Nūhou

ʻO ka noho ʻana o ka papa zinc ua lawe mai i kekahi mau pilikia i ka hoʻopili ʻana i ke kila galvanized. ʻO nā pilikia nui: ʻo ka hoʻonui ʻana i ka naʻau o ka welding māwae a me nā pores, zinc evaporation a me ka uahi, oxide slag inclusion, a me ka hoʻoheheʻe ʻana a me ka pōʻino o ka uhi zinc. I waena o lākou, ʻo ka welding crack, ea hole a me ka slag inclusion nā pilikia nui,
Weldability
(1) māwae
I ka wā wili, lana ka zinc hehee ma ka ʻili o ka wai hoʻoheheʻe a i ʻole ke kumu o ka weld. No ka mea, he haʻahaʻa loa ka helu heheʻe o ka zinc ma mua o ka hao, ʻo ka hao i loko o ka loko i hoʻoheheʻe ʻia e crystallize mua, a ʻo ka wavy zinc e infiltrate i loko o ia mea ma ka palena palaoa o ke kila, e alakaʻi ana i ka nāwaliwali o ka pilina intergranular. Eia kekahi, he mea maʻalahi ka hana ʻana i nā pūhui intermetallic brittle Fe3Zn10 a me FeZn10 ma waena o ka zinc a me ka hao, kahi e hoʻemi hou ai i ka plasticity o ka weld metala, no laila e maʻalahi ke haki ʻia ma ka palena o ka palaoa a hana i nā māwae ma lalo o ka hopena o ka hoʻopaʻa ʻana i ke koʻikoʻi koena.
Nā mea e pili ana i ka naʻau o ka māwae: ① Ka mānoanoa o ka papa zinc: ʻo ka ʻāpana zinc o ke kila galvanized he lahilahi a he liʻiliʻi ka naʻau o ka māwae, ʻoiai ka mānoanoa o ka papa zinc o ke kila wela wela a he nui ka naʻau. ② ʻO ka mānoanoa o ka mea hana: ʻoi aku ka nui o ka mānoanoa, ʻoi aku ka nui o ke koʻikoʻi kaohi ʻana a me ka ʻoi aku ka nui o ka naʻau. ③ Awāwa awāwa: āwāwa
ʻOi aku ka nui, ʻoi aku ka ʻike māwae. ④ Ke ala wiliwili: liʻiliʻi ka naʻau o ka māwae i ka wā e hoʻohana ʻia ai ka wiliwili arc manual, akā ʻoi aku ka nui i ka wā e hoʻohana ʻia ai ka hoʻoheheʻe kinoea CO2.
Nā ala e pale aku ai i nā māwae: ① Ma mua o ka wili ʻana, e wehe i ke ʻano V-like, Y-like a i ʻole X-like groove ma ke kūlana wili o ka pepa galvanized, e wehe i ka uhi zinc ma kahi kokoke i ke awāwa e ka oxyacetylene a i ʻole ke one puhi ʻana, a e kāohi i ke āpau ʻaʻole e nui loa, ma kahi o 1.5mm. ② E koho i nā mea wiliwili me ka haʻahaʻa Si maʻiʻo. E hoʻohana ʻia ka uea kuʻi me ka haʻahaʻa Si no ka hoʻoheheʻe ʻana i ke kinoea, a e hoʻohana ʻia ke ʻano titanium a me ka titanium-calcium ʻano kuʻihao no ka wili lima lima.
(2) Stomata
E oxidize ka papa zinc ma kahi kokoke i ke awāwa (ʻano ZnO) a e hoʻoheheʻe ʻia ma lalo o ka hana o ka wela arc, a hoʻokuʻu i ka uahi keʻokeʻo a me ka mahu, no laila he maʻalahi loa ka hana ʻana i nā pores i ka weld. ʻOi aku ka nui o ke au kuʻi, ʻoi aku ka koʻikoʻi o ka evaporation zinc a ʻoi aku ka nui o ka ʻike porosity. ʻAʻole maʻalahi ka hana ʻana i nā pores ma ke ʻano o kēia manawa ke hoʻohana nei i ke ʻano titanium a me ke ʻano titanium-calcium ʻano ʻulaʻula no ka wili. Eia nō naʻe, ke hoʻohana ʻia ke ʻano cellulose a me nā electrodes ʻano hydrogen haʻahaʻa no ka wili, maʻalahi nā pores e hana ma lalo o ke au haʻahaʻa a me ke kiʻekiʻe. Eia kekahi, pono e hoʻomalu ʻia ke kihi electrode i loko o 30 ° ~ 70 ° i ka hiki.
(3) ʻO ka hoʻoheheʻe Zinc a me ka uahi
Ke hoʻopili ʻia ka pā kila galvanized e ka wiliwili arc uila, ua hoʻoheheʻe ʻia ka papa zinc kokoke i ka wai i hoʻoheheʻe ʻia i ZnO a hoʻoheheʻe ʻia ma lalo o ka hana o ka wela arc, e hana ana i ka nui o ka uahi. ʻO ka mea nui o kēia ʻano uahi ʻo ZnO, he hopena hoʻoulu nui i nā ʻōpū hanu o nā limahana. No laila, pono e lawe ʻia nā ana ventilation maikaʻi i ka wā welding. Ma lalo o ka hoʻohālikelike like, ʻo ka nui o ka uahi i hana ʻia e ka wili me ka titanium oxide type electrode he haʻahaʻa, ʻoiai ka nui o ka uahi i hana ʻia e ka wili me ka haʻahaʻa hydrogen type electrode he nui. (4) Hoʻokomo ʻia ka oxide
Ke liʻiliʻi ke au kuʻi, ZnO i hoʻokumu ʻia i ke kaʻina hana hoʻomehana ʻaʻole maʻalahi e pakele, kahi maʻalahi e hoʻokomo i ka ZnO slag. Pa'a pa'a 'o ZnO a 'o kona helu hehe'e he 1800 ℃. He hopena koʻikoʻi ko ZnO inclusions ma ka weld plasticity. Ke hoʻohana ʻia ka titanium oxide electrode, maikaʻi a puʻunaue like ʻia ʻo ZnO, ʻaʻohe hopena liʻiliʻi i ka plasticity a me ka ikaika tensile. Ke hoʻohana ʻia ke ʻano cellulose a i ʻole hydrogen type electrode, ZnO i ka weld ʻoi aku ka nui a ʻoi aku, a ʻilihune ka hana weld.