1. Cov khau tiv thaiv vuam yuav tsum hnav rau kev ua haujlwm vuam. Nws cov qauv siv tus qauv yog ld4-1991 "welding tiv thaiv khau".Vuam khau tiv thaiv muaj kev tiv thaiv kub, hluav taws xob rwb thaiv tsev, tiv thaiv ntiv taw thiab lwm yam haujlwm.Qhov hnyav ntawm cov khau tiv thaiv smashing yog muab tso rau ntawm kev tiv thaiv.
2. Lub sab sauv yog tiv thaiv vuam spatter los ntawm sab sauv rau hauv khau.