Puas yog Zinc Layer Evaporate Thaum Vuam ntawm Galvanized Sheet? Puas yuav muaj pores lossis tawg tom qab vuam?

Thaum lub sij hawm vuam ntawm galvanized ntawv, zinc txheej yuav evaporate thiab tej zaum yuav muaj pores los yog tawg tom qab vuam. Hauv qab no yog cov lus qhia ntxaws ntxaws rau koj:

Evaporation ntawm Zinc Txheej

Cov ntsiab lus kub ntawm zinc yog qhov tsawg, txog 907 ℃, thiab kub kub yog tsim thaum lub sij hawm vuam txheej txheem. Thaum lub vuam kub qhov chaw ua rau ntawm daim ntawv galvanized, nws qhov kub thiab txias tshaj qhov kub ntawm zinc. Yog li ntawd, thaum lub sij hawm vuam txheej txheem, zinc nyob rau hauv lub galvanized txheej yuav sai sai evaporate. Ua ib qho piv txwv arc vuam, qhov nruab nrab kub ntawm arc tuaj yeem ncav cuag 5000-8000 ℃. Nyob rau hauv qhov kub kub, zinc yuav sai sai evaporate los ua zinc vapor.

Yog vim li cas rau pore tsim

Kev cuam tshuam ntawm zinc vapor: Yog tias zinc vapor tsim los ntawm zinc evaporation tsis tuaj yeem khiav tawm hauv lub sijhawm thaum lub sijhawm txias thiab solidification txheej txheem ntawm cov hlau molten, nws yuav tsim pores nyob rau hauv weld seam. Lub cim ntawm zinc vapor nce cov roj cov ntsiab lus nyob rau hauv lub pas dej ua ke molten, thiab ceev ceev ntawm lub pas dej molten tiv thaiv cov roj los ntawm kev tawm hauv lub sij hawm, ua rau cov porosity defects.

Hydrogen pores: Cov dej noo thiab cov roj stains nyob rau hauv qhov chaw vuam decompose ntawm qhov kub siab los tsim cov pa roj hydrogen, thaum zinc vapor kuj tuaj yeem ua rau cov huab cua nyob ib puag ncig los tsim cov roj hydrogen. Lub solubility ntawm hydrogen txo qis thaum lub sij hawm txias ntawm lub pas dej ua ke, thiab yog tias nws tsis tuaj yeem khiav txaus, hydrogen pores yuav tsim.

Yog vim li cas rau cracking

Kub tawg: Zinc thiab hlau yuav tsim tsawg melting point eutectic, uas yuav tsim ib tug ua kua zaj duab xis ntawm lub grain ciam teb thaum lub weld hlau txias thiab shrinks, tsis muaj zog lub zog ntawm cov nplej. Thaum cov hlau vuam raug rau ib qho kev ntxhov siab tensile, nws yog ib qho yooj yim los tsim cov kub tawg hauv cov cheeb tsam tsis muaj zog.

Txias tawg: Lub vuam kev ntxhov siab tsim tawm thaum lub sij hawm vuam txheej txheem thiab lub zog ntawm zinc ntsiab ntawm cov microstructure thiab cov khoom ntawm cov hlau vuam tuaj yeem ua rau kom cov tawv nqaij ntawm cov hlau weld. Thaum lub vuam yog txias kom qis dua, cov kab nrib pleb txias tuaj yeem tshwm sim vim muaj kev ntxhov siab. Tshwj xeeb tshaj yog nyob rau hauv cov qauv uas muaj rigidity siab los yog thaum vuam txheej txheem tsis tau xaiv kom zoo, cov kab nrib pleb txias yuav tshwm sim.

Kev tiv thaiv kev ntsuas

Kev tshem tawm ntawm Zinc Txheej: Ua ntej vuam, cov txheej txheem xws li tshuab polishing thiab tshuaj txhuam hniav tuaj yeem siv los tshem tawm cov zinc txheej los ntawm qhov chaw vuam, txo cov cim ntawm zinc vapor thiab yog li txo qhov tshwm sim ntawm porosity thiab tawg.

Choosing appropriate welding methods , such as laser welding, tungsten inert gas welding, and other welding methods with high energy density and relatively low heat input, can reduce zinc evaporation and welding heat affected zone, and reduce the possibility of porosity and cracking.

Tswj vuam tsis: Tsim nyog kho vuam tam sim no, qhov hluav taws xob, vuam ceev thiab lwm yam tsis zoo kom tsis txhob siv vuam vuam ntau dhau, txo cov zinc evaporation thiab overheating ntawm vuam hlau, thiab tiv thaiv kev tsim ntawm pores thiab tawg.

Preheating thiab Slow Cooling: Kev ua kom zoo ntawm cov khoom siv welded tuaj yeem txo qhov kev ntxhov siab ntawm vuam thiab txo qhov tshwm sim ntawm cov kab mob khaub thuas. Tom qab vuam, yuav tsum tau ua kom txias qeeb, xws li npog cov vuam nrog cov khoom siv rwb thaiv tsev kom cov vuam kom txias maj mam, uas yog qhov zoo rau kev khiav tawm roj thiab txo qhov tsim ntawm qhov hws thiab tawg.

Yog tias koj xav tau lub tshuab vuam, thov hu rau Ms. Zhao

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