1.Yog li cas ua tau cov lus thiab kev coj dawb huv ntawm cov khoom siv cuam tshuam rau kev vuam zoo ntawm Q355B?
Ntau dua cov txiaj ntsig pa roj carbon ntau ntxiv rau kev nyiam ntawm cov cua sov -} kev nyuaj, ua rau nws mob siab rau kev tawg.
Cov Ntaub Ntawv Sulfur Cov Sulfur pheej tsawg - yaj sulfides (xws li "kub brittleness" nyob rau hauv weld thiab cov tsos ntawm kub kub.
Kev sib xyaw tsis ncaj (xws li hauv zos cov ntsiab lus tsawg) txo qis ntawm lub haz, ua rau nws tsis tshua muaj kev ntxhov siab.
2.YHy Niam Txiv Thickness cuam tshuam rau Vuam Zoo?
Thick plates (>20mm): Tshav kub tau yooj yim nqus los ntawm cov khoom siv hauv paus thaum lub sijhawm ua kom txias dua (martension), thiab muaj kev pheej hmoo siab dua ntawm kev tawg. Tawv phaj vuam tseem yuav tsum tau ntau tus dhau thiab ntau txheej. Kev tsis raug cuam tshuam kev tswj qhov kub tuaj yeem ua rau muaj kev ntxhov siab ntxiv.
Daim hlau nyias nyias (<6mm): Excessive heat input (e.g., excessive current) can easily cause burn-through and deformation when the thickness is too thin. Otherwise, lack of fusion may occur.
3.Qhov ua li cas txuam ntawm kev vuam cov ntaub ntawv cuam tshuam rau kev sib tw zoo?
Lub zog tsis muaj zog: Siv E43 series hluav taws xob tsawg dua los yog sib npaug ntawm Weld Q355B (hauv paus
Ntau dhau hydrogen cov ntsiab lus: Siv cov tshuaj acidic ntawm hydrose (xws li E4303) tuaj yeem nkag rau hauv weld thiab ua rau hydrogen -}}}}}}}}}}}}} ua rau muaj cov kab nrib pleb.
Cov Roj Tsis Txaus Siab / Kev Tiv Thaiv Kev Tiv Thaiv / Kev Siv Tsis Txaus Siab Blux rau HJ231) lossis tsis muaj roj purity rau cov vuam vuam (sib xab ua purity<99.5%) can lead to inadequate deoxidation in the weld, resulting in porosity and slag inclusions.
4.Him ua li cas ib puag ncig qee qhov cuam tshuam rau kev siv vuam zoo?
Thaj kub cua sov
Tsawg kub (<0°C) accelerate the cooling of welded joints. Even with preheating, the heat-affected zone (HAZ) cools 30%-50% faster than at room temperature, significantly increasing the tendency to harden and the risk of cold cracking. Furthermore, low temperatures increase the brittleness of the base metal, making welding stress more susceptible to "low-temperature brittle fracture."
Ambient noo
High humidity (>80%): noo noo nyob rau hauv cov pa hlau ua ke, lossis hluav taws xob ntxiv, lossis vuam hlau, decomposing rau hauv hydrogen rau hauv hydrogen thaum lub sij hawm vuam. Cov hydrogen no nkag mus rau hauv weld thiab cov ntawv "thooj hydrogenible hydrogen." Thaum lub diffusible hydrogen cov ntsiab lus ntau dua 2ml / 100g (tus nqi tseem ceeb rau kev tsim txom nyob rau hauv kev ntxhov siab, kev ua hydrogen {}}}} ua rau cov kab nrib pleb. Huab cua ceev thiab airflow
Thaum lub sij hawm cov roj thaiv hluav taws xob vuam (co₂, mig vuam), huab cua nrawm dua li 8 m / s yuav rhuav tshem cov kev tiv thaiv roj "tiv thaiv (O₂, n₂) rau hauv lub pas dej weld:
O₂ reacts nrog hlau nyob hauv lub pas dej weld los ua cov oxides (xws li feo), ua rau slag inclusions thiab porosity hauv weld;
N₂ dissolves nyob rau hauv weld, sib sau "nitrogen pores" (me me, dispersed pores) thaum txias txias, txo weld lub zog.
5.Qhov yog tus tub ntxhais tseem ceeb uas cuam tshuam rau cov vuam zoo ntawm Q355B?
Lub ntsiab lus ntawm Q355B Weld zoo lus dag hauv "Tswj cov kev sib txuam ntawm kev caij sov thiab txo cov ntsiab lus} Txhua yam tseem ceeb ua rau ob lub hom phiaj tseem ceeb:
Zam kev tawv me microstructure hauv tshav kub -}} cuam tshuam thaj chaw (ua tiav los ntawm preheating thiab tswj kev tawm tswv yim thaum tshav kub kub);
Txo cov ntsiab lus hydrogen cov ntsiab lus thiab cov kev ntxhov siab uas tau tshaj tawm (ua tiav los ntawm kev ua kom qhuav, ua ntej {}} weld tu, thiab kev nyuaj siab pab txhawb nqa).
Los ntawm kev tsom mus rau ob lub hom phiaj thiab cov txheej txheem tswj hwm "cov txheej txheem kev ua haujlwm, kev kho mob rau ib puag ncig, thiab kev ua haujlwm zoo Q355B Weld pob qij txha tuaj yeem ua tiav.