Txij li Q690D muaj kev ua haujlwm vuam zoo, nws tuaj yeem txuas nrog ntau yam txheej txheem vuam. Cov nram qab no feem ntau siv Q690D vuam txheej txheem:
1. Kev tuav hluav taws xob arc vuam: Siv cov khoom siv hluav taws xob qis qis rau vuam, xws li J507 lossis J607 electrodes. Vuam yuav tsum tau preheating kev kho mob ua ntej welding, preheating kub ntawm 150 degree ~ 250 degree, welding txheej txheem los tswj lub interlayer kub tsis qis tshaj qhov preheating kub. Tom qab vuam yuav tsum tau dehydrogenation kev kho mob, uas yog, ntawm 200 degree kom tswj tau ntau tshaj 2 teev.
2. submerged arc vuam: siv cov hydrogen submerged arc vuam hlau tsis tshua muaj rau vuam, xws li H13Mn2TiA lossis H13Mn2MoA hlau. Vuam yuav tsum tau preheating kev kho mob ua ntej welding, preheating kub ntawm 150 degree ~ 250 degree, welding txheej txheem los tswj lub interlayer kub tsis qis tshaj qhov preheating kub. Tom qab vuam yuav tsum dehydrogenated, uas yog, ntawm 200 degree rau ntau tshaj 2 teev.
3. Gas-shielded welding: Siv CO2 gas-shielded vuam los yog sib xyaw roj-shielded vuam (Ar+CO2), thiab siv cov low-hydrogen hom vuam hlau xws li H13Mn2MoA lossis H13Mn2TiA rau vuam. Preheating kev kho mob yuav tsum tau ua ua ntej welding, lub preheating kub yog 150 degree -250 degree, thiab interlayer kub yuav tsum tsis txhob qis dua lub preheating kub thaum lub sij hawm vuam. Tom qab vuam yuav tsum tau dehydrogenation kev kho mob, uas yog, ntawm 200 degree kom tswj tau ntau tshaj 2 teev.
4. Resistance vuam: qhov chaw vuam lossis projection vuam txheej txheem rau kev sib txuas. Spot vuam nrog ib qho tshwj xeeb electrode rau kev ua haujlwm, convex vuam nrog lub pob haum raws li qhov kev sib txuas. Vuam yuav tsum tau ua raws li qhov xwm txheej tiag tiag los xaiv qhov tsim nyog tam sim no thiab electrode siab rau vuam.
