Nā hemahema maʻamau i ka hoʻoheheʻe ʻana i ka Magnesium Alloy

(1) Ke aniani ʻeleʻele

He wahi heheʻe haʻahaʻa ka Magnesium a me ka conductivity thermal kiʻekiʻe. Pono ke kumu wela wiliwili kiʻekiʻe i ka wā wili. ʻO nā wahi weld a me nā wahi kokoke-seam e maʻalahi i ka wela, ka ulu ʻana o ka palaoa, ka hoʻokaʻawale kristal a me nā mea ʻē aʻe, e hōʻemi ana i ka hana hui.

(2) Oxidation a me ka evaporation

ʻO ka Magnesium ka mea hoʻokahe loa a maʻalahi e hui pū me ka oxygen. He mea maʻalahi ka hana ʻana i ka MgO i ka wā o ke kaʻina hana kuʻi. MgO kahi kiʻekiʻe heheʻe (2 500 ℃) a me ke kiʻekiʻe kiʻekiʻe (3. 2 g / cm-3), a he maʻalahi ke hana i nā liʻiliʻi liʻiliʻi i ka weld. ʻAʻole wale nā ​​​​mea hoʻokomo paʻa paʻa i keakea i ka hoʻokumu ʻana o ka weld, akā e hōʻemi hoʻi i ka hana o ka weld. Ma nā wela wili kiʻekiʻe, hiki ke hui maʻalahi ka magnesium me ka nitrogen i ka lewa e hana i ka magnesium nitride. ʻO ka hoʻokomo ʻana o ka Magnesium nitride slag e hoʻemi i ka plasticity o ka metala weld a hoʻonui i ka hana hui. ʻAʻole kiʻekiʻe ka helu hoʻolapalapa o ka magnesium (1100 ℃) a maʻalahi ke ea ma lalo o ke kiʻekiʻe o ka wela o ke arc.

(3) Puhi a hāʻule i nā ʻāpana lahilahi

I ka wā e wiliwili ai i nā ʻāpana lahilahi, ma muli o ka haʻahaʻa heheʻe o ka magnesium alloy a me ka helu hoʻoheheʻe kiʻekiʻe o ka magnesium oxide, ʻaʻole maʻalahi ka hui ʻana o nā mea ʻelua, e paʻakikī ke nānā i ke kaʻina hoʻoheheʻe o ka weld seam i ka wā o ka hana wili. Ke piʻi aʻe ka mahana, ʻaʻole e loli nui ka waihoʻoluʻu o ka loko i hoʻoheheʻe ʻia, e maʻalahi i ke ahi a hāʻule.

(4) Ke kaumaha wela a me nā māwae

ʻO nā mea hoʻoheheʻe magnesium a me ka magnesium he kiʻekiʻe kiʻekiʻe o ka hoʻonui ʻana i ka wela, ma kahi o ʻelua ʻelua o ke kila a me 1 ʻElua, maʻalahi ke hoʻoulu i ke koʻikoʻi wili a me ka deformation i ka wā o ke kaʻina hana. Hoʻokumu maʻalahi ka Magnesium i kahi eutectic haʻahaʻa me kekahi mau mea hoʻohuihui (e like me Cu, Al, Ni, etc.) (e like me Mg Cu eutectic wela o 480 ℃, Mg Al eutectic wela o 430 ℃, Mg Ni eutectic wela o 508 ℃) , me kahi ākea ākea ākea a me ka hana maʻalahi o nā māwae wela. Ua ʻike ʻia ka noiʻi ʻana i ka wā w (Zn)>1%, hoʻonui ia i ka brittleness thermal a hiki ke alakaʻi i nā māwae wili. ʻO ka hoʻohui ʻana i ka w (Al) ≤ 10% i ka magnesium hiki ke hoʻomaʻemaʻe i ka nui o ka palaoa o ka weld a hoʻomaikaʻi i ka weldability. ʻO nā mea hoʻoheheʻe Magnesium i loaʻa i kahi mea liʻiliʻi o Th he maikaʻi ka weldability a ʻaʻohe manaʻo e haki.

(5) Stomata

Hiki ke hana maʻalahi nā pores hydrogen i ka wā hoʻoheheʻe magnesium, a ʻo ka solubility o ka hydrogen i loko o ka magnesium e emi nui pū me ka emi ʻana o ka mahana.

(6) ʻO ka Magnesium a me kāna mau mea hoʻoheheʻe ʻia i ka oxidation a me ka hoʻopau ʻana i ka wā o ka wili ʻana i kahi ea, a koi aku i ke kinoea inert a i ʻole ka pale flux i ka wā fusion welding·