ʻO ka paipu kila humuhumu pololei he paipu kila me ka wili wili e like me ke kuhikuhi longitudinal o ka paipu kila. Hoʻokaʻawale maʻamau i metric uila welded kila paipu, uila welded thin-walled paipu, transformer cooling aila paipu, etc. Production kaʻina hana Straight seam kiʻekiʻe-frequency welded kila paipu i nā hiʻohiʻona o ke kaʻina hana maʻalahi a me ka wikiwiki hoʻomau hana. Hoʻohana nui ʻia lākou i ka hana kīwila, petrochemical, ʻoihana māmā, a me nā keʻena ʻē aʻe. Hoʻohana nui ʻia e lawe i ka wai haʻahaʻa haʻahaʻa a i ʻole e hana ʻia i loko o nā ʻāpana ʻenekinia a me nā huahana ʻenehana māmā.,

1. Iecaianoaaiiuo kaʻina kahe o pololei seam kiʻekiʻe alapine welded kila paipu

Hana ʻia ka paipu kila i hoʻoheheʻe ʻia ma ka ʻōwili ʻana i kahi kaula hao lōʻihi o kekahi kikoʻī i loko o ke ʻano o ka paipu poepoe ma o ka ʻāpana wili awelika kiʻekiʻe a laila wili i ke humu pololei e hana i ka paipu kila. Hiki i ke ʻano o ka paipu kila ke ʻano poepoe, ʻāpana, a i ʻole ke ʻano kūikawā, e hilinaʻi ana i ka nui a me ka ʻōwili ʻana ma hope o ke kuʻi ʻana. ʻO nā mea nui o nā paipu kila welded he haʻahaʻa carbon steel a haʻahaʻa haʻahaʻa haʻahaʻa a i ʻole nā ​​mea kila ʻē aʻe meσs≤300N/mm2, aσs≤500N/mm2.,

2. High-frequency wiliwili

Hoʻokumu ʻia ka welding kiʻekiʻe ma ke kumu o ka induction electromagnetic a me ka hopena o ka ʻili, ka hopena pili, a me ka hopena thermal eddy o kēia manawa o nā koina AC i ka conductor i hoʻomehana ʻia ke kila ma ka ʻaoʻao o ka weld i kahi moku i hoʻoheheʻe ʻia. Ma hope o ka hoʻokuʻu ʻia ʻana e ka huila, ʻo ka weld butt he inter-crystalline. Hoʻohui ʻia e hoʻokō i ke kumu o ka welding. ʻO ke kuʻekuʻe kiʻekiʻe ke ʻano o ka welding induction (a i ʻole ke kaomi hoʻopili kaomi). ʻAʻole ia e koi i nā mea hoʻopiha weld, ʻaʻohe kuʻiʻo kuʻi ʻana, loaʻa i nā ʻāpana i hoʻopili ʻia i ka wela, nā ʻano hoʻoheheʻe nani, a me nā waiwai mechanical welding maikaʻi. No laila, makemake ʻia i ka hana ʻana i nā paipu kila. Laulā o nā noi.,

Hoʻohana ka hoʻoheheʻe kiʻekiʻe o nā paipu kila i ka hopena o ka ʻili a me ka hopena pili o ke au ʻana. Ma hope o ka ʻōwili ʻia ʻana o ke kila (strip) a hana ʻia, hoʻokumu ʻia kahi pahu pōʻai me kahi ʻāpana haʻihaʻi, i hoʻohuli ʻia i loko o ka paipu kokoke i ke kikowaena o ka coil induction. A i ʻole kahi hoʻonohonoho o nā mea pale (mau koʻokoʻo magnetic). ʻO ka mea pale a me ka wehe ʻana o ka paipu blank e hana i kahi loop induction electromagnetic. Ma lalo o ka hana o ka hopena o ka ʻili a me ka hopena kokoke, ʻo ka ʻaoʻao o ka wehe ʻana o ka paipu e hoʻopuka i kahi hopena wela ikaika a paʻa, e hana ana i ka lihi o ka weld Ma hope o ka wela wikiwiki ʻana i ka mahana e pono ai no ka wili a hoʻokuʻu ʻia e kahi roller pressure, ka Loaʻa i ka metala hoʻoheheʻe ʻia ka hoʻopaʻa ʻana ma waena o nā granula a hana i kahi weld butt ikaika ma hope o ka hoʻoluʻu ʻana.

