Preheating yog cov txheej txheem tseem ceeb hauv cov tshuab vuam pob tw uas suav nrog kev nce qhov kub ntawm lub hauv paus hlau ua ntej pib ua haujlwm vuam. Kev nkag siab txog lub hom phiaj thiab cov txiaj ntsig ntawm preheating yog qhov tseem ceeb rau cov welders thiab cov kws tshaj lij hauv kev lag luam vuam. Cov kab lus no tshawb txog qhov tseem ceeb ntawm preheating hauv lub taub qab vuam tshuab, qhia txog nws lub luag haujlwm hauv kev ua kom muaj kev vam meej welds thiab txhawb nqa qhov zoo.
- Cov ntsiab lus ntawm Preheating: Preheating yuav tsum ua kom sov lub hauv paus hlau mus rau qhov kub thiab txias ua ntej vuam. Qhov ntsuas kub ua ntej yog txiav txim siab raws li cov khoom siv, thickness, sib koom tsim, thiab cov txheej txheem vuam.
- Kev Tiv Thaiv Kev Cracking: Ib qho ntawm lub hom phiaj tseem ceeb ntawm preheating yog los tiv thaiv kev tawg ntawm qhov sib koom ua ke. Preheating txo qhov kub ntawm qhov nruab nrab ntawm thaj tsam weld thiab cov hlau puag ncig, txo qhov kev pheej hmoo ntawm hydrogen-induced cracking thiab txias cracking.
- Stress Relief: Preheating kuj muab kev ntxhov siab rau lub hauv paus hlau. Nws pab txo cov kev ntxhov siab sab hauv los ntawm cov txheej txheem vuam, txo qhov kev pheej hmoo ntawm kev cuam tshuam thiab kev ntxhov siab nyob hauv qhov kawg weld.
- Txhim kho Weld Toughness: Los ntawm preheating lub hauv paus hlau, lub weld sib koom ua ke txhim kho toughness thiab ductility. Qhov no ua rau welds nrog kev cuam tshuam ntau dua thiab txhim kho tag nrho cov khoom siv kho tshuab.
- Txo Hydrogen Embrittlement: Preheating pab txo hydrogen embrittlement, uas yog ib qho tshwm sim uas hydrogen atoms diffuse rau hauv cov hlau weld, ua rau nws nkig. Qhov kub siab thaum lub sij hawm preheating pab txhawb kev khiav tawm ntawm hydrogen, txo qhov kev pheej hmoo ntawm embrittlement.
- Zoo dua Weld Penetration: Preheating pab kom ua tau zoo dua weld nkag mus, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv tuab. Qhov kub siab softens lub hauv paus hlau, ua rau nws yooj yim dua rau cov txheej txheem vuam kom nkag mus los ntawm kev sib koom ua ke.
- Xyuas kom zoo Fusion: Preheating txhawb kom fusion ntawm cov hlau weld thiab lub hauv paus hlau. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog thaum ua hauj lwm nrog high-alloy steels thiab lwm yam ntaub ntawv uas yuav ua rau tsis zoo fusion.
- Txo qhov kub ntawm qhov cuam tshuam (HAZ): Preheating pab tswj qhov loj ntawm thaj chaw kub ntxhov (HAZ) thaum vuam. Ib qho me me HAZ txo qhov kev pheej hmoo ntawm kev hloov metallurgical hauv lub hauv paus hlau, khaws cia nws cov khoom qub.
Nyob rau hauv xaus, preheating plays lub luag hauj lwm tseem ceeb nyob rau hauv lub taub qab vuam tshuab los ntawm kev npaj lub hauv paus hlau rau welding thiab xyuas kom meej welds zoo. Cov txheej txheem tiv thaiv kev tawg, muab kev ntxhov siab, txhim kho weld toughness, txo cov hydrogen embrittlement, txhim kho weld nkag mus, txhawb kev sib xyaw kom zoo, thiab txo qhov kub ntawm qhov chaw. Los ntawm kev ua tib zoo siv cov txheej txheem preheating raws li cov khoom siv tshwj xeeb thiab cov txheej txheem vuam, cov welds thiab cov kws tshaj lij tuaj yeem ua tiav cov vuam zoo nrog cov khoom siv zoo tshaj plaws. Hais txog qhov tseem ceeb ntawm preheating pab txhawb rau kev ua kom zoo ntawm pob tw vuam kev ua haujlwm, txhawb nqa kev nyab xeeb thiab txhim khu kev qha hlau koom nrog ntau hom kev siv thiab kev lag luam.
Post lub sij hawm: Lub Xya hli ntuj-26-2023
