Q1: Cov ntsiab lus tseem ceeb hauv kev siv vuam rau S3555J2H cov yeeb nkab?
Thaum vuam S355j2H cov yeeb nkab, cov yeeb nkab steel, qis} hydrogen electrodes (xws li E70 1) lossis tog raj hlau vuam hlau (xws li S3NI1) yuav tsum tau siv. Lub preheat kub feem ntau 100 {{{- 150℃los txo txoj kev pheej hmoo ntawm kev tawg txias. Lub vuam tam sim no thiab voltage yuav tsum tau hloov kho raws li lub phab ntsa tuab. Nyias-walled kav (<10 mm) can be welded using TIG welding to reduce heat input. Slow cooling is recommended after welding, and stress relief annealing at 550-600°C is recommended if necessary. Furthermore, a process qualification according to EN 1011-2 is required to ensure that the mechanical properties of the weld match those of the base material.
Q2: Yuav ua li cas tuaj yeem hydrogen -}}}) yuav tsum zam thaum vuam s3555555 ... cov yeeb nkab steel?
Kev tiv thaiv ntawm hydrogen -}}) yuav tsum tswj hwm peb cov ntsiab lus hydrogen, thiab microstractures. Ua ntej vuam, kom huv si tshem cov roj thiab noo los ntawm cov zawj thiab siv lub ziab flux (350℃rau 1 teev). Preheating tuaj yeem qeeb tus nqi txias thiab tiv thaiv kev sib tsoo ntawm cov khoom siv martensite. Rau tuab - fawm} Cov vuam hlau, Fawm kib weeles, fawm vuam yuav tsum muaj, nrog tswj kev cuam tshuam kub (tsawg dua los yog sib npaug nrog 250 degree). Cov Post Tam Sim No - weld weld cua sov (200-250 degree) Cov kev kuaj nruj ua kom nruj (xws li UT) tuaj yeem tshawb xyuas microcracks ntawm qee theem thaum ntxov.
Q3: Tau S355j2H steel yeeb nkab txias - bent? Yuav tsum ceev faj dab tsi?
S355J2H steel pipe can be cold-bent, but the bend radius must be ≥ 2 times the pipe diameter to avoid cracking. Before bending, inspect the material for surface defects. Local preheating is recommended for thick-walled pipes (>15 hli). Residual kev ntxhov siab tuaj yeem tsim los tom qab kev sib tw txias thiab xav tau kev sib cav lossis kev kho cua sov. Rau siab - precision khoov (xws li rau cov chaw chassis), Mandrel lossis Hydroforming cov txheej txheem yog yuav tsum tau. Cov khoom siv neeg kho tshuab yuav tsum tau rov qab ua tiav tom qab kev ua, tshwj xeeb tshaj yog cov kev cuam tshuam nyuaj, uas yuav raug txo vim deformation.
Q4: Cov yam ntxwv zoo li cas ntawm kev machining (tig, laum) rau s355j2h steel yeeb nkab? Thaum kev siv S355j2h, nws raug pom zoo kom siv cov cuab yeej carbide (xws li ISO P20 - p30) ntawm kev txiav ceev ntawm 80-120 m / min. Vim nws cov kev nyuaj (tsawg dua lossis sib npaug nrog 170 HBW), nti tawg ua tau zoo heev, tab sis ua haujlwm tawv heev yuav tsum tau txiav txim siab. Siv cov emulsion txias thaum lub taub lim kom tiv thaiv kev kub ntxhov thiab cov khoom hnav. Rau cov-ntim tshuab sib nraus, ua kom zoo rau pub tus nqi pub (0.1-0.3 mm / r) tuaj yeem sib npaug kev ua tau zoo thiab cuab tam lub neej.
Q5: Yuav ua li cas Thermal txiav (ntshav txiav (ntshav lossis nplaim taws) ua rau s355j2h steel yeeb nkab?
Nplaim txiav ntawm s355j2h yuav tsum muaj roj lossis roj av, preheating rau 200 degree}} be} cuam tshuam cheeb tsam (Haz). Ntshav txiav yog qhov haum rau nyias -} cov kav hlau walled (<20 mm), resulting in smoother cuts. Post-cutting edges require grinding to remove slag and microcracks. For critical components, magnetic particle testing (MT) is required on the cut surfaces. CNC cutting machines can improve accuracy and reduce subsequent processing.
