ʻO ka ʻike ʻana i nā kumu kumu e pili ana i nā electrodes stick haʻahaʻa hydrogen E7018 hiki ke kōkua i ka hoʻomaopopo ʻana pehea e hoʻonui ai i kā lākou hana, kā lākou hana a me nā wili hiki iā lākou ke hana.
ʻO ke kuʻi lāʻau ke kī nui no nā hana kuʻi he nui, ma muli o ka hoʻomau ʻana o nā mea i hoʻohana ʻia i nā noi he nui i ke kaʻina hana, a ʻo ia kekahi mea i ʻike nui ʻia e nā mea hana kuʻi. I ka wā e pili ana i ka kuʻi lāʻau, ʻo nā electrodes lāʻau E7018 a ka American Welding Society (AWS; Miami, FL) kahi koho maʻamau no ka mea hāʻawi lākou i nā waiwai mechanical a me nā kemika kūpono no nā ʻano noi like ʻole, me nā pae hydrogen haʻahaʻa e kōkua i ka pale ʻana i ka haki ʻana o ka hydrogen.
ʻO ka ʻike ʻana i nā kumu e pili ana i nā electrodes stick haʻahaʻa-hauwai E7018 hiki ke kōkua i ka hoʻomaopopo ʻana i kā lākou hana, ka hana, a me nā hopena o nā welds. Ma ke ʻano he kānāwai maʻamau, hāʻawi nā electrodes stick E7018 i nā pae spatter haʻahaʻa a me kahi arc mālie, paʻa, a mālie. Hāʻawi kēia mau ʻano metala hoʻopihapiha i ka mea hoʻokele welding i ka mana maikaʻi ma luna o ke arc a hoʻemi i ka pono no ka hoʻomaʻemaʻe ma hope o ka welding - ʻo nā mea nui ʻelua i nā noi e pono ai ka nānā pono ʻana i ka maikaʻi o ka weld a me ka hoʻokomo wela, a me nā mea ma nā lā palena paʻa.
Hāʻawi kēia mau electrodes i nā helu hoʻokaʻawale maikaʻi a me ke komo maikaʻi ʻana, ʻo ia hoʻi hiki i nā mea hoʻohana wili ke hoʻohui i nā metala wili hou aʻe i loko o ka hui i kahi manawa i hāʻawi ʻia ma mua o nā electrodes lāʻau ʻē aʻe (e like me E6010 a i ʻole E6011), a hiki nō ke pale aku i nā hemahema wili e like me ka nele o ka fusion. ʻO ka hoʻohui ʻana o nā mea e like me ka pauka hao, manganese, a me ka silicon i kēia mau electrodes e hāʻawi i nā pono kūikawā, me (akā ʻaʻole i kaupalena ʻia i) ka hiki ke wili pono ma o kekahi lepo, ʻōpala, a i ʻole ka unahi wili.
ʻO ka hoʻomaka maikaʻi ʻana a me ka hoʻomaka hou ʻana o ke arc, e kōkua ana i ka hoʻopau ʻana i nā pilikia e like me ka porosity i ka hoʻomaka ʻana o ka weld, he pono hou ia o nā electrodes stick E7018. No nā restrikes maikaʻi (e hoʻomaka hou ana i ke arc), pono e wehe mua i ka waihona silicon e hana ʻia ma ka hopena o ka electrode. Eia nō naʻe, he mea nui e hōʻoia i nā koi āpau ma mua o ka welding, ʻoiai ʻaʻole ʻae kekahi mau code a i ʻole nā kaʻina hana i ka restriking o nā electrodes stick.
E like me ka mea i ʻōlelo ʻia ma kā lākou hoʻokaʻawale ʻana o AWS, hāʻawi nā electrodes lāʻau E7018 i ka liʻiliʻi o 70,000 psi tensile strength (i koho ʻia e "70") a hiki ke hoʻohana ʻia ma nā kūlana wili āpau (i koho ʻia e "1"). ʻO ka "8" e pili ana i ka uhi haʻahaʻa-hydrogen, a me ke komo ʻana o ka electrode a me nā ʻano o kēia manawa e pono ai no ka hana. Me ka hoʻokaʻawale ʻana o AWS maʻamau, hiki i nā electrodes lāʻau E7018 ke loaʻa nā mea hoʻolālā hou e like me ka "H4" a me "H8" e pili ana i ka nui o ka hydrogen diffusible i nā waihona metala hoʻopihapiha i loko o ka weld. ʻO kahi hoʻolālā H4, no ka laʻana, e hōʻike ana he 4 ml a emi mai paha ka hydrogen diffusible i loko o ka waihona weld no 100 g o ka metala weld.
Ua hoʻāʻo ʻia nā electrodes me kahi mea hōʻailona "R" - e like me E7018 H4R - a ua manaʻo ʻia he kūpaʻa i ka makū e ka mea hana. No ka loaʻa ʻana o kēia hōʻailona, pono ka huahana e kū i ka makū i loko o kahi pae i hāʻawi ʻia ma hope o ka hōʻike ʻia ʻana i ka mahana 80 deg F a me ka haʻahaʻa pili 80 pakeneka no ʻeiwa hola.
ʻO ka mea hope loa, ʻo ka hoʻohana ʻana o "-1" ma kahi hoʻokaʻawale electrode lāʻau (e laʻa me E7018-1) ʻo ia hoʻi ka huahana e hāʻawi i ka paʻakikī o ka hopena e kōkua i ke kūʻē ʻana i ka haki ʻana i nā noi koʻikoʻi a i ʻole nā mahana haʻahaʻa.
Hiki i nā electrodes lāʻau haʻahaʻa-hauwai haʻahaʻa E7018 ke hana me kahi kumu mana o ke au mau (CC) e hāʻawi ana i ke au alternating (AC) a i ʻole ke au pololei electrode maikaʻi (DCEP). Loaʻa i nā metala hoʻopihapiha E7018 nā mea hoʻopaʻa arc hou a/a i ʻole ka pauka hao i loko o ka uhi e kōkua i ka mālama ʻana i kahi arc paʻa i ka wā e hoʻoheheʻe ai me ka hoʻohana ʻana i ke au AC. ʻO ka pōmaikaʻi nui o ka hoʻohana ʻana iā AC me nā electrodes E7018 ʻo ia ka hoʻopau ʻana i ka puhi arc, hiki ke hana i ka wā e hoʻoheheʻe ai ʻo DC me ka hoʻohana ʻana i ka grounding maikaʻi ʻole a i ʻole i ka wā e hoʻoheheʻe ai i nā ʻāpana magnetized. ʻOiai he mau mea hoʻopaʻa arc hou aʻe, ʻaʻole paha e like ka laumania o nā welds i hana ʻia me ka hoʻohana ʻana iā AC me nā mea i hana ʻia me DC, akā naʻe, ma muli o nā loli mau i ke kuhikuhi o ke au e hana ʻia a hiki i 120 mau manawa i kekona.
I ka wā e hoʻoheheʻe ai me ke au DCEP, hiki i kēia mau electrodes ke hāʻawi i ka kaohi maʻalahi o ke arc a me kahi bead weld ʻoi aku ka maikaʻi, ʻoiai ke kuhikuhi o ke kahe o ke au he mau. No nā hopena maikaʻi loa, e hahai i nā ʻōlelo a ka mea hana no nā palena hana no ke anawaena electrode.
E like me ke kaʻina hana a me ka electrode, he mea nui ke ʻano hana kūpono i ka wā e hoʻopili ai i ka lāʻau me nā electrodes lāʻau E7018 no ka hōʻoia ʻana i ka maikaʻi o ka weld. E paʻa i kahi lōʻihi arc paʻa - ʻoi aku ka maikaʻi o ka mālama ʻana i ka electrode ma luna pono o ka puddle weld - e mālama i kahi arc paʻa a hoʻemi i ka manawa kūpono no ka porosity.
I ke kuʻi ʻana ma nā kūlana pālahalaha a me nā kūlana pae, e kuhikuhi/kauo i ka electrode 5 deg a i 15 deg mai ke kuhikuhi o ka hele ʻana e kōkua i ka hōʻemi ʻana i ka manawa kūpono o ka hoʻopaʻa ʻana i ka slag i loko o ka weld. I ke kuʻi ʻana ma ke kūlana kū i luna, e kuhikuhi/pahu i ka electrode i luna 3 deg a i 5 deg i ka wā e hele ana i luna, a e hoʻohana i kahi ʻano ulana iki e kōkua i ka pale ʻana i ka weld mai ka sagging. ʻO ka laulā o ka bead weld maʻamau he ʻelua a me ka hapalua manawa o ke anawaena o ke kaula kumu o ka electrode no nā welds pālahalaha a me ka pae, a ʻelua a me ka hapa a ʻekolu manawa o ke anawaena kumu no nā welds kū i luna.
ʻO ka maʻamau, hoʻouna ʻia nā electrodes lāʻau E7018 mai ka mea hana i loko o kahi ʻeke i hoʻopaʻa pono ʻia e pale aku iā lākou mai ka hōʻino ʻana o ka makū a me ka ʻohi ʻana. He mea nui e mālama pono i kēlā ʻeke a mālama ʻia i kahi maʻemaʻe a maloʻo a hiki i ka wā e mākaukau ai nā huahana no ka hoʻohana ʻana. Ke wehe ʻia, pono e lawelawe ʻia nā electrodes lāʻau me nā mīkina lima maʻemaʻe a maloʻo e pale aku i ka lepo a me nā ʻōpala mai ka pipili ʻana i ka uhi a e hoʻopau i ka manawa kūpono no ka ʻohi ʻana i ka makū. Pono hoʻi e mālama ʻia nā electrodes i loko o ka umu ma nā mahana i ʻōlelo ʻia e ka mea hana ma hope o ka wehe ʻia ʻana.
Kuhikuhi kekahi mau code i ka lōʻihi o ka hiki ʻana o nā electrodes lāʻau ma waho o ka ʻōpala i hoʻopaʻa ʻia a i ʻole ka umu mālama a inā a i ʻole pehea ka pinepine e hiki ai ke hoʻoponopono hou ʻia ka metala hoʻopihapiha (ʻo ia hoʻi ma o ka hoʻomoʻa kūikawā e wehe i ka makū i omo ʻia) ma mua o ka hoʻolei ʻia ʻana. E nānā mau i nā kikoʻī a me nā code kūpono no nā koi o kēlā me kēia hana.
Ka manawa hoʻouna: Dec-23-2022