Bonding yeeb nkab cov pob qij txha, qhov twg ob los yog ntau qhov chaw siv ib qho kev sib txuas ntawm cov welded pob qij txha, los yog hais txog ob los yog ntau qhov chaw txuas los ntawm vuam cov pob qij txha, suav nrog welds, fusion zone thiab tshav kub cuam tshuam.

Welded pob qij txha cheeb tsam

Tom qab haum cov hlau thiab muab tub lim hlau melts ceev ceev Youyi tsim tom qab txias thiab solidification.Weld los ntawm cov qauv cam khwb cia ntawm cov kua hlau siv lead ua, coarse nplej, kev sib cais, lub koom haum tsis ntom.Txawm li cas los xij, vim yog lub pas dej me me, cua txias ceev, kev tswj xyuas nruj ntawm cov tshuaj muaj pes tsawg leeg, carbon, sulfur, phosphorus tsawg, tab sis kuj los ntawm kev kho cov tshuaj muaj pes tsawg leeg ntawm weld alloying, nws muaj qee yam ntawm cov ntsiab lus alloying, yog li ntawd, kev ua tau zoo ntawm cov hlau vuam tsis yog qhov teeb meem loj, ua tau raws li qhov yuav tsum tau ua, tshwj xeeb tshaj yog lub zog yooj yim ncav cuag.

fusion cheeb tsam

Melting zone thiab ib qho kev hloov pauv ntawm thaj chaw uas tsis yog melting.Tshuaj muaj pes tsawg leeg ntawm fusion cheeb tsam unevenly tuab cov ntaub so ntswg yog feem ntau coarse tuab hardened cov ntaub so ntswg los yog overheating ntaub so ntswg.Kev ua haujlwm ntawm cov pob qij txha welded feem ntau yog qhov phem tshaj.Fusion zone thiab tshav kub cuam tshuam cheeb tsam ntawm overheated zone (los yog quench zone) yog qhov phem tshaj ntawm cov khoom ntawm welded pob qij txha ntawm qhov tsis muaj zog, yuav cuam tshuam rau qhov zoo ntawm welded pob qij txha.

Thaum tshav kub kub cuam tshuam cheeb tsam

Heated high-temperature weld zone microstructure thiab cov khoom tshwm sim los ntawm kev hloov hauv cheeb tsam.Tsawg-carbon steel tshav kub-cuam tshuam cheeb tsam tuaj yeem muab faib ua cov cheeb tsam overheated, thiab ib feem ntawm cov theem hloov mus rau thaj tsam normalizing cheeb tsam.

(1) qhov siab tshaj plaws kub kub superheat cheeb tsam saum toj no 1100℃, coarse nplej, thiab txawm overheating cov ntaub so ntswg, hu ua lub superheat cheeb tsam.Ductility thiab toughness poob ho overheated cheeb tsam, lub tshav kub cuam tshuam cheeb tsam yog qhov phem tshaj ntawm cov neeg kho tshuab zog.

(2) Qhov siab tshaj plaws cua sov ntawm thaj tsam normalizing cheeb tsam Ac3 txog 1100℃, cov cua txias welding nplej tau me me tom qab normalizing lub koom haum hu ua normalizing cheeb tsam.Zoo dua txhua yam khoom ntawm thaj chaw normalizing.

(3) ib feem ntawm lub siab tshaj plaws kub kub theem hloov mus rau cheeb tsam los ntawm Ac1 Ac3, tsuas yog ib feem ntawm lub koom haum theem kev hloov, hu ua ib feem theem hloov chaw.Thaj chaw no nplej tsis sib xws kuj tsis zoo.Thaum lub sij hawm installation welding, vuam vuam txoj kev ntau zaus.Qhov kub kub kub welded sib koom ua ke yog hauv zos rhuab matrix hlau thiab muab tub lim lub cev ntawm molten hlau thaum solidifying daim ntawv molten.Nyob ntawm qhov microstructure thiab cov khoom ntawm ntau qhov chaw ntawm welded pob qij txha tuaj yeem muab faib ua peb ntu.