Tsis txhob luag

Cov kab nrib pleb yog ib hom vuam tsis xws luag nyob rau hauv thread steel kav, posing ib qho cuam tshuam tseem ceeb ntawm kev nyab xeeb ntawm kev nyab xeeb. Lawv tsis tsuas yog ua kom nrawm dua cov kav hlau corrosion tab sis kuj tseem nqa txoj kev pheej hmoo ntawm cov kev sib tw tawg, yog tsim kev nyab xeeb ntau txaus ntshai. Cov xwm txheej hauv qab cov yeeb nkab steel tawg kis tshwm sim sib txawv thiab tuaj yeem faib rau hauv cov kab nrib pleb thiab tawg txias. Cov kab nrib pleb kub thaum lub sijhawm sib tw vim kev sib sau ua ke ntawm qee yam tshuaj, thaum kawg ua los ntawm Weld shrinkage. Qhov kev coj ua kev sib txawv ntawm kub tawg feem ntau ua rau kev tsim ntawm transverse cracks. Ntawm qhov tod tes, cov kab nrib pleb txias yog kev hloov pauv uas tshwm sim thaum lub weld txias mus rau martensitic kub tom qab vuam. Cov kab nrib pleb txias yog feem ntau cuam tshuam los ntawm kev ntxhov siab, cov qauv hardened, thiab qhov sib txawv hydrogen, uas tuaj yeem ua rau tsim ntawm ob transverse thiab longitudinal cracks.