Dab tsi yog weld tawg?Nws yog qhov teeb meem loj tshaj plaws hauv welds.Nyob rau hauv kev sib koom tes ntawm vuam kev nyuaj siab thiab lwm yam brittleness yam, lub bonding quab yuam ntawm cov hlau atoms nyob rau hauv lub zos cheeb tsam ntawm lub welded ob leeg raug puas tsuaj thiab ib tug tshiab interface yog tsim.Hauv kev siv tshuab vuam, peb yuav tsum tsis txhob vuam tawg.
Kub tawg ntawm welding tawg:
Cov tawg kub yog tsim nyob rau hauv qhov kub thiab txias, los ntawm qhov kub thiab txias mus rau qhov kub siab tshaj A3, yog li lawv hu ua kub tawg, kuj hu ua kub tawg.Yuav ua li cas tiv thaiv kub tawg?Raws li cov cim ntawm kub tawg yog cuam tshuam nrog kev ntxhov siab, txoj kev tiv thaiv yuav tsum tau pib los ntawm ob yam ntawm kev xaiv cov khoom siv thiab cov txheej txheem vuam.
Cold cracks ntawm vuam tawg:
Cov kab nrib pleb txias yog tsim thaum lub sij hawm los yog tom qab vuam, ntawm qhov kub thiab txias, nyob ib ncig ntawm lub martensite transformation kub (piv txwv li Ms point) ntawm hlau, los yog nyob rau hauv ib tug kub ntawm 300 ~ 200 ℃ (los yog T ＜ 0.5Tm, Tm yog lub melting point kub). qhia nyob rau hauv qhov kub thiab txias), yog li lawv hu ua txias tawg.
Reheat cracks ntawm vuam tawg:
Reheat cov kab nrib pleb xa mus rau cov pob qij txha welded ntawm qee cov hlau tsis tshua muaj zog thiab cov hlau tsis muaj zog uas muaj vanadium, chromium, molybdenum, boron thiab lwm yam alloys.Thaum lub sij hawm cua sov txheej txheem (xws li kev nyuaj siab annealing, multi-layer thiab multipass vuam, thiab high-temperature ua hauj lwm), cov kab nrib pleb uas tshwm sim nyob rau hauv lub coarse grain cheeb tsam ntawm tshav kub cuam tshuam cheeb tsam thiab tawg raws tus thawj austenite grain ciam teb kuj hu ua kev nyuaj siab. nyem annealing cracks (SR tawg).
Muaj ntau qhov laj thawj rau kev sib tsoo vuam, tab sis tsis muaj teeb meem vim li cas, tsuav yog txoj kev tiv thaiv tau ua tiav, kev sib tsoo ntawm cov kab nrib pleb thaum vuam tuaj yeem txo qis heev.
Post lub sij hawm: Sep-20-2022