Kūkākūkā ʻo Rob Koltz lāua ʻo Dave Meyer i nā hiʻohiʻona ferritic (magnetic) a me austenitic (non-magnetic) o nā mea kila kila welded.Getty Images
Nīnau: Ke hoʻopaʻa nei au i kahi pahu i hanaʻia me ka 316 stainless steel,ʻaʻole ia he magnetic. Ua hoʻomaka wau e hoʻopaʻa i nā pahu wai me ER316L uea aʻikeʻia he magnetic nā welds. Ke hana nei au i kekahi mea hewa?
A: ʻAʻohe āu mea e hopohopo ai. He mea maʻamau ia no nā welds i hana ʻia me ER316L e huki i ka magnetism, a he mea maʻamau no ka ʻōwili ʻia ʻana o nā ʻāpana a me nā ʻāpana ʻaʻole e huki i ka magnetism.
Loaʻa nā mea hao hao ma nā ʻano like ʻole e pili ana i ka mahana a me ke kiʻekiʻe o ka alloying, ʻo ia hoʻi he ʻokoʻa ka hoʻonohonoho ʻana o nā ʻātoma i loko o ka metala.
I loko o ke kila kalapona maʻamau, ʻo austenite kahi māhele e noho wale ana ma nā mahana kiʻekiʻe, a i ka wā e maʻalili ai ke kila, hoʻololi ʻo austenite i ferrite.
Ua kapa ʻia kekahi mau māka o ke kila kuhili ʻole, me 304 a me 316, ʻo austenitic stainless steels no ka mea he austenite ko lākou pae nui i ka lumi wela. Hoʻoikaika kēia mau kila kulika i ka ferrite a hoʻololi i ka austenite i ka wā i hoʻomoʻa ʻia.
Ma ka waena o ke kenekulia 20, ua ʻike ʻia i ka wā e kuʻi ai i nā kila kuhili ʻole austenitic, ʻo ka hiki ʻana o kekahi ferrite i loko o ka weld metala e pale ai i ka microcracking (cracking) hiki ke hana i ka wā o ka hoʻopiha piha ʻana i ka austenitic. e ana no hoi i ke kiekie o ka hoohihia ana.
Loaʻa iā 316 kekahi mau noi kahi e hōʻemi ai i nā waiwai magnetic o ka weld he mea koʻikoʻi, akā ʻaʻole pono kēia i nā pahu.
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