28.9. Kev tsis xws luag?

Cov kab nrib pleb yog ib hom vuam tsis xws luag nyob rau hauv rebar steel kav, cuam tshuam rau kev nyab xeeb ntawm pipelines. Lawv tsis tsuas yog ua kom nrawm dua tus nqi xeb ntawm cov kav hlau steel tab sis kuj ua rau muaj kev pheej hmoo ntawm kev sib tw tawg, ua rau muaj kev nyab xeeb rau kev nyab xeeb kom muaj kev nyab xeeb loj. Cov xwm txheej hauv qab cov yeeb nkab steel tawg cov kab sib txawv thiab tuaj yeem faib ua cov kab nrib pleb thiab tawg txias. Cov kab nrib kub tshwm sim thaum lub sij hawm vuam thaum qee cov tshuaj yeeb nthuav dav, thaum kawg ua rau tawg vim tias cov shrinkage ntawm weld. Qhov kev tawm tsam ntawm cov kab nrib pleb kub feem ntau tshwm sim hauv kev sib tsoo. Cov kab nrib pleb txias tshwm sim thaum qhov kub poob mus ntaus kub tom qab vuam. Cov kab nrib pleb txias yog feem ntau cuam tshuam los ntawm kev ntxhov siab thiab cov khoom siv xws li cov qauv hardened thiab diffused hydrogen, muaj peev xwm ua rau ob qho kev hloov pauv thiab ntev tawg.