Cov txheej txheem dual tseem ceeb ntawm Preheating ua ntej vuam thiab kho cua sov tom qab vuam

Nyob rau hauv cov txheej txheem vuam, pre-welding preheating thiab tom qab vuam kub kho ob qhov txuas ua lub luag haujlwm tseem ceeb, lawv tsis tsuas yog cuam tshuam rau qhov zoo thiab kev ua haujlwm ntawm cov pob qij txha, tab sis kuj ncaj qha ntsig txog kev ruaj ntseg thiab kev nyab xeeb ntawm tag nrho cov qauv welded.
Ua ntej, qhov tseem ceeb ntawm preheating ua ntej vuam
Pre-welding preheating yog hais txog vuam ntawm lub workpiece yuav tsum tau welded ua ntej ib tug tej yam kub nyob rau hauv lub cua sov txheej txheem. Qhov tseem ceeb ntawm cov kauj ruam no feem ntau yog xav txog hauv cov hauv qab no:
1. qeeb qhov txias txias: preheating tuaj yeem ua kom txias txias tom qab vuam, yog qhov tsim nyog rau kev khiav tawm ntawm diffusion hydrogen hauv cov hlau vuam, yog li tsis txhob hydrogen tawg. Nyob rau tib lub sijhawm, nws txo cov degree ntawm hardening ntawm weld thiab tshav kub-cuam tshuam cheeb tsam thiab txhim kho qhov tawg tsis kam ntawm cov welded sib koom.
2. Txo cov kev ntxhov siab ntawm vuam: Los ntawm kev sib xyaw hauv zos preheating lossis tag nrho cov preheating, qhov sib txawv ntawm qhov kub thiab txias (kub gradient) ntawm cov welded workpieces nyob rau hauv qhov chaw vuam yuav raug txo, yog li txo qhov vuam kev nyuaj siab thiab vuam strain tus nqi, thiab pab kom tsis txhob vuam tawg.
3. Txo qhov txwv ntawm cov qauv welded: preheating kom txo qhov kev txwv ntawm lub kaum sab xis sib koom ua ke yog tshwj xeeb tshaj yog pom tseeb, nrog rau qhov nce hauv preheating kub, qhov tshwm sim ntawm cov kab nrib pleb yuav raug txo raws li.

Preheating kub thiab interlayer kub xaiv yuav tsum xav txog cov tshuaj muaj pes tsawg leeg ntawm steel thiab electrode, rigidity ntawm welded qauv, vuam txoj kev thiab ambient kub thiab lwm yam kom paub meej tias qhov zoo thiab kev ua tau zoo ntawm welded pob qij txha.
Qhov thib ob, qhov tseem ceeb ntawm kev kho cua sov tom qab vuam
Kev kho cua sov tom qab vuam yog hais txog kev ua tiav ntawm vuam, cov vuam sib txuas ntawm qhov kub thiab txias hauv kev kho cua sov thiab cua txias. Nws lub hom phiaj tseem ceeb suav nrog kev tshem tawm hydrogen, tshem tawm kev ntxhov siab ntawm vuam thiab txhim kho lub koom haum thiab kev ua tau zoo tag nrho ntawm vuam.
1. Kev tshem tawm hydrogen: Tom qab vuam, lub vuam tseem tsis tau txias kom qis dua 100 degree thaum qhov kev kho cua sov qis tuaj yeem ua kom cov vuam thiab kub-tsim thaj tsam hauv kev khiav tawm ntawm hydrogen, kom tsis txhob muaj cov hlau tsis tshua muaj hlau vuam vuam tawg.
2. Kev tshem tawm cov kev ntxhov siab ntawm vuam: Vuam kev ntxhov siab tsim los ntawm cov txheej txheem vuam yuav txo qhov muaj peev xwm ntawm qhov sib koom ua ke, ua rau cov yas deformation, thiab tseem ua rau kev puas tsuaj ntawm cov tswv cuab. Los ntawm qhov kub thiab txias tempering thiab lwm txoj kev kho cua sov, koj tuaj yeem ua rau lub vuam yield zog poob ntawm qhov kub thiab txias, kom ua tiav lub hom phiaj ntawm kev so ntawm vuam kev nyuaj siab.
3. Txhim kho lub koom haum thiab kev ua tau zoo tag nrho ntawm cov vuam: qee cov ntaub ntawv hlau alloy yuav tshwm sim tom qab vuam lub koom haum hardened, cuam tshuam rau cov khoom siv kho tshuab. Tom qab kev kho cua sov, lub koom haum metallurgical ntawm kev sib koom ua ke tau txhim kho, txhim kho cov yas, toughness thiab lwm yam khoom siv dav dav ntawm cov pob qij txha welded.
Nyob rau hauv luv luv, pre-welding preheating thiab post-welding tshav kub kev kho mob yog ob indispensable txuas nyob rau hauv lub vuam txheej txheem. Lawv xyuas kom meej tias qhov zoo thiab kev ua tau zoo ntawm cov pob qij txha welded ua tau raws li cov qauv tsim los ntawm kev tswj qhov kub thiab txias thiab lwm yam hauv cov txheej txheem vuam. Hauv kev xyaum, qhov tsim nyog preheating thiab kev kho cua sov tsis zoo thiab cov txheej txheem yuav tsum raug xaiv raws li cov xwm txheej tshwj xeeb.