ʻO ka mālama ʻana i ka dehydrogenation, ʻike ʻia hoʻi ʻo ka dehydrogenation heat treatment, a i ʻole ka mālama wela post-weld.
ʻO ke kumu o ka mālama ʻana i ka wela ma hope o ka weld ma hope koke o ke kuʻi ʻana e hoʻemi i ka paʻakikī o ka weld zone, a i ʻole e wehe i nā mea ʻino e like me ka hydrogen i loko o ka weld zone. Ma kēia mea, ʻo ka mālama ʻana ma hope o ka wela a me ka mālama ʻana i ka wela ma hope o ka weld i ka hopena ʻāpana like.
Ma hope o ke kuʻi ʻana, hoʻemi ka wela i ka pae hoʻoluʻu o ka weld seam a me ka hui welded e paipai i ka pakele o ka hydrogen a pale i ka piʻi ʻana o ka paʻakikī.
(1) Ma hope o ka hoʻomehana ʻana no ka hoʻomaikaʻi ʻana i ka hana o ka hui welded a me ka hoʻohaʻahaʻa ʻana i kona paʻakikī hiki ke hoʻohana wale ʻia i ka wā e mau ana ka welding zone i kahi wela kiʻekiʻe ma hope o ka wili.
(2) Ma hope o ka wela e pale ai i nā māwae haʻahaʻa haʻahaʻa, ʻo ia ka mea e hāpai i ka lawe ʻana i ka ikehu hydrogen i loko o ka wahi kuʻi.
ʻO ka wehe ʻana o ka hydrogen e pili ana i ka mahana a me ka manawa paʻa ma hope o ka wela. ʻO ka mahana no ke kumu nui o ka hoʻopau ʻana i ka hydrogen ma ke ʻano he 200-300 degere, a ʻo ka manawa ma hope o ka hoʻomehana ʻana he 0.5-1 hola.
No nā welds i kēia mau kūlana, pono e hoʻokō koke ʻia ka mālama ʻana i ka hydrogen elimination post-thermal ma hope o ke kuʻi ