Yuav ua li cas txheeb xyuas cov pawm cuav thiab shoddy nres?
1. Ntim
Txawm hais tias cov tsos ntawm cov ntaub thaiv npog cuav zoo ib yam li cov khoom tiag, nws yog qhov nyuaj los npog txhua yam ntawm cov ntsiab lus. Cov ntawv luam tawm ntawm lub thawv ntim khoom ntawm cov ntaub ntawv cuav yuav tsis meej, tsis meej, thiab yooj yim. Tsis muaj cov ntaub ntawv khoom lag luam xws li cov chaw tsim khoom lub npe thiab chaw nyob ntawm lub thawv ntim khoom, thiab tsis muaj daim ntawv pov thawj ntawm kev sib haum xeeb hauv lub thawv.
2. Qhov tshwm sim ntawm cov pawm nres
Cov khoom siv zoo ntawm cov khoom siv zoo yog cov xim zoo nkauj, cov txheej txheem kev sib txhuam yog huv thiab du, thiab cov grooves tsis tu ncua thiab cov xim yuav tsis tev tawm. Cov khoom siv ntawm kev sib txhuam ntawm qhov chaw nres tsheb tsis zoo yog qhov tsis sib xws, kev ua haujlwm tsis zoo, cov grooves tau qhib heev, thiab cov xim ntawm cov brakes yuav muaj xim liab thiab oxidation.
3. Saib kev koom tes
Kev tsim cov pawm nres tsis tu ncua yog tswj hwm nruj, thiab cov pob qij txha ntawm txhua qhov yog lav kom ruaj khov; Yog tias cov ntaub thaiv tshiab tau pom tias muaj cov rivets xoob, degumming, thiab lwm yam, nws yuav yog cov khoom cuav thiab tsis zoo.
4. Saib cov khoom siv tes ua
Cov pawm tsis tu ncua txais cov cuab yeej ua haujlwm siab heev thiab cov cuab yeej tsim khoom, uas yog qhov tseeb thiab ceev faj; Cov khoom lag luam qis dua qee zaum muaj qhov zoo nkauj, tab sis vim yog cov cuab yeej tsim khoom tsis zoo, lawv tuaj yeem ua rau tawg, xuab zeb qhov, slag inclusions, burrs lossis bruises.
