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Ma keʻano he kumu ikehu maʻemaʻe, ua ulu wikiwiki ka makani makani i nā makahiki i hala iho nei. Me ka hoʻomohala ʻana i nā mea hana makani makani, ʻoi aku ka mānoanoa a me ka mānoanoa o nā pā kila i hoʻohana ʻia, a ua ʻoi aku kekahi ma mua o 100mm, e hoʻopuka ana i nā koi kiʻekiʻe no ka welding. I kēia manawa, hoʻohana nui ʻia ʻo Q355 a i ʻole DH36 i nā lako makani makani, a ʻo nā ʻano kuʻi ʻana e koho maʻamau i ka flux cored wire gas protection welding (FCAW) a me submerged arc welding (SAW).
Ma ke kaʻina hana o ka makani turbine hale kiaʻi, hiki ke hana ʻia nā māwae maikaʻi ma ka laina fusion a i ʻole ke kūlana wela i hoʻopili ʻia ma hope o ke kuʻi ʻana o ka pā puka, a ʻoi aku ka mānoanoa o ka pā kila, ʻoi aku ka nui o ka māwae. Hoʻokumu ʻia ke kumu e ka superposition piha o ke koʻikoʻi, ka wela welding, ke kaʻina welding, ka hoʻohuihui hydrogen, a me nā mea ʻē aʻe, no laila pono e hoʻoholo ʻia mai nā loulou he nui e like me ka welding material, welding sequence, welding temperature, process control, etc.
1, Ke koho ʻana i nā mea hoʻohana welding
No ka mea he mea koʻikoʻi ka ʻāpana kuʻi, pono e makemake i nā mea kuʻi me ka haʻahaʻa haumia haʻahaʻa, ka paʻakikī maikaʻi a me ke kūʻē ʻana i ka māwae maikaʻi, e like me kā mākou GFL-71Ni (GB/T10045 T494T1-1 C1 A, AWS A5.20 E71T-1C. -J).
Hana maʻamau o nā huahana GFL-71Ni:
● Haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa, P + S ≤0.012% (wt%) hiki ke hoʻomalu.
● maikaʻi elongation plasticity, elongation ma hope o break≥27%.
● ʻOi aku ka ikaika o ka hopena, -40 °C ka ikehu absorption ≥ ma mua o 100J.
● Hana maikaʻi ʻo CTOD.
● Hoʻopuehu hydrogen maʻiʻo H5 a i ʻole.
2、 Hoʻomalu kaʻina hana welding
(1) Welding preheating a me ka hoʻomalu wela ma waena
E pili ana i nā kūlana kūpono a me ka ʻike piha i hala, ua ʻōlelo ʻia e koho i ka preheating a me ka mahana waena:
● 20~38mm mānoanoa, preheating wela ma luna o 75 °C.
● 38~65mm mānoanoa, preheating wela ma luna o 100 °C.
● ʻOi aku ma mua o 65mm mānoanoa, preheating wela ma luna o 125°C.
I ka hoʻoilo, pono e noʻonoʻo ʻia ka nalowale o ka wela, no laila pono e hoʻoponopono ʻia e 30 ~ 50 ° C ma kēia kumu.
(2) Pono e hoʻomaʻamaʻa mau ʻia ka mea hana i ka wā o ke kaʻina hana kuʻi ʻana e mālama i ka mahana ma waena o ke kahawai
● 20 ~ 38mm mānoanoa, pono e hoʻomalu i ka mahana ma waena o nā kahawai 130 ~ 160 °C.
● 38 ~ 65mm mānoanoa, pono e hoʻomalu i ka mahana ma waena o nā kahawai 150 ~ 180 °C.
● ʻOi aku ma mua o 65mm mānoanoa, pono e hoʻomalu i ka mahana ma waena o nā kahawai 170 ~ 200 °C.
ʻOi aku ka maikaʻi o ka hoʻohana ʻana i nā mea ana wela e pili ana, a i ʻole kahi peni ana wela kūikawā.
3、Welding kikoo mana
| Uea uwea Anawaena | Paipai ʻia nā ʻāpana | Hoʻokomo wela |
| 1.2 mm | 220-280A/26-30V 300mm/min | 1.1-2.0KJ/mm |
| 1.4 mm | 230-300A/26-32V 300mm/min | 1.1-2.0KJ/mm |
Nānā 1: Pono e koho ʻia ka liʻiliʻi liʻiliʻi no ka hoʻopili ʻana i lalo, a ʻoi aku ka nui o ka uhi hoʻopiha, akā ʻaʻole pono e ʻoi aku ma mua o ka waiwai i manaʻo ʻia.
'Ōlelo Aʻo 2: ʻAʻole pono e ʻoi aku ka laulā o ka weld bead hoʻokahi ma mua o 20mm, a pono e hoʻonohonoho ʻia ka weld bead e like me ke kūlana maoli. Ke ākea ka ʻāwī, pono e hoʻohana ʻia ka wiliwili multi-pass, kahi mea e pono ai ka hoʻomaʻemaʻe ʻana i nā kīʻaha.
4. Welding sequence control
ʻOi aku ka maikaʻi o ka hoʻohana ʻana i ka hoʻoheheʻe symmetrical lehulehu no nā welds annular, hiki ke hōʻemi nui i ke koʻikoʻi shrinkage, a ʻoi aku ka maikaʻi o ka hoʻoheheʻe symmetrical 4-kanaka ma mua o 2-kanaka symmetrical welding.
5、Ka wehe ʻana o ka wai i ka waena o ka welding
ʻO ka wehe ʻana o ka hydrogen ma ka ʻāpana waena he ana i hana ʻia e kūʻē i ka hōʻiliʻili ʻana o ka hydrogen diffusible i ka hui ʻana o nā papa mānoanoa. Hōʻike ka noiʻi ʻike ʻia ka hopena no nā papa mānoanoa i ʻoi aku ma mua o 70mm. Penei ke kaʻina hana:
● Ho'ōki i ka wiliwili ʻana ma kahi o 2/3 o ka pahu holoʻokoʻa.
● Dehydrogenation 250-300 ℃ × 2 ~ 3h.
● E hoʻomau i ka weld a hiki i ka pau ʻana o ka wehe ʻana o ka hydrogen.
● Ma hope o ke kuʻi ʻana, uhi ʻia me ka pulupulu insulation a hoʻomaha mālie i ka lumi wela.
6. ʻO nā mea ʻē aʻe e pono e nānā
● Ma mua o ke kuʻi ʻana, pono e maʻemaʻe a maʻemaʻe nā bevels.
● Pono e pale ʻia nā ʻano koli e like me ka hiki. Manaʻo ʻia e hoʻohana i ka wili kuʻi pololei a me ka welding multi-pass multilayer.
● ʻAʻole pono ka lōʻihi o ka hoʻonui ʻana o ka uea kuʻi ʻana ma lalo o 25mm. Inā hohonu loa ka ʻauwai, e ʻoluʻolu e koho i ka nozzle conical.
● Ma hope o ka hoʻomaʻemaʻe ʻia ʻana o ka planer kalapona, pono e poni ʻia ke kala metala ma mua o ka hoʻomau ʻana i ka wili.
Loaʻa iā mākou ka helu nui o nā hiʻohiʻona noi o nā mea hoʻohana welding i hoʻohana ʻia i ka ʻoihana makani makani, hoʻokipa e nīnau!
Ka manawa hoʻouna: Nov-24-2022