Stainless hlau 904L 1.4539

Cov txheej txheem vuam txheej txheem rau qib steel no yog:

• TIG Welding
• MAG-Vuam Khoom Hlau
• Arc vuam (E)
• Laser Bean Vuam
• Submerged Arc Welding (SAW)

Thaum xaiv cov hlau muab tub lim, qhov kev ntxhov siab corrosion yuav tsum tau saib xyuas, thiab. Kev siv cov hlau nplaum ntau dua tuaj yeem tsim nyog vim yog cov qauv nrum ntawm cov hlau vuam. Lub preheating yog tsis tsim nyog rau cov hlau no. Kev kho cua sov tom qab vuam feem ntau tsis zoo li qub. Austenitic steels tsuas muaj 30% ntawm cov thermal conductivity ntawm cov hlau tsis-alloyed. Lawv cov ntsiab lus fusion yog qis dua li cov hlau tsis-alloyed yog li cov hlau austenitic yuav tsum tau welded nrog cov cua kub qis dua li cov hlau tsis-alloyed. Txhawm rau kom tsis txhob overheating lossis hlawv-los ntawm cov ntawv nyias nyias, yuav tsum tau siv cov vuam ceev dua. Copper back-up daim hlau rau kev tshem tawm cov cua sov sai dua yog qhov ua haujlwm tau, tab sis, kom tsis txhob muaj cov kab nrib pleb hauv cov hlau, nws tsis raug tso cai rau saum npoo-fuse tooj liab rov qab phaj. Cov hlau no muaj ntau dua coefficient ntawm thermal expansion li non-alloyed steel. Nyob rau hauv kev twb kev txuas nrog ib tug phem thermal conductivity, yuav tsum tau ib tug ntau dua distortion. Thaum welding 1.4539 tag nrho cov txheej txheem, uas ua hauj lwm tawm tsam no distortion (xws li rov qab-kauj ruam welding, welding alternated on opposite sab nrog ob-V pob tw weld, assignment ntawm ob welders thaum lub Cheebtsam yog raws li loj) yuav tsum tau hwm notably. Rau cov khoom thicknesses tshaj 12 hli ob-V pob tw weld yuav tsum tau nyiam dua li ib-V pob tw weld. Lub kaum sab xis suav nrog yuav tsum yog 60 ° - 70 °, thaum siv MIG-welding txog 50 ° txaus. Yuav tsum zam kom tsis txhob muaj qhov sib txuam ntawm cov seams. Tack welds yuav tsum tau affixed nrog luv luv nrug ntawm ib leeg (tseem ceeb luv dua li cov hlau uas tsis yog-alloyed), thiaj li yuav tiv thaiv kom txhob muaj zog deformation, shrinking los yog flaking tack welds. Tom qab ntawd cov tacks yuav tsum tau grinded los yog tsawg kawg yog dawb los ntawm crater tawg. 1.4539 nyob rau hauv kev twb kev txuas nrog austenitic weld hlau thiab kub kub input qhov kev tiv thaiv los ntawm tshav kub tawg tshwm sim. Kev tiv thaiv kom sov tawg tuaj yeem raug kaw, yog tias cov hlau vuam muaj cov ntsiab lus qis ntawm ferrite (delta ferrite). Cov ntsiab lus ntawm ferrite mus txog 10% muaj cov txiaj ntsig zoo thiab tsis cuam tshuam rau corrosion feem ntau. Cov txheej txheej thinnest tshaj plaws yuav tsum tau welded (stringer hlaws txheej txheem) vim tias qhov txias txias dua txo qhov kev tiv thaiv kub kub. Qhov zoo dua txias txias yuav tsum tau aspired thaum vuam zoo li, kom tsis txhob muaj qhov tsis zoo rau intergranular corrosion thiab embrittlement. 1.4539 yog qhov tsim nyog rau laser beam vuam (weldability A raws li DVS bulletin 3203, ntu 3). Nrog lub vuam zawj dav me dua 0.3 hli raws li 0.1 hli cov khoom tuab siv cov hlau muab tub lim tsis tsim nyog. Nrog loj vuam grooves ib tug zoo xws li muab tub lim hlau yuav siv tau. Nrog kev zam oxidation nyob rau hauv seam nto laser beam welding los ntawm kev siv rov qab vuam, xws li helium li inert gas, vuam seam yog raws li corrosion resistant raws li lub hauv paus hlau. Tsis muaj qhov kub kub tawg rau qhov vuam seam tsis muaj, thaum xaiv cov txheej txheem siv tau. 1.4539 yog alos haum rau laser beam fusion txiav nrog nitrogen los yog nplaim taws txiav nrog oxygen. Cov npoo txiav tsuas muaj cov cua sov me me rau thaj tsam thiab feem ntau tsis muaj cov kab nrib pleb thiab yog li tsim tau zoo. Thaum xaiv cov txheej txheem tsim nyog, fusion txiav npoo tuaj yeem hloov pauv ncaj qha. Tshwj xeeb, lawv tuaj yeem welded yam tsis muaj kev npaj ntxiv. Thaum ua cov cuab yeej stainless nkaus xwb xws li txhuam hlau, pneumatic picks thiab lwm yam tau tso cai, thiaj li tsis ua rau muaj kev phom sij. Nws yuav tsum tsis txhob muab pov tseg rau hauv lub vuam seam cheeb tsam nrog oleaginous bolts los yog kub qhia crayons. Lub siab corrosion kuj ntawm no stainless hlau yog tsim los ntawm ib homogeneous, compact passive txheej ntawm qhov chaw. Annealing xim, nplai, slag residues, tramp hlau, spatters thiab zoo li yuav tsum tau muab tshem tawm, thiaj li yuav tsis ua puas lub passive txheej. Txhawm rau ntxuav cov txheej txheem txhuam, sib tsoo, pickling lossis blasting (hlau tsis muaj silica xuab zeb lossis iav spheres) tuaj yeem siv. Kev txhuam hniav tsuas yog siv cov txhuam hniav stainless hlau xwb. Pickling ntawm qhov chaw txhuam hniav yav dhau los yog ua los ntawm dipping thiab txau, txawm li cas los xij, feem ntau siv cov tshuaj txhuam los yog cov tshuaj daws. Tom qab pickling yuav tsum tau ua tib zoo yaug nrog dej.