Kev phom sij ntawm vuam kev nyuaj siab nyob rau hauv nruab nrab zaus qhov chaw vuam tshuab

Vuam kev nyuaj siab yog ib qho kev txhawj xeeb tseem ceeb hauv thaj tsam ntawm nruab nrab zaus qhov chaw vuam tshuab. Tsab ntawv xov xwm no tshawb txog cov teeb meem cuam tshuam nrog kev ntxhov siab welding thiab nws cuam tshuam rau cov khoom siv welded. Tsis tas li ntawd, nws muab kev nkag siab txog kev ntsuas uas tuaj yeem coj los txo cov kev pheej hmoo no.

1. Distortion thiab Deformation:Vuam tsim cov cua kub hnyav, uas ua rau thaj chaw nthuav dav thiab kev cog lus ntawm cov ntaub ntawv. Qhov no thermal cycling yuav ua rau distortion thiab deformation ntawm welded Cheebtsam. Cov distortions no tuaj yeem cuam tshuam rau tag nrho cov duab, qhov tseeb qhov tseeb, thiab kev ncaj ncees ntawm cov khoom siv welded.
2. Residual Stresses:Vuam tsim cov residual stresses nyob rau hauv cov khoom siv welded vim cov cua sov tsis sib xws thiab cua txias. Cov kev ntxhov siab no tuaj yeem ua rau muaj kev hloov pauv microstructural, txo cov khoom siv zog thiab txhawb kev pib tawg thiab nthuav tawm.
3. Cracking thiab Fracture:Kev sib sau ntawm cov kev ntxhov siab uas seem tuaj yeem ua rau thaj chaw welded raug cuam tshuam. Kev ntxhov siab ntawm qhov sib txuas ntawm qhov sib txuas tuaj yeem ua rau microcracks lossis txawm tias macroscopic fractures, cuam tshuam cov khoom siv ntawm kev sib koom ua ke.
4. Txo Fatigue Lub Neej:Residual stresses generated thaum lub sij hawm welding yuav txo tau lub neej qaug zog ntawm welded Cheebtsam. Cyclic loading tuaj yeem ua kom qhov kev loj hlob ntawm cov kab nrib pleb ntawm cov ntsiab lus kev ntxhov siab, ua rau ua tsis tiav ntxov.
5. Kev coj cwj pwm:Qee cov ntaub ntawv, tshwj xeeb tshaj yog cov uas muaj cov ntsiab lus ntawm cov pa roj carbon monoxide siab, muaj kev cuam tshuam los ua nkig thaum raug vuam-vim kev ntxhov siab. Qhov brittleness no tuaj yeem ua rau cov pob txha tsis tau xav txog thaum thauj khoom.

Mitigation Measures for Weld Stress:

1. Pre-welding Planning:Kev tsim thiab kev npaj kom zoo tuaj yeem txo cov ntsiab lus ntawm kev ntxhov siab thiab ua kom muaj kev sib txawv ntawm cov cua sov, txo qhov muaj peev xwm rau vuam kev ntxhov siab.
2. Tswj Cooling:Ua raws li cov txheej txheem txias txias, xws li kev kho cua sov tom qab vuam, tuaj yeem pab txo qis kev ntxhov siab thiab txhim kho cov khoom siv.
3. Joint Design Optimization:Kev siv cov kev sib koom ua ke tsim nyog uas faib cov kev ntxhov siab sib npaug tuaj yeem txo qhov kev ntxhov siab ntawm cov ntsiab lus tshwj xeeb.
4. Kev xaiv khoom siv:Xaiv cov ntaub ntawv nrog cov thermal expansion coefficients zoo sib xws tuaj yeem pab txo qis kev cuam tshuam thiab kev ntxhov siab thaum vuam.
5. Kev ntxhov siab ntxhov siab Annealing:Kev siv cov txheej txheem kev ntxhov siab annealing tom qab vuam tuaj yeem pab txo qis kev ntxhov siab thiab kho cov khoom siv.
6. Cov txheej txheem vuam:Kev siv cov txheej txheem vuam kom zoo, xws li preheating thiab tswj cov vuam tsis sib xws, tuaj yeem pab txo qis cov cim ntawm kev ntxhov siab ntau dhau.

Vuam kev nyuaj siab ua rau muaj teeb meem loj hauv nruab nrab zaus qhov chaw vuam tshuab, suav nrog kev cuam tshuam, kev ntxhov siab seem, tawg, txo qaug zog lub neej, thiab kev coj cwj pwm nkig. Kev nkag siab txog cov kev pheej hmoo no thiab siv cov kev ntsuas tsim nyog los txo cov kev ntxhov siab vuam yog qhov tseem ceeb los xyuas kom meej lub neej ntev, kev cia siab, thiab kev ua haujlwm ntawm cov khoom siv welded. Los ntawm kev ua tib zoo npaj, xaiv cov khoom siv, thiab siv cov tswv yim daws kev ntxhov siab, qhov cuam tshuam tsis zoo ntawm vuam kev ntxhov siab tuaj yeem txo qis, ua rau cov pob qij txha zoo thiab ruaj khov.