3. High-frequency welded paipu wae

Hoʻopauʻia ke kaʻina hana hoʻoheheʻe kiʻekiʻe o nā paipu kila humuhumu pololei i nā'āpana paipu kiʻekiʻe. ʻO nā ʻāpana paipu welded kiʻekiʻe ka mea maʻamau i ka hana ʻōwili, wili uila kiʻekiʻe, extrusion, hoʻoluʻu, nui, ʻoki ʻoki lele, a me nā mea ʻē aʻe. ʻO ka ʻaoʻao mua o ka pūʻulu ua hoʻolako ʻia me ka loop loop, a ʻo ka hope hope o ka ʻāpana i hoʻolako ʻia me kahi paipu kila hoʻohuli; ʻO ka ʻāpana uila ka mea nui o ka mea hoʻomohala kiʻekiʻe, DC excitation generator, a me ka mea hoʻokele aunoa.

4. Kiekie-frequency excitation kaapuni

ʻO ke kaʻapuni hoʻokiʻekiʻe kiʻekiʻe (kahi i ʻike ʻia ʻo ke kaapuni oscillation high-frequency) i haku ʻia me kahi paipu electron nui a me kahi pahu oscillation i hoʻokomo ʻia i loko o kahi mīkini hana kiʻekiʻe. Hoʻohana ia i ka hopena amplification o ka paipu electron. Ke hoʻopili ʻia ka paipu electron i ka filament a me ka anode, ua hoʻihoʻi maikaʻi ʻia ka hōʻailona hoʻopuka i ka ʻīpuka, e hana ana i kahi loop oscillation. ʻO ka nui o ke alapine excitation e pili ana i nā ʻāpana uila (voltage, current, capacitance, and inductance) o ka pahu oscillation.,

5. Pololei seam kila paipu kiʻekiʻe-frequency kuʻo kaʻina

5.1 Ka hoomalu ana i ka weld awawa

Hāʻawi ʻia ke kila kaulahao i loko o ka ʻāpana paipu welded. Ma hope o ka ʻōwili ʻia ʻana e nā wili he nui, ʻōwili mālie ʻia ke kila kāʻei e hana i kahi pahu pōʻai pōʻai me ka puka wehe. E hoʻoponopono i ka nui hoʻemi o ka huila extrusion e hoʻomalu i ke āpau weld ma waena o 1 a me 3 mm. A e hoʻokahe i nā welau ʻelua o ke awa kuʻi. Inā ʻoi aku ka nui o ka ʻāpana, e hoʻemi ʻia ka hopena pili, ʻaʻole lawa ka wela o kēia manawa, a ʻilihune ka hoʻopaʻa ʻana i waena o ka weld, e hopena i ka nele o ka hui ʻana a i ʻole ka haki ʻana. Inā liʻiliʻi loa ka ʻāpana, e piʻi ka hopena pili a ʻoi aku ka kiʻekiʻe o ka wela welding, e hoʻopau ai ka weld; a i ʻole e hana ka weld i lua hohonu ma hope o ka extruded a ʻōwili ʻia, e pili ana i ka maikaʻi o ka ʻili o ka weld.,

5.2 Hoʻomalu wela wela

Hoʻopili nui ʻia ka mahana welding e ka mana wela o kēia manawa eddy. Wahi a ke kumu (2), hiki ke ʻike ʻia ʻo ka mana wela o kēia manawa eddy e hoʻopili nui ʻia e ka alapine o kēia manawa. Hoʻohālikelike ka mana wela o kēia manawa me ka huinahā o ka alapine hoʻoulu o kēia manawa, a ʻo ke alapine o ka hoʻoulu ʻana i kēia manawa ke hoʻopili ʻia e ka alapine hoʻoulu. Nā hopena o ka volta, ka manawa, ka capacitance, a me ka inductance. ʻO ke kumu hoʻohālikelike alapinepine hoʻoulu ʻia ʻo f=1/[2π(CL)1/2]…(1) Kahi: f-excitation frequency (Hz); C-capacitance (F) i loko o ka excitation loop, capacitance = mana / Voltage; L-inductance i loko o ka excitation loop, inductance = magnetic flux / manawa. Hiki ke ʻike ʻia mai ka ʻōlelo ma luna aʻe nei ka hoʻohālikelike ʻana o ke alapine excitation i ke kumu huinahā o ka capacitance a me ka inductance i loko o ka puka hoʻohiwahiwa, a i ʻole ke kūlike pololei i ke kumu huinahā o ka volta a me kēia manawa. I ka lōʻihi o ka hoʻololi ʻana o ka capacitance a me ka inductance i ka loop, hiki i ka volta inductive a i ʻole ke hoʻololi i ke alapine excitation, a laila e hoʻokō ai i ke kumu o ka mālama ʻana i ka wela welding. No ke kila kalapona haʻahaʻa, mālama ʻia ka mahana welding ma 1250 ~ 1460℃, ka mea hiki ke hoʻokō i ka kuʻihao koi koi o 3 ~ 5mm paipu paia mānoanoa. Eia kekahi, hiki ke hoʻokō ʻia ka mahana welding ma ka hoʻoponopono ʻana i ka wikiwiki welding. Ke lawa ʻole ka wela hoʻokomo, ʻaʻole hiki i ke kihi weld wela ke hiki i ka wela wili, a paʻa mau ke ʻano metala, e hopena i ka hui ʻole ʻana a i ʻole ka hoʻopili piha ʻana; inā lawa ʻole ka wela hoʻokomo, ʻoi aku ka wela o ka weld wela ma mua o ka wela hoʻoheheʻe ʻana, ʻo ia ka hopena o ka over-burning a i ʻole ka hoʻoheheʻe ʻia e hoʻoheheʻe ʻia ka weld i puka i hoʻoheheʻe ʻia.,

