a rhombus steel yeeb nkab, ib tug octagonal steel yeeb nkab, thiab txawm ib tug complex steel yeeb nkab.

Nyob rau hauv luv luv, cov txheej txheem sib txawv yuav tsim cov kav hlau ntawm cov duab sib txawv, kom cov kav hlau welded thiab seamless steel kav tuaj yeem ua kom pom tseeb. Txawm li cas los xij, nyob rau hauv tus txheej txheem ntawm kev txheeb xyuas seamless steel kav raws li tus txheej txheem, nws yog tsuas yog raws li cov kub dov thiab txias dov txoj kev kho mob. Feem ntau muaj ob hom seamless steel kav, uas tau muab faib ua kub dov seamless steel kav thiab txias-dov seamless steel kav. Kub dov seamless steel kav yog tsim los ntawm kev tho, dov thiab lwm yam txheej txheem, tshwj xeeb tshaj yog loj-inch thiab tuab seamless steel kav yog welded los ntawm cov txheej txheem no; Cov kav dej txias txias yog tsim los ntawm cov kab kos txias txias, thiab lub zog ntawm cov khoom siv qis dua, tab sis nws cov txheej txheem sab nrauv thiab sab hauv yog du.

4. Muab faib los ntawm kev siv

Welded steel kav muaj ntau dua dabtsi yog khoov thiab torsional zog thiab muaj peev xwm load-bearing ntau, yog li lawv yog feem ntau lug siv nyob rau hauv lub tsim ntawm mechanical qhov chaw. Piv txwv li, roj laum kav, tsheb tsav shafts, tsheb kauj vab ncej, thiab steel scaffolding siv nyob rau hauv lub tsev tsim yog tag nrho cov ua los ntawm welded steel kav. Txawm li cas los xij, seamless steel kav yuav siv tau los ua cov kav dej rau kev xa cov kua dej vim tias lawv muaj cov seem hollow thiab ntev strips ntawm cov hlau tsis muaj seams nyob ib ncig ntawm lawv. Piv txwv li, nws tuaj yeem siv los ua lub raj xa dej rau kev thauj cov roj, roj av, roj, dej, thiab lwm yam. Tsis tas li ntawd, lub zog dabtsi yog khoov ntawm seamless steel yeeb nkab yog qhov me me, yog li nws feem ntau yog siv rau hauv cov kav dej superheated rau qhov qis thiab nruab nrab siab boilers, boiling dej kav thiab superheated chav kav rau locomotive boilers. Nyob rau hauv luv luv, los ntawm kev faib tawm ntawm kev siv, peb muaj peev xwm kom meej meej qhov txawv welded steel kav thiab seamless steel kav.