Qhov tseem ceeb ntawm Preheating ua ntej Vuam thiab kev kho cua sov tom qab vuam

1. Lub luag haujlwm tseem ceeb ntawm preheating ua ntej vuam yog raws li hauv qab no:

(1) Preheating tuaj yeem ua kom qis qis qis tom qab vuam, uas yog qhov zoo rau kev khiav tawm ntawm diffuse hydrogen hauv cov hlau vuam kom tsis txhob muaj hydrogen tawg. Nws kuj txo cov degree ntawm hardening ntawm weld thiab tshav kub-cuam tshuam cheeb tsam thiab txhim kho qhov tawg tsis kam ntawm welded sib koom.

(2) Preheating txo welding kev nyuaj siab. Uniform hauv zos preheating lossis tag nrho cov preheating tuaj yeem txo qhov kub ntawm qhov sib txawv ntawm cov khoom ua haujlwm welded hauv thaj chaw vuam (tseem hu ua kub gradient). Qhov no txo ​​qhov kev ntxhov siab ntawm vuam ntawm ib sab, thiab ntawm qhov tod tes, txo qhov vuam strain tus nqi, uas yog qhov tsim nyog kom tsis txhob vuam tawg.

(3) Preheating tuaj yeem txo qhov constriction ntawm cov qauv welded, tshwj xeeb tshaj yog pom tseeb kom txo cov constriction ntawm lub kaum sab xis sib koom, nrog rau qhov nce ntawm preheating kub, tus nqi tawg yuav txo.

Preheating kub thiab interlayer kub xaiv tsis yog tsuas yog hais txog cov tshuaj muaj pes tsawg leeg ntawm hlau thiab electrode, tab sis kuj nrog rigidity ntawm welded qauv, welding txoj kev, ambient kub, thiab lwm yam, yuav tsum tau txiav txim siab tom qab txiav txim siab cov yam ntxwv no. Tsis tas li ntawd, lub uniformity ntawm preheating kub nyob rau hauv cov kev taw qhia ntawm steel phaj thickness thiab nyob rau hauv lub weld cheeb tsam muaj ib tug tseem ceeb cuam tshuam rau qhov txo ntawm vuam kev nyuaj siab. Qhov dav ntawm lub hauv paus preheating, yuav tsum tau raws li cov kev txwv ntawm welded workpiece, feem ntau yuav tsum yog peb npaug ntawm phab ntsa thickness nyob ib ncig ntawm lub weld cheeb tsam, thiab yuav tsum tsis txhob yuav tsawg tshaj li 150-200 hli. Yog hais tias lub preheating tsis sib xws, tsis tsuas yog tsis txo qhov kev ntxhov siab ntawm vuam, tab sis yuav tshwm sim ua rau kom cov vuam kev nyuaj siab.

2. Kev kho cua sov tom qab vuam

Lub hom phiaj ntawm kev kho cua sov tom qab vuam yog peb zaug: kev tshem tawm hydrogen, tshem tawm cov kev ntxhov siab ntawm vuam, thiab txhim kho lub koom haum vuam thiab kev ua haujlwm tag nrho.

Tom qab-weld hydrogen tshem tawm kev kho mob, hais txog kev kho cua sov qis tom qab ua tiav ntawm vuam, lub vuam tseem tsis tau txias kom qis dua 100 degree. General specifications rau cua sov rau 200 ~ 350 degree, tuav 2-6 teev. Lub luag haujlwm tseem ceeb ntawm kev kho tom qab vuam dehydrogenation yog txhawm rau txhawm rau txhawm rau khiav tawm ntawm hydrogen hauv thaj chaw vuam thiab tshav kub, rau kev tiv thaiv cov hlau tsis tshua muaj hlau vuam los tsim cov kab nrib pleb zoo heev.

Nyob rau hauv cov txheej txheem vuam, vim qhov tsis sib xws ntawm cov cua sov thiab cua txias, nrog rau cov khoom siv nws tus kheej los tsim cov kev txwv lossis kev txwv sab nraud, thaum kawg ntawm kev ua haujlwm vuam, hauv cov khoom siv yuav ib txwm tsim kev ntxhov siab welding. Vuam kev nyuaj siab nyob rau hauv lub tivthaiv, yuav txo tau qhov tseeb bearing muaj peev xwm ntawm lub welded ob leeg cheeb tsam, uas ua rau cov yas deformation, thiab nyob rau hauv loj heev, yuav ua rau kev puas tsuaj ntawm cov khoom.

Kev ntxhov siab rau kev kho cua sov yog ua kom cov welded workpiece nyob rau hauv lub siab kub lub xeev, nws yield zog txo, kom ua tiav lub hom phiaj ntawm so ntawm vuam kev nyuaj siab. Muaj ob txoj hauv kev uas feem ntau siv: ib qho yog tag nrho cov kub-kub tempering, uas yog, lub vuam tag nrho rau hauv lub qhov cub cua sov, maj mam rhuab mus rau qhov kub thiab txias, thiab tom qab ntawd tuav rau ib lub sij hawm, thiab thaum kawg txias nyob rau hauv lub qhov cub. cua los yog hauv qhov cub. Nrog rau txoj kev no tuaj yeem tshem tawm 80% -90% ntawm kev ntxhov siab vuam. Lwm txoj kev yog lub zos kub-kub tempering, uas yog, tsuas yog cov weld thiab nws cov cheeb tsam nyob ze yog rhuab, thiab ces maj mam txias kom txo tau lub ncov ntawm lub vuam kev nyuaj siab, thiaj li hais tias cov kev nyuaj siab faib yog tus du, thiab ua si ib feem nyob rau hauv lub ncov ntawm vuam kev nyuaj siab. tshem tawm lub hom phiaj ntawm vuam kev nyuaj siab.

Qee cov ntaub ntawv hlau hlau tom qab vuam, nws cov welded pob qij txha yuav tshwm sim hardened lub koom haum, thiaj li hais tias cov khoom ntawm cov khoom deteriorate. Tsis tas li ntawd, cov ntaub so ntswg hardened nyob rau hauv vuam kev nyuaj siab thiab lub luag hauj lwm ntawm hydrogen, tej zaum yuav ua rau kev puas tsuaj ntawm kev sib koom tes. Yog tias tom qab kev kho cua sov, lub koom haum metallurgical ntawm kev sib koom ua ke tau txhim kho, cov yas thiab cov tawv tawv ntawm cov welded sib koom ua ke tau zoo dua qub, yog li kev txhim kho cov khoom siv sib txuas ntawm cov khoom sib txuas.