Cov pa roj carbon tsawg yog cov hlau uas muaj cov pa roj carbon tsawg dua 0.25%. Nws tseem hu ua me me hlau vim nws tsis tshua muaj zog thiab hardness. Nws suav nrog feem ntau ntawm cov pa roj carbon zoo tib yam steel thiab ib feem ntawm cov pa roj carbon zoo, uas yog siv rau kev tsim vaj tsev yam tsis muaj kev kho cua sov, thiab qee qhov yog siv rau cov khoom siv tiv thaiv kev tiv thaiv tom qab kev kho cua sov xws li carburizing thiab nitriding. Cov qauv qis carbon steel annealed yog ferrite thiab ib qho me me ntawm pearlite, uas tsis tshua muaj zog thiab hardness, thiab zoo plasticity thiab toughness. Yog li ntawd, nws yog txias-tsim zoo, thiab tuaj yeem raug ua haujlwm txias xws li crimping, dabtsi yog khoov, xuas nrig ntaus, ncab, thiab lwm yam.; nws yooj yim rau forge, weld, thiab lwm yam. Vim yog cov ntsiab lus ntawm cov pa roj carbon tsawg, cov ntsiab lus ntawm alloying ntsiab Mn thiab Si tsis siab. Feem ntau, nws muaj qhov zoo weldability thiab tsis ua rau hardening vim ceev ceev ntawm vuam thermal voj voog tab sis cov ntaub so ntswg embrittlement. Yog li ntawd, cov vuam uas muaj qhov tuab ntawm tsawg dua 70 hli feem ntau tsis tas yuav tsum tau preheated ua ntej vuam, thiab nws tsis tsim nyog los tswj qhov kub ntawm interlayer. Txawm li cas los xij, rau cov txheej txheem vuam tseem ceeb xws li boilers thiab cov hlab ntsha siab, nws yog ib qho tsim nyog yuav tsum xav txog qhov preheating thiab tswj qhov kub ntawm interlayer.
Tsawg carbon hlau tuaj yeem welded los ntawm yuav luag txhua txoj kev vuam. Kev khi tuaj yeem lav vuam zoo, xws li: electrode arc vuam, submerged arc vuam, argon arc vuam, theem nrab vuam, flux cored hlau gas shielded vuam, electroslag vuam, plasma arc vuam, laser vuam, hluav taws xob kuj vuam, txhuam vuam, brazing, gas welding, thiab lwm yam. Tsawg-carbon steel vuam yog feem ntau siv rau electrode arc vuam. Lub hauv paus ntsiab lus ntawm kev siv cov hlau tsis tshua muaj carbon rau vuam rods feem ntau yog lub hauv paus ntsiab lus ntawm kev sib npaug ntawm lub zog. Feem ntau, cov welding rods ntawm E43 × × series tuaj yeem siv tau, uas tuaj yeem xaiv raws li cov khoom siv tshwj xeeb, thauj khoom thiab ib puag ncig; Rau cov qauv tseem ceeb dua lossis cov qauv nrog cov txheej txheem thauj khoom nyuaj, cov khoom siv qis hydrogen vuam yuav tsum tau siv ntau li ntau tau. Rau kev xaiv cov khoom siv hluav taws xob qis qis, xa mus rau JB/T4709-2007. Feem ntau siv cov khoom siv hluav taws xob tsawg-carbon steel welding yog pom hauv daim duab 1.
Kev npaj ntawm cov pa roj carbon tsawg tsawg tuaj yeem ua tau los ntawm txoj kev ua haujlwm txias lossis kev ua haujlwm kub. Lub vuam zawj yuav tsum tau khaws cia tiaj tus, tsis muaj kab nrib pleb, delamination, slag suav nrog, thiab lwm yam, roj stain thiab xeb nyob rau hauv thaj tsam ntawm 20 ~ 30mm ntawm ob sab ntawm qhov zawj. Ntxuav impurities xws li slag thiab dej yog ntxuav. Cov electrode yog qhuav raws li tau teev tseg. Yog tias nws yog huab cua txias rau lub caij ntuj no, nws yuav tsum tau preheated 50 ~ 100 degree thaum vuam tuab qhov chaw thiab cov qauv nruj. Qhov chaw vuam ntawm cov pa roj carbon tsawg yog tib yam li cov vuam ib txwm. Qhov chaw vuam tsis tuaj yeem tawg, txwv tsis pub nws yuav tsum tau rov welded; ob qhov kawg ntawm qhov chaw ntawm qhov chaw vuam welded rau hauv qhov chaw ruaj khov yuav tsum tau ua kom yooj yim rau lub arc. Feem ntau, lub arc yuav tsum tau coj nyob rau hauv lub arc khiav los yog zawj. Lub arc yuav tsum tsis txhob arced ntawm qhov tsis-welded, thiab lub arc qhov yuav tsum tau sau thaum lub arc yog extinguished. Txhua qhov vuam yog welded sai li sai tau kom tsis txhob vuam cuam tshuam. Rau cov khoom tseem ceeb, qhov kub ntawm lub interlayer yuav tsum tsis txhob tshaj qhov kev teev tseg thaum lub sij hawm vuam txheej txheem; Thaum lub vuam yog preheated, lub interlayer kub yuav tsum tau tswj tsis qis tshaj qhov preheating kub.
Galvanized steel los xij yog ib qho nyuaj rau vuam hauv cov hlau tsis tshua muaj hlau. Qhov laj thawj tseem ceeb yog tias txheej txheej galvanized coj vuam tawg thiab stomata rhiab heev rau vuam, zinc evaporation thiab soot, oxide slag, plating zinc txheej melts thiab rhuav tshem. Tsawg carbon steel galvanized steel ntawv tuaj yeem welded los ntawm phau ntawv arc vuam, roj hlau arc vuam, argon arc vuam thiab hluav taws xob tsis kam vuam. Rau phau ntawv arc vuam, zawj yuav tsum tau qhib kom zoo ua ntej vuam, thiab txheej txheej galvanized ze ntawm qhov zawj yuav tsum tau muab tshem tawm. Txoj kev tshem tawm tuaj yeem yog nplaim taws ci lossis sandblasting. Cov electrode raug xaiv kom ze li sai tau rau lub hauv paus hlau. J421 / J422 / J423 vuam pas nrig feem ntau nyiam; rau galvanized steel los xij nrog qib zog ntawm 500 MPa lossis ntau dua, E5001 / E5003 vuam rods yuav siv tau; Rau cov ntawv hlau galvanized nrog lub zog ntawm 600 MPa lossis ntau dua, E6013 / E5503 / E5513 vuam rods yuav tsum tau siv. Thaum vuam, siv luv luv arc kom ntau li ntau tau, tsis txhob viav vias, tiv thaiv lub melting cheeb tsam ntawm galvanized txheej los ntawm expanding, kom ntseeg tau cov corrosion kuj ntawm cov vuam thiab txo cov pa luam yeeb.
