Qhov tseem ceeb ntawm preheating ua ntej welding thiab annealing tom qab vuam

Qhov tseem ceeb ntawm preheating ua ntej welding thiab annealing tom qab vuam

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Kev vuam ntawm cov khoom tseem ceeb, cov hlau alloy, thiab cov khoom tuab yuav tsum tau preheating ua ntej vuam. 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 ntawm qhov kev sib txuas tom qab vuam, uas yog qhov zoo rau kev khiav tawm ntawm diffused hydrogen nyob rau hauv cov hlau vuam thiab zam cov tiam ntawm hydrogen induced tawg. Nyob rau tib lub sijhawm, nws kuj txo cov degree ntawm hardening ntawm weld seam thiab tshav kub cuam tshuam cheeb tsam, thiab txhim kho qhov tawg tsis kam ntawm welded sib koom.

(2) Preheating tuaj yeem txo qhov kev ntxhov siab ntawm vuam. Uniform hauv zos preheating lossis tag nrho preheating tuaj yeem txo qhov kub ntawm qhov sib txawv (tseem hu ua kub gradient) ntawm qhov chaw welded hauv cheeb tsam vuam. Nyob rau hauv txoj kev no, ntawm ib sab, vuam kev nyuaj siab yog txo, thiab ntawm qhov tod tes, qhov vuam strain tus nqi yog txo, uas yog conducive kom tsis txhob muaj qhov tshwm sim ntawm vuam tawg.

(3) Preheating tuaj yeem txo qhov kev txwv ntawm cov qauv vuam, tshwj xeeb tshaj yog rau cov pob qij txha. Raws li qhov kub ntawm preheating nce, qhov tawg tshwm sim tsawg zuj zus.

Kev xaiv ntawm preheating kub thiab interlayer kub tsis yog tsuas yog hais txog cov tshuaj muaj pes tsawg leeg ntawm cov hlau thiab vuam pas nrig, tab sis kuj mus rau lub rigidity ntawm vuam qauv, welding txoj kev, ib puag ncig kub, thiab lwm yam. Cov yam tseem ceeb no yuav tsum tau comprehensively txiav txim siab ua ntej txiav txim. 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 txo welding kev nyuaj siab. Qhov dav ntawm lub hauv paus preheating yuav tsum tau txiav txim siab raws li qib ntawm kev txwv ntawm qhov welded ib feem. Feem ntau, nws yuav tsum yog peb npaug ntawm phab ntsa tuab nyob ib ncig ntawm thaj chaw weld thiab tsis tsawg dua 150-200 millimeters. Yog hais tias lub preheating tsis sib npaug, tsis tsuas yog nws yuav tsis txo cov vuam kev nyuaj siab, tab sis nws kuj yuav ua rau kom cov vuam kev nyuaj siab.

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