Crack Defect

Kev sib tsoo yog ib qho kev sib tsoo ntawm cov kav hlau threaded, uas muaj kev cuam tshuam loj rau kev nyab xeeb ntawm cov kav dej. Nws tsis tsuas yog ua kom nrawm nrawm ntawm cov kav hlau steel tab sis tseem ua rau muaj kev pheej hmoo ntawm kev tawg tawg, yog li tsim kev nyab xeeb ntau heev. Cov xwm txheej uas ua rau tawg hauv cov kav hlau sib txawv thiab tuaj yeem muab faib ua cov tawg kub thiab txias tawg. Kub tawg tshwm sim thaum lub sij hawm vuam txheej txheem thaum tej yam khoom sib sau thiab nws thiaj li ua rau cov kab nrib pleb vim weld contraction. Kev nthuav qhia ntawm cov kab nrib pleb kub feem ntau ua rau cov kab nrib pleb. Cov kab nrib pleb txias, ntawm qhov tod tes, txhim kho thaum lub vuam txias rau martensitic kub. Cov kab nrib pleb txias feem ntau cuam tshuam los ntawm cov yam ntxwv xws li kev ntxhov siab, microstructure hardened, thiab diffusible hydrogen, uas tuaj yeem ua rau kev tsim ntawm ob qho tib si transverse thiab longitudinal tawg.