Welded luj tshib nyob rau hauv stainless hlau yeeb fittings yuav ua rau corrosion thaum siv tsis raug. Tom qab corrosion tshwm sim nyob rau hauv welded stainless hlau luj tshib, thickness ntawm cov yeeb nkab phab ntsa luj tshib feem ntau yuav thinner thiab lub zos pits thiab pits tshwm. Kev txheeb xyuas txoj kev ntawm welded luj tshib tom qab corrosion: Lub hauv paus ntsiab lus ntawm kev sib nqus flux to detection yog raws li cov yam ntxwv ntawm cov hlau nplaum permeability siab ntawm ferromagnetic cov ntaub ntawv. Qhov sib nqus permeability ntawm corrosion tsis xws luag nyob rau hauv lub luj tshib welded yog ntau me dua li ntawm lub luj tshib welded. Lub luj tshib welded yog magnetized nyob rau hauv qhov kev txiav txim ntawm sab nraud magnetic teb. Thaum tsis muaj qhov tsis xws luag hauv lub luj tshib welded, feem ntau ntawm cov kab sib nqus ntawm lub zog dhau los ntawm cov yeeb nkab steel. Lub sijhawm no Cov kab sib nqus ntawm lub zog sib npaug sib npaug; Thaum muaj qhov tsis xws luag hauv lub luj tshib, cov kab sib nqus ntawm lub zog yog khoov, thiab qee cov kab hlau nplaum ntawm cov quab yuam tawm ntawm qhov chaw ntawm cov yeeb nkab steel. Los ntawm kev txheeb xyuas cov dej ntws tawm los ntawm qhov chaw ntawm lub luj tshib hlau nplaum, koj tuaj yeem txiav txim siab seb puas muaj qhov tsis xws luag. Txoj kev tshwj xeeb yoj acoustic yoj nrhiav kom tau txoj kev siv cov mem tes xav txog txoj cai ntawm cov nthwv dej tshwj xeeb los ntsuas qhov tuab ntawm cov yeeb nkab phab ntsa tom qab corrosion.
1. Preheating thiab txias txheej txheem ntawm welded luj tshib
a. Yog tias lub luj tshib stainless hlau tsis muaj kev ntxhov siab thaum lub sijhawm vuam, peb yuav tsum tau ua kev kho cua sov tom qab lub sijhawm no. Peb yuav tsum paub tias yog tias qhov kev ntxhov siab tsis tuaj yeem txo qis lossis nws yuav ua rau muaj kev phom sij rau qhov vuam, thiab nws tseem yuav cuam tshuam rau lub luj tshib stainless hlau tom qab siv, nws tseem yuav cuam tshuam rau lub luj tshib stainless hlau.
b. Nyob rau hauv qhov kev txiav txim ntawm kev kub ntxhov, vim tias stainless hlau lub luj tshib saum npoo ntawm qhov kub thiab txias yog qis dua cov tub ntxhais thaum pib thiab qhov kev cog lus ntau dua li cov tub ntxhais, ua rau cov tub ntxhais yuav ncav cuag. Thaum qhov txias tiav lawm, qhov ntim txias ntawm cov tub ntxhais yuav tsis tuaj yeem ua kom tsis muaj zog, ua rau lub luj tshib ntawm lub luj tshib tsis muaj zog. Ntu yog rub. Ntawd yog, nyob rau hauv qhov kev txiav txim ntawm kev kub ntxhov, txheej txheej ntawm lub workpiece yog compressed thiab cov tub ntxhais yog stretched nyob rau theem tom ntej.
c. Ntau hom hlau muaj qhov sib txawv ntawm qhov kub thiab txias, tab sis cov kauj ruam no feem ntau ua tiav thaum lub sij hawm vuam txheej txheem. Peb tuaj yeem kho qhov kub thiab txias thaum preheating stainless hlau luj tshib hauv cheeb tsam raws li qhov xav tau ntawm vuam.
d. Txhawm rau tiv thaiv cov kab nrib pleb los ntawm qhov tshwm sim ntawm lub luj tshib welded thaum siv, lub raj carbon yuav tsum tau preheated ua ntej tawm hauv lub hoobkas. Tom qab preheating, lub tshav kub cuam tshuam cheeb tsam ntawm nruab nrab carbon steel yuav txo tau, thiab preheating kuj yuav txhim kho lub plasticity ntawm welded luj tshib kuj yuav txo tau cov residual kev nyuaj siab tom qab welding tiav.
e. Thaum lub sij hawm cua sov thiab txias txheej txheem ntawm lub luj tshib welded, vim lub stainless hlau luj tshib tsis sib haum xeeb txias ceev thiab lub sij hawm ntawm lub nto txheej thiab cov tub ntxhais, ib tug kub sib txawv yog tsim, uas yuav ua rau uneven ntim expansion thiab contraction thiab ua kom muaj kev ntxhov siab, uas. yog, kub ntxhov siab.