5.3 Mana o ka extrusion ikaika

Ma hope o ka wela ʻana o nā ʻaoʻao ʻelua o ka paipu i ka wela welding, e ʻoki ʻia lākou e ka roller squeeze e hana i nā hua metala maʻamau e komo a crystallize me kekahi i kekahi, a laila e hana i kahi weld ikaika. Inā liʻiliʻi ka ikaika extrusion, liʻiliʻi ka helu o nā kristal maʻamau i hana ʻia, e emi ana ka ikaika o ka weld metala, a hiki mai ka pohā ma hope o ke kaumaha; inā ʻoi aku ka nui o ka ikaika extrusion, e ʻoki ʻia ka metala i hoʻoheheʻe ʻia mai ka weld, ʻaʻole ia e hōʻemi wale ʻia. wiliwili ʻana i nā ʻūhā.,

5.4 Mana o ke kūlana kiʻekiʻe-frequency induction coil

ʻO ke kiʻekiʻe-frequency induction coil e pili kokoke i ke kūlana o ka wili wili. Inā mamao loa ka induction coil mai ka extrusion roller, ʻoi aku ka lōʻihi o ka manawa hoʻomehana maikaʻi, ʻoi aku ka nui o ka wahi i hoʻopili ʻia i ka wela, a emi ka ikaika o ka weld; akā, ʻaʻole e wela ka lihi o ka weld a ʻilihune ke ʻano ma hope o ka extrusion.,

5.5 ʻO ka resistor hoʻokahi a i ʻole pūʻulu o nā koʻokoʻo magnetic kūikawā no nā paipu welded. ʻAʻole pono e emi iho ka ʻāpana keʻa o ka resistor ma mua o 70% o ka ʻāpana keʻa o ke anawaena o loko o ka paipu kila. ʻO kāna hana, ʻo ia ke hana i kahi loop induction electromagnetic me ka coil induction, ka lihi o ka paipu blank weld seam, a me ke koʻokoʻo magnetic. , e hana ana i kahi hopena pili, ua hoʻomālama ʻia ka wela o kēia manawa ma kahi kokoke i ka lihi o ka weld blank tube, e hoʻomehana ʻia ka lihi o ka pahu i ka wela wili. Kauo ʻia ka resistor i loko o ka pahu blank me kahi uea kila, a ʻo kona kūlana waena pono e hoʻopaʻa paʻa kokoke i ke kikowaena o ka extrusion roller. Ke hoʻohuli ʻia ka mīkini, ma muli o ka neʻe wikiwiki ʻana o ka paipu blank, loaʻa i ka resistor kahi poho nui mai ka friction o ka paia o loko o ka pahu blank a pono e hoʻololi pinepine ʻia.,

5.6 Ma hope o ka wili a me ka extrusion, e hana ʻia nā ʻōpala weld a pono e wehe ʻia. ʻO ke ʻano hoʻomaʻemaʻe ʻo ia ka hoʻoponopono ʻana i ka mea hana ma ke kiʻi a hilinaʻi i ka neʻe wikiwiki o ka paipu welded e hoʻomaʻamaʻa i ka weld scar. ʻAʻole wehe ʻia nā ʻōpala i loko o nā paipu welded.,

6. Nā koi ʻenehana a me ka nānā ʻana i ka maikaʻi o nā paipu welded kiʻekiʻe

Wahi a ka GB3092 "Welded Steel Pipe for Low-Pressure Fluid Transport" maʻamau, ʻo ke anawaena nominal o ka paipu welded he 6 ~ 150mm, ʻo 2.0 ~ 6.0mm ka mānoanoa o ka pā, ʻo ka lōʻihi o ka paipu welded maʻamau 4 ~ 10 mika a hiki ke kuhikuhi ʻia i ka lōʻihi paʻa a i ʻole ka lōʻihi lōʻihi Factory. Pono ka maikaʻi o ka ili o nā paipu kila, a ʻaʻole ʻae ʻia nā hemahema e like me ka pelu ʻana, nā māwae, delamination, a me ka wili ʻana. ʻAe ʻia ka ʻili o ka paipu kila e loaʻa nā hemahema liʻiliʻi e like me nā ʻōpala, nā ʻōpala, nā weld dislocations, nā kuni, a me nā ʻōpala ʻaʻole i ʻoi aku ma mua o ka neʻe maikaʻi ʻole o ka mānoanoa o ka pā. ʻAe ʻia ka mānoanoa o ka mānoanoa o ka pā ma ka weld a me ka hiki ʻana o nā kaola weld kūloko. Pono nā paipu kila welded i nā ho'āʻo hana mechanical, nā ho'āʻo pālahalaha, a me nā ho'āʻo hoʻonui, a pono e hoʻokō i nā koi i kuhikuhi ʻia ma ka maʻamau. Hiki i ka paipu kila ke kū i kekahi kaomi kūloko. Inā pono, pono e hana ʻia kahi hoʻāʻo kaomi 2.5Mpa e mālama ʻole i ka leakage no hoʻokahi minuke. Ua ʻae ʻia ka hoʻohana ʻana i ke ala ʻike flaw eddy i kēia manawa ma kahi o ka hoʻāʻo hydrostatic. Lawe ʻia ʻo Eddy flaw detection e ka GB7735 maʻamau "Eddy Current Flaw Detection Inspection Method for Steel Pipes". ʻO ke ʻano o ka eddy flaw detection method o ka hoʻoponopono ʻana i ka probe ma ke kiʻi, mālama i kahi mamao o 3 ~ 5mm ma waena o ka ʻike kīnā a me ka weld, a hilinaʻi i ka neʻe wikiwiki o ka paipu kila e hana i kahi scan piha o ka weld. Hoʻomaʻamaʻa ʻia ka hōʻailona ʻike hemahema a hoʻokaʻawale ʻia e ka eddy flaw detector. No ka hoʻokō ʻana i ke kumu o ka ʻike hemahema. He paipu kila i hana ʻia me nā pā kila a i ʻole nā ​​ʻāpana kila i ʻōwili ʻia a wili ʻia. He maʻalahi ke kaʻina hana o nā paipu kila welded, ʻoi aku ka maikaʻi o ka hana ʻana, he nui nā ʻano a me nā kikoʻī, a he liʻiliʻi ka hoʻokomo ʻana i nā mea hana, akā ʻoi aku ka haʻahaʻa o ka ikaika ma mua o nā paipu kila seamless. Mai ka 1930s, me ka hoʻomohala wikiwiki ʻana o ka hana ʻana i ka ʻōwili mau ʻana o ke kila kila kiʻekiʻe a me ka holomua o ka welding a me ka ʻenehana nānā, ua hoʻomau ka maikaʻi o nā welds, a ua hoʻonui ʻia nā ʻano a me nā kikoʻī o nā paipu kila welded i kēlā me kēia lā , hoʻololi i nā paipu kila i hoʻopau ʻole ʻia i nā māla hou aʻe. Paipu kila humuhumu. Hoʻokaʻawale ʻia nā paipu kila welded i nā paipu wili wili pololei a me nā paipu spiral welded e like me ke ʻano o ka weld. He maʻalahi ke kaʻina hana o ka paipu wili wili pololei, ʻoi aku ka maikaʻi o ka hana, haʻahaʻa ke kumukūʻai, a wikiwiki ka hoʻomohala ʻana. ʻOi aku ka ʻoi aku o ka ikaika o nā paipu wiliwili spiral ma mua o nā paipu wili wili pololei. Hiki ke hana ʻia nā paipu welded me nā anawaena ʻoi aʻe mai nā billet ʻoi aku ka liʻiliʻi, a ʻo nā paipu welded me nā anawaena like ʻole hiki ke hana ʻia mai nā billet o ka laulā like. Eia naʻe, ke hoʻohālikelike ʻia me nā paipu seam pololei o ka lōʻihi like, hoʻonui ʻia ka lōʻihi weld e 30 ~ 100%, a ʻoi aku ka haʻahaʻa o ka wikiwiki. Ma hope o ka ʻike ʻia ʻana o ka hewa, ʻoki ʻia ka paipu welded i ka lōʻihi i ʻōlelo ʻia me kahi ʻike lele a ʻōwili ʻia mai ka laina hana ma o ke kiʻi flip. Pono e hoʻopaʻa ʻia nā ʻaoʻao ʻelua o ka paipu kila, a hoʻopaʻa ʻia nā paipu i hoʻopau ʻia i loko o nā pūpū hexagonal ma mua o ka haʻalele ʻana i ka hale hana.