Kūkākūkā ʻo Rob Koltz lāua ʻo Dave Meyer i nā hiʻohiʻona ferritic (magnetic) a me austenitic (non-magnetic) o nā mea kila kila weldable.Kiʻi kiʻi kiʻi
Nīnau: Ke hoʻopaʻa nei au i kahi pahu kila kila 316 non-magnetic.Hoʻomaka wau e wili i nā pahu wai me ka uwea ER316L a ʻike wau he magnetic nā welds.Ke hana nei au i kekahi mea hewa?
A: ʻAʻohe āu mea e hopohopo ai.He mea maʻamau no nā welds i hana ʻia me ER316L e huki i ka magnetism, a ʻo nā pepa i ʻōwili ʻia a me nā ʻāpana 316 ʻaʻole i huki pinepine i ka magnetism.
Aia nā ʻāpana hao ma nā ʻano like ʻole e pili ana i ka mahana a me ka pae doping, ʻo ia hoʻi ua hoʻonohonoho ʻia nā ʻātoma i loko o ka metala ma nā ʻano like ʻole.ʻO nā māhele maʻamau ʻelua ʻo austenite a me ferrite.ʻAʻole magnetic ka Austenite, aʻo ka ferrite ka magnetic.
I loko o ke kila kalapona maʻamau, ʻo austenite kahi ʻāpana i loaʻa wale i nā mahana kiʻekiʻe, a i ka wā e maʻalili ai ke kila, lilo ka austenite i ferrite.No laila, ma ka lumi wela, he magnetic ke kila kalapona.
ʻO kekahi mau māka o ke kila kila, me 304 a me 316, ua kapa ʻia ʻo austenitic stainless steels no ka mea ʻo ko lākou pae nui he austenite i ka lumi wela.Paʻa kēia mau kila kila i ka ferrite a huli i austenite ke hoʻomāʻalili.Hoʻopili ʻia nā ʻāpana kila kila Austenitic a me nā ʻāpana i ka hoʻomaloʻo ʻana a me nā hana ʻōwili e hoʻohuli maʻamau i nā ferrite āpau i austenite.
I 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 nā microcracks (cracking) hiki ke loaʻa i ka wā e hoʻopiha piha ʻia ka metala piha.No ka pale ʻana i nā microcracks, ʻo ka hapa nui o nā metala hoʻopiha no nā kila stainless austenitic aia ma waena o 3% a me 20% ferrite, no laila e huki lākou i nā magnet.ʻO ka ʻoiaʻiʻo, ʻo nā mea ʻike i hoʻohana ʻia e ana i ka ʻike ferrite i loko o nā welds kila kila hiki ke ana i ke kiʻekiʻe o ka huki ʻana.
Hoʻohana ʻia ʻo 316 i kekahi mau noi kahi e pono ai e hōʻemi i nā waiwai magnetic o ka weld, akā paʻakikī kēia i nā pahu.Manaʻo wau e hiki iā ʻoe ke hoʻomau i ka wili me ka pilikia ʻole.
ʻO WELDER, i kapa mua ʻia ʻo Practical Welding Today, e hōʻike ana i ka poʻe maoli e hana i nā huahana a mākou e hoʻohana ai a hana pū me kēlā me kēia lā.Ke lawelawe nei kēia nūpepa i ke kaiāulu wiliwili ma ʻAmelika ʻĀkau no nā makahiki he 20.
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