Ua kūkākūkā ʻo Rob Koltz lāua ʻo Dave Meyer i nā ʻano ferritic (magnetic) a me austenitic (non-magnetic) o nā kila kila hiki ke hoʻopili ʻia. Getty Images
Q: Ke kuʻihao nei au i kahi pahu kila kila 316 ʻaʻole magnetic. Ua hoʻomaka wau e kuʻihao i nā pahu wai me ka uea ER316L a ʻike wau he magnetic nā kuʻihao. Ke hana hewa nei au?
A: ʻAʻohe ou mea e hopohopo ai. He mea maʻamau no nā wili i hana ʻia me ER316L ke huki i ka magnetism, a ʻo nā pepa i ʻōwili ʻia a me nā pepa 316 ʻaʻole pinepine lākou e huki i ka magnetism.
Aia nā mea hao i nā pae like ʻole ma muli o 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 pae ʻelua maʻamau ka austenite a me ka ferrite. ʻAʻole magnetic ka Austenite, ʻoiai he magnetic ka ferrite.
I ke kila kalapona maʻamau, he ʻano austenite e kū wale ana ma nā mahana kiʻekiʻe, a i ka wā e hoʻomaʻalili ai ke kila, lilo ka austenite i ferrite. No laila, i ka mahana o ka lumi, he magnetic ke kila kalapona.
ʻO kekahi mau papa o ke kila kila, me 304 a me 316, ua kapa ʻia he mau kila kila austenitic no ka mea ʻo ko lākou ʻano nui he austenite i ka mahana o ka lumi. Paʻakikī kēia mau kila kila i ferrite a huli i austenite ke hoʻomaʻalili ʻia. Hoʻopilikia ʻia nā papa a me nā pepa kila kila Austenitic i nā hana hoʻomaʻalili a me ka ʻōwili ʻana e hoʻololi pinepine ana i nā ferrite āpau i austenite.
I ka waena o ke kenekulia 20, ua ʻike ʻia i ka wā e hoʻoheheʻe ai i nā kila kila austenitic, ʻo ke alo o kekahi ferrite i loko o ka metala weld e pale aku i nā microcracks (cracking) hiki ke hana i ka wā e austenitic loa ai ka metala hoʻopihapiha. No ka pale ʻana i nā microcracks, ʻo ka hapa nui o nā metala hoʻopihapiha no nā kila kila austenitic e loaʻa ana ma waena o 3% a me 20% ferrite, no laila huki lākou i nā magnet. ʻO ka ʻoiaʻiʻo, hiki i nā sensor i hoʻohana ʻia e ana i ka nui o ka ferrite o nā welds kila kila ke ana i ka pae o ka huki magnetic.
Hoʻohana ʻia ʻo 316 i kekahi mau noi kahi e pono ai e hōʻemi i nā waiwai magnetic o ka weld, akā ʻaʻole pono pinepine kēia i loko o nā pahu. Manaʻolana wau hiki iā ʻoe ke hoʻomau i ke kūʻai ʻana me ka ʻole o nā pilikia.
ʻO WELDER, i kapa ʻia ma mua ʻo Practical Welding Today, ke hōʻike nei i nā poʻe maoli e hana ana i nā huahana a mākou e hoʻohana ai a hana pū me kēlā me kēia lā. Ua lawelawe kēia makasina i ke kaiāulu welding ma ʻAmelika ʻĀkau no nā makahiki he 20 a ʻoi.
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E kiʻi i ke komo kikohoʻe piha i ka STAMPING Journal, e hōʻike ana i ka ʻenehana hou loa, nā hana maikaʻi loa a me nā nūhou ʻoihana no ka mākeke sila metala.
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