Lub peev xwm tawm lub zog ntawm txhuas ntawv yog qis dua li ntawm ntawv steel.
Yog li no, nyob hauv tib qho xwm txheej (tuab, thaj chaw txiav txim siab, thiab lwm yam), txhuas phaj deforms ntau hauv dav.
Ntxiv mus, thaum tapping load ntawm txhuas phaj yog me dua loj dua, nws yog qhov yooj yim npleem cov hniav.
Cov phiaj hlau yog ntau ruaj ntseg.
Tau kawg, nws yuav tsum txiav txim siab raws li koj cov duab, cov qauv thiab thau khoom.