Cov txheej txheem kev cai rau cov laj kab laj kab hlau feem ntau suav nrog cov khoom siv zoo, lub zog muaj zog, qhov tseeb qhov tseeb, kev kho saum npoo, thiab kev ua haujlwm zoo. Cov ntaub ntawv hlau tsim nyog yuav tsum raug xaiv raws li qhov chaw ua haujlwm thiab cov kev xav tau ua haujlwm kom ntseeg tau tias lub rooj vag muaj peev xwm txaus -cov kabmob muaj peev xwm thiab ruaj khov. Cov khoom siv yuav tsum ua tau raws li cov qauv zoo thiab tsis muaj qhov tsis xws luag - xws li cov kab nrib pleb loj, deformation, lossis corrosion- uas tuaj yeem ua rau tsis zoo.
Hlau laj kab rooj vag yuav tsum ua kom muaj zog tag nrho thiab kev sib txuas ruaj khov. Welds lossis cov ntsiab lus sib txuas ntawm lub rooj vag ncej thiab lub rooj vag nplooj yuav tsum muaj kev ruaj ntseg thiab txhim khu kev qha los tiv thaiv cov teeb meem xws li tawg los yog xoob thaum lub sij hawm ntev - siv. Tsis tas li ntawd, qhov ntev yuav tsum ua raws li cov qauv tsim tshwj xeeb, ua kom muaj qhov tseeb, qhov tiaj tus, thiab kev ua haujlwm du (qhib thiab kaw) tom qab kev teeb tsa.
Kev kho saum npoo yog lwm qhov tseem ceeb ntawm kev tswj kom zoo. Cov txheej txheem tiv thaiv-xws li kub-dip galvanizing, hmoov txheej, lossis pleev xim- yuav tsum tau siv raws li ib puag ncig tshwj xeeb los txhim kho cov khoom tiv thaiv xeb, xeb, thiab kev laus. Kev ua tiav yuav tsum tsis sib xws thiab tsis zoo, tsis muaj tev, flaking, lossis tsis pom qhov chaw, kom ntseeg tau tias muaj kev ruaj ntseg hauv qhov chaw sab nraum zoov.
Hlau laj kab rooj vag yuav tsum tau ua raws li cov kev cai rau kev nyab xeeb thiab yooj yim ntawm kev siv. Accessories xws li xauv, hinges, thiab latches yuav tsum tau ruaj ntseg ntsia, kom ntseeg tau tias du thiab txhim khu kev qha. Kev soj ntsuam nruj ntawm cov ntaub ntawv, kev tsim khoom, thiab cov khoom tiav yog qhov tseem ceeb kom ntseeg tau tias lub rooj vag yog qhov ruaj khov, muaj kev nyab xeeb siv, thiab ruaj khov.
