Zvakajairwa Kukanganisa muMagnesium Alloy Welding

(1) Kristi yakakora

Magnesium ine yakaderera kunyungudika uye yakakwirira yekupisa conductivity. A high-power welding heat sosi inodiwa panguva yewelding. Iyo weld uye pedyo-seam nzvimbo dzinowanzoita kupisa, kukura kwezviyo, kupatsanurwa kwekristaro uye zvimwe zviitiko, izvo zvinoderedza kushanda kwakabatana.

(2) Oxidation uye evaporation

Magnesium yakanyanya oxidizing uye inosanganiswa nyore neokisijeni. Zviri nyore kuumba MgO panguva yekugadzira welding. MgO ine nzvimbo yakakwira yekunyungudika (2 500 ℃) uye yakakwira density (3. 2 g/cm-3), uye zviri nyore kugadzira maflakes madiki muweld. Solid slag inclusions haisi kungotadzisa zvakanyanya kuumbwa kwe weld, asiwo kuderedza kushanda kweweld. Pakupisa kwekushisa kwepamusoro, magnesium inogona kusanganiswa nyore nenitrogen mumhepo kuumba magnesium nitride. Magnesium nitride slag kuisirwa kuchakonzerawo kudzikira kwepurasitiki yesimbi ye weld uye kushatisa kuita kwakabatana. Iyo yekubikira poindi ye magnesium haina kukwirira (1100 ℃) uye iri nyore kunyungudika pasi pekushisa kwepamusoro kwearc.

(3) Kupisa nekudonha kwezvikamu zvitete

Kana welding zvidimbu zvitete, nekuda kwekunyungudika kwakadzikira kwemagnesium alloy uye kwakakwira kunyunguduka kwemagnesium oxide, izvo zviviri hazvisi nyore kusanganiswa, izvo zvinoita kuti zviome kuona kunyunguduka kweiyo weld seam panguva yekushanda kwewelding. Sezvo tembiricha inokwira, ruvara rwechidziva chakanyungudutswa hachichinji zvakanyanya, zvichiita kuti riite nyore kupisa nekudonha.

(4) Kushushikana kwekushisa uye kutsemuka

Magnesium uye magnesium alloys ine yakakwira coefficient yekuwedzera kwekupisa, kanenge kaviri iyo yesimbi uye 1 Kaviri, zviri nyore kukonzera kwakakosha welding kusagadzikana uye deformation panguva yewelding process. Magnesium inoumba nyore yakaderera nzvimbo yekunyungudika eutectic ine zvimwe zvinhu zvealloying (seCu, Al, Ni, nezvimwewo) (seMg Cu eutectic tembiricha ye480 ℃, Mg Al eutectic tembiricha ye430 ℃, Mg Ni eutectic tembiricha ye508 ℃) , ine yakafara brittle tembiricha renji uye nyore kuumbwa kweanopisa makatsemuka. Tsvagiridzo yakaona kuti kana w (Zn)>1%, inowedzera kupisa kwemafuta uye inogona kukonzera kutsemuka kwewelding. Kuwedzera w (Al) ≤ 10% kune magnesium inogona kunatsa saizi yezviyo zve weld uye kuvandudza weldability. Magnesium alloys ane hushoma hweT ane yakanaka weldability uye haana tsika yekutsemuka.

(5) Stomata

Hydrogen pores inogadzirwa zviri nyore panguva ye magnesium welding, uye kunyungudika kwehydrogen mu magnesium zvakare kunodzikira zvakanyanya nekudzikira tembiricha.

(6) Magnesium nema alloys ayo anowanzoita oxidation uye kupiswa panguva yewelding munzvimbo yemhepo, uye inoda inert gasi kana kudzivirirwa kweflux panguva yekubatanidza welding ·