Q1: Ki sa ki pwen kle yo nan pwosesis la soude pou S355J2H tiyo asye?
Lè soude S355J2H tiyo asye, ki ba - elektwòd idwojèn (tankou E7018) oswa submerged fil soude ak soude (tankou S3NI1) ta dwe itilize. Tanperati a chofe se jeneralman 100 - 150 degre diminye risk pou yo fann frèt. Yo ta dwe ajiste aktyèl la ak vòltaj la dapre epesè miray la. Tiyo mens-ranpa (<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: Ki jan yo ka idwojèn - Cracking induit (HIC) evite lè soude S355J2H tiyo asye?
Prevansyon nan idwojèn - Cracking induit (HIC) mande pou kontwole twa faktè kle: kontni idwojèn, estrès kontrent, ak mikrostruktur sansib. Anvan soude, byen retire lwil oliv ak imidite soti nan Groove a epi sèvi ak yon flux siye (350 degre pou 1 èdtan). Chofe ka ralanti pousantaj la refwadisman ak anpeche fòmasyon martensit. Pou tiyo epè - ki gen gwo ranpa, soude kouch obligatwa, ak tanperati entèrmin kontwole (mwens pase oswa egal a 250 degre). Imedyat pòs - Weld chofaj (200-250 degre pou 2 èdtan) fasilite difizyon idwojèn ak chape. Tès rijid nondestructive (tankou UT) ka detekte microcracks nan yon etap bonè.
Q3: Èske S355J2H tiyo asye dwe frèt - Bent? Ki prekosyon ki nesesè?
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 mm). Ensiste rezidyèl yo ka pwodwi apre frèt koube epi mande pou Vibration aje oswa tretman chalè. Pou segondè - Precision koube (tankou pou pati otomobil chasi), mandrel oswa pwosesis idroforming yo gen obligasyon. Pwopriyete mekanik yo dwe teste apre tretman, espesyalman enpak severite, ki ka redwi akòz deformation.
Q4: Ki sa ki karakteristik sa yo nan D '(vire, perçage) pou S355J2H tiyo asye? Lè MACHINING S355J2H, li rekòmande pou itilize zouti carbure (tankou ISO P20 - P30) nan yon vitès koupe nan 80-120 m/min. Akòz dite modere li yo (mwens pase oswa egal a 170 HBW), pèfòmans chip kraze se ekselan, men travay tandans redi yo ta dwe konsidere. Sèvi ak emulsyon refwadisman pandan perçage pou anpeche surchof ak zouti mete. Pou machining wo-volim, optimize pousantaj la manje (0.1-0.3 mm/r) ka balanse efikasite ak lavi zouti.
Q5: Kouman se koupe tèmik (Plasma oswa flanm dife) fè pou S355J2H tiyo asye?
Koupe flanm dife nan S355J2H mande pou gaz pwopàn oswa natirèl, prechofe nan 200 degre pou misyon pou minimize redi nan chalè a - zòn ki afekte (HAZ). Plasma koupe se pi apwopriye pou mens - tiyo gwo ranpa (<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.
