Pehea e wili ai i ke keleawe me ka pā titanium?

ʻO ke ʻano lattice, wahi hoʻoheheʻe, conductivity thermal, coefficient o ka hoʻonui laina a me ka hoʻohui kemika o ke keleawe a me nā papa titanium ʻokoʻa loa, no laila, nui nā pilikia i ka welding.

1, maʻalahi ka weld e hana i nā pores

(1) keleawe a me ka titanium kiʻekiʻe wela hydrogen absorption mea ikaika loa, hydrogen i loko o ka wai moku o ke keleawe a me ka titanium i ka nui solubility.

(2) ka hopena metallurgical kiʻekiʻe i loko o ka wai hoʻoheheʻe o ke kinoea.

(3) Oxygen a me naeaea kinoea puni ka wili wahi i loko o ka hooheheeia loko. Molten pool crystallization kaʻina, ke kinoea hiki ole a pau i pakele i ka ili o ka punawai hooheheeia, koe i loko o ka weld e hana pores.

2, welded ami māwae māwae

ʻO ke keleawe a me ka titanium wili, ma ka ʻaoʻao metala makua ʻelua o ka metala hiki ke hana i kahi aniani maʻamau a me ka hydride, maʻalahi e hana i nā māwae ma lalo o ka hana o ke koʻikoʻi wili.

(1) ʻO ke keleawe a me ka bismuth kahi eutectic wahi o 270 ℃ (Cu + Bi) eutectic.

(2) keleawe a me ka alumini e hana i kahi eutectic o 326 ℃ (Cu + Pb) eutectic.

(3) Hana ʻia ke keleawe a me ka ferrous sulfide i co-crystal o (Cu+Cu2O) me kahi kiko eutectic o 1067 ℃.

(4) Ka hoʻokumu ʻana o ka flaky hydride TiH2 ma ka ʻaoʻao metala o ka mea kumu titanium, e hopena i ka hoʻoheheʻe ʻana o ka hydrogen.

(5) keleawe a me ka laina titanium hoʻonui coefficient ʻokoʻa ʻoi aku ma mua o 1 mau manawa, ʻoi aku ka nui o ke kaumaha.

3, haʻahaʻa mechanical waiwai o welded ami

(1) hiki ke hoʻonāwaliwali i ke kiʻi oxide i ka hui intergranular o ke keleawe a me ka titanium, e like me nā welds i loaʻa ka oxygen a hiki i ka 0.38%, ke kihi kulou hui mai 180 ° a hiki i 120 °.

(2) ʻO ka nui o nā co-crystals a me nā hydride e hoʻemi nui i ka plasticity a me ka paʻakikī o nā hui welded.

(3) He liʻiliʻi loa ka solubility o ke keleawe a me ka titanium, a ua maʻalahi ke hana i nā pūhui intermetallic i nā wela kiʻekiʻe. E like me Ti2Cu, TiCu, Ti3Cu4, Ti2Cu3, TiCu2, TiCu4, hoʻonui i ka brittleness, hoʻemi i ka plasticity, a hoʻemi nui i ka weld metala corrosion.

ʻO ke keleawe a me ka titanium a i ʻole ka titanium alloy e hoʻohana ana i ka welding diffusion vacuum, argon arc welding, plasma arc welding, brazing a me electron beam welding hiki ke loaʻa nā hui welded maikaʻi loa.

No ka laʻana: ka hoʻohana ʻana i ka welding diffusion vacuum, ʻike ʻia ka welding diffusion e nā hui ʻaʻole oxidize, weld helehelena, maikaʻi o ka huahana. ʻO ke kaʻina hana nui, ʻo ia ka: kuʻi ʻana i ka metala kumu keleawe (e like me T2) me ka hoʻomaʻemaʻe trichlorethylene, wehe i ka ʻaila a me nā ʻōpala ʻē aʻe. A laila ma ka 10% sulfuric acid solution etching 1min, a laila holoi me ka wai i hoʻoheheʻe ʻia, a laila hoʻomaʻamaʻa annealing, annealing wela o 820 ~ 830 ℃, annealing manawa o 10min.

Ma hope o ka hoʻomaʻemaʻe ʻia ʻana o ka metala kumu titanium (TA2) me ka trichloroethylene, ua kālai ʻia i loko o kahi wai wai o HF me ka hapa nui o 2% a me HNO3 me ka hapa nui o 50% e ka haʻalulu no 4min e wehe i ke kiʻi oxide, a laila. hoʻomaʻemaʻe me ka wai a me ka waiʻona.

(4) Hoʻohui ʻia nā ʻano metala kumu ʻelua i hoʻomaʻemaʻe ʻia e like me nā koi o ke kaʻina hana, a laila hoʻokomo ʻia i loko o ka umu ahi no ka wili. ʻO nā ʻāpana kuʻi: ka wela welding o 810 ℃ ± 10 ℃, kaomi o 5 ~ 10MPa, manawa o 10min, vacuum degere o 1.3332 × 10-8 ~ 1.3332 × 10-9MPa. ma waena o nā metala kumu ʻelua hiki ke hoʻohui ʻia i ka waena o ka papa diffusion, maʻamau ke koho ʻana o ka diffusion layer material o ka metala niobium, a i ʻole e hoʻohui i ka waena o ka papa diffusion. Ma hope o ke kuʻi ʻana, pono e hoʻomaʻemaʻe pono ka ʻili hui.

E like me ka hoʻohana ʻana o ka argon arc welding copper a me ka titanium, hiki i ka hoʻohana ʻana i ka cerium tungsten electrode ke hoʻomaikaʻi i ka maikaʻi o ka welding a pono i ke olakino kanaka. E like me ka welding copper alloy (QCr0.5) a me ka titanium alloy (TC2), hiki ke hoʻohana ʻia ka niobium ma ke ʻano he papa hoʻololi, hiki ke loaʻa ka maʻemaʻe argon o 99.8% no nā hui kiʻekiʻe.