ʻO ka pilina ma waena o ka wikiwiki welding a me ka maikaʻi weld

Pono e hoʻomaopopo ʻia ka pilina ma waena o ka wikiwiki welding a me ka maikaʻi weld a ʻaʻole mālama ʻia. Hōʻike nui ʻia i ka pae hoʻomehana a me ka pae crystallization.

Ke kahua hoʻomehana: Ma lalo o ke kūlana o ke kiʻekiʻe-frequency straight seam welded pipe, ka lihi o ka paipu blank ua wela mai ka lumi wela a hiki i ka wela wili. I loko o kēia manawa, ʻaʻole pale ʻia ka lihi o ka paipu blank a hōʻike ʻia i ka lewa, ka mea inevitably reactly violently me ka oxygen, nitrogen, etc. E like me nā ana, hoʻonui ʻia ka nui o ka nitrogen i loko o ka weld seam e 20-45 mau manawa, a piʻi ka ʻike oxygen e 7-35 mau manawa; I ka manawa like, ua puhi nui ʻia nā mea hoʻohuihui e like me ka manganese a me ke kalapona e pono ai ka weld seam a hoʻoheheʻe ʻia, e hopena i ka emi ʻana o nā waiwai mechanical o ka weld seam. Mai kēia, hiki ke ʻike ʻia ma kēia ʻano, ʻoi aku ka lohi o ka wikiwiki o ka welding, ʻoi aku ka maikaʻi o ka weld seam. Eia kekahi, ʻoi aku ka lōʻihi o ka lihi o ka billet wela i ka lewa, ʻoi aku ka lohi o ka wikiwiki o ka welding, hiki ke hoʻokumu ʻia nā oxides non-metallic i nā papa hohonu. He mea paʻakikī kēia mau mea hoʻoheheʻe ʻole metala i loko o ka weld seam i ka wā o ka extrusion crystallization kaʻina hana, a noho i loko o ka weld seam i ke ʻano o ka non-metallic inclusions ma hope o ka crystallization. ka hoʻomauʻana o ka hana weld seam a ho'ēmi i ka ikaika o ka weld seam. A wikiwiki ka wikiwiki o ka welding, pōkole ka manawa oxidation, a ʻo nā oxides non-metallic i hana ʻia he liʻiliʻi a kaupalena ʻia i ka papa honua. He mea maʻalahi ke kaomi ʻana i waho o ka weld seam i ka wā o ka extrusion kaʻina hana, a ʻaʻole e nui loa ke koena non-metallic oxide i loko o ka weld seam, e hopena i ka ikaika weld kiʻekiʻe.

Crystallization pae: E like me nā loina o ka metallurgy, i mea e loaʻa ai nā welds ikaika kiʻekiʻe, pono e hoʻomaʻemaʻe i ka hana palaoa o ka weld e like me ka hiki; ʻO ke ala maʻamau i ka hoʻomaʻemaʻe ʻana, ʻo ia ka hana ʻana i nā nuclei aniani i loko o kahi manawa pōkole, i hui pū kekahi me kekahi ma mua o ka ulu nui ʻana a hoʻopau i ke kaʻina hana crystallization. Pono kēia e hoʻonui i ka wikiwiki o ka welding e wehe koke i ka weld mai ka wahi wela, i mea e hiki ai i ka weld ke crystallize wikiwiki i kahi kiʻekiʻe o ka undercooling; Ke piʻi ka degere o ka undercooling, hiki ke hoʻonui nui ʻia ka nui o ka nucleation, ʻoiai ka piʻi nui ʻana o ka ulu ʻana, pēlā e hoʻokō ai i ka pahuhopu o ka hoʻomaʻemaʻe ʻana i ka nui o ka weld seam. No laila, inā i nānā ʻia mai ka pae wela o ke kaʻina hana kuʻi ʻana a i ʻole ka hoʻoluʻu ʻana ma hope o ke kuʻi ʻana, ʻoi aku ka wikiwiki o ka weldin.g ka wikiwiki, ʻoi aku ka maikaʻi o ka weld seam, inā e hoʻokō ʻia nā kūlana wili kumu.