Zowonongeka Zodziwika mu Magnesium Alloy Welding

(1) Mwala wonyezimira

Magnesium imakhala ndi malo otsika osungunuka komanso matenthedwe apamwamba kwambiri. Kutentha kwamphamvu kwambiri kumafunika pakuwotcherera. Malo otsetsereka ndi pafupi ndi msoko amatha kutenthedwa, kukula kwa tirigu, kugawanika kwa kristalo ndi zochitika zina, zomwe zimachepetsa kugwira ntchito limodzi.

(2) Oxidation ndi evaporation

Magnesium ndi okosijeni kwambiri ndipo amalumikizana mosavuta ndi mpweya. Ndikosavuta kupanga MgO panthawi yowotcherera. MgO imakhala ndi malo osungunuka kwambiri (2 500 ℃) ndi kachulukidwe kwambiri (3. 2 g/cm-3), ndipo ndizosavuta kupanga ma flakes ang'onoang'ono mu weld. Kuphatikizika kolimba kwa slag sikungolepheretsa kwambiri mapangidwe a weld, komanso kumachepetsa magwiridwe antchito a weld. Pa kutentha kwambiri, magnesium imatha kuphatikizana mosavuta ndi nayitrogeni mumlengalenga kupanga magnesium nitride. Kuphatikizidwa kwa magnesium nitride slag kumapangitsanso kuchepa kwa pulasitiki ya chitsulo chowotcherera ndikuwonjezera magwiridwe antchito olowa. Kuwira kwa magnesiamu sikokwera (1100 ℃) ndipo ndikosavuta kusuntha ndi kutentha kwambiri kwa arc.

(3) Kuwotcha ndi kugwa kwa ziwalo zopyapyala

Powotcherera mbali zoonda, chifukwa cha kusungunuka kwa magnesium alloy komanso kusungunuka kwa magnesium oxide, ziwirizi siziphatikizana mosavuta, zomwe zimapangitsa kuti zikhale zovuta kuyang'ana kusungunula kwa msoko wa weld panthawi yowotcherera. Pamene kutentha kumakwera, mtundu wa dziwe losungunuka susintha kwambiri, zomwe zimapangitsa kuti likhale lotentha ndi kugwa.

(4) Kutentha kwa kutentha ndi ming'alu

Magnesium ndi ma magnesium alloys ali ndi kuchuluka kwamphamvu kwamafuta, pafupifupi kuwirikiza kawiri kuposa chitsulo ndi 1 Kawiri, ndikosavuta kuyambitsa kupsinjika kwakukulu pakuwotcherera komanso kupunduka panthawi yowotcherera. Magnesium imapanga eutectic yotsika kwambiri yokhala ndi zinthu zina zophatikizika (monga Cu, Al, Ni, etc.) (monga Mg Cu eutectic kutentha kwa 480 ℃, Mg Al eutectic kutentha kwa 430 ℃, Mg Ni eutectic kutentha kwa 508 ℃) , yokhala ndi kutentha kwakukulu kwa brittle komanso kupanga mosavuta ming'alu yotentha. Kafukufuku wapeza kuti w (Zn)> 1% imawonjezera kuphulika kwa matenthedwe ndipo imatha kuyambitsa ming'alu yowotcherera. Kuwonjezera w (Al) ≤ 10% ku magnesium kumatha kuyeretsa kukula kwambewu ya weld ndikuwongolera kuwotcherera. Magnesium alloys okhala ndi pang'ono a Th ali ndi weldability wabwino ndipo alibe chizolowezi chosweka.

(5) Mtima

Ma pores a haidrojeni amapangidwa mosavuta pakuwotcherera kwa magnesium, ndipo kusungunuka kwa haidrojeni mu magnesium kumachepanso kwambiri ndi kuchepa kwa kutentha.

(6) Magnesium ndi aloyi ake sachedwa makutidwe ndi okosijeni ndi kuyaka pa kuwotcherera mu mpweya chilengedwe, ndipo amafuna inert mpweya kapena chitetezo flux pa maphatikizidwe kuwotcherera ·