Internal Defects thiab Tsis yog -Kev Tswj Xyuas Kev Ua Haujlwm ntawm Rail Welded Joints
Dab tsi yog qhov feem ntau cuam tshuam sab hauv hauv rail welded pob qij txha?
Cov no feem ntau suav nrog: kev nkag mus tsis tiav, slag inclusions, porosity, tawg, grey me ntsis, ntxhib microstructure, overheating, thiab segregation. Cov kev tsis xws luag no txo qhov sib koom ua ke lub zog, toughness, thiab qaug zog lub neej, thiab yog nquag propagation sai nyob rau hauv rov qab tsheb ciav hlau loads, ua rau sai li sai tau puas.
Vim li cas thiaj yuav tsum flash welded pob qij txha tau puv -section ultrasonic kuaj?
Flash welds muaj qhov loj ntawm qhov vuam, lub sij hawm luv luv, thiab qhov kub thiab txias, ua rau lawv muaj kev cuam tshuam rau cov teeb meem tsis xws luag (cov pob grey, tsis tiav qhov nkag) ntawm qhov chaw vuam thiab ze ntawm txoj kab fusion. Kev tshuaj xyuas ib txwm yog qhov nyuaj rau kev txheeb xyuas cov teeb meem no; tsuas yog tag nrho -section ultrasonic scanning tuaj yeem npog tag nrho cov ntoo khaub lig-section, kom ntseeg tau tias tsis muaj qhov tsis xws luag. Qhov no yog qhov yuav tsum tau ua rau siab - kev tsheb ciav hlau ceev thiab hnyav - cov kab tsheb.
Dab tsi yog qhov tsis xws luag thiab cov ntsiab lus tseem ceeb ntawm kev tshuaj xyuas rau aluminothermic welded pob qij txha?
Aluminothermic welding muaj cov qauv nrum, thiab qhov tsis xws luag feem ntau yog ntim: porosity, slag inclusions, shrinkage kab noj hniav, thiab tawg. Cov chaw soj ntsuam tseem ceeb yog lub taub hau tsheb ciav hlau thiab cov tsheb ciav hlau hauv cheeb tsam daim duab peb sab, vim tias cov cheeb tsam no muaj kev ntxhov siab ntau tshaj plaws thiab tseem muaj siab - thaj chaw muaj kev pheej hmoo rau qhov tsis xws luag. Ib txhij, yuav tsum tau them nyiaj rau crystallization tawg, uas yog me me tab sis tsis tshua muaj siab.
Dab tsi yog cov txheej txheem thiab kev tuav tswj cov kev cai sib txawv?
Ob lub teb chaws thiab kev tsheb ciav hlau cov qauv qhia meej meej tias cov kab nrib pleb, kev nkag tsis tiav, thiab kub dhau yog qhov ua rau tuag taus uas yuav tsum tau muab pov tseg thiab rov ua dua -welded. Porosity, slag inclusions, thiab grey me ntsis yog graded raws li qhov loj me, kom muaj nuj nqis, thiab qhov chaw; tshaj qhov txwv yuav ua rau tsis tsim nyog. Cov txheej txheem nruj me ntsis siv rau kev thauj khoom tseem ceeb-cov kabmob xws li lub taub hau tsheb ciav hlau thiab lub hauv paus kev tsheb nqaj hlau, tsis pub muaj qhov tsis xws luag dhau ntawm cov qauv.
Yuav ua li cas txhim kho thawj - kis tawm ntawm cov pob qij txha welded?
Kev tswj nruj nruj kawg-kev kho lub ntsej muag, cov txheej txheem vuam tsis zoo, cov nyiaj tsis txaus siab, thiab kev kho cua sov nkhaus; ua kev tshem tawm xeb, tshem tawm dej, thiab tshem tawm roj ua ntej vuam kom huv si kawg; siv cov cuab yeej siv vuam tshuab kom txo tau qhov kev hloov pauv ntawm kev tuav haujlwm; siv "tshuaj xyuas tam sim tom qab vuam, rov ua haujlwm tam sim yog tias tsis tsim nyog," thiab tiv thaiv cov pob qij txha tsis raug muab tso rau hauv kev tsim khoom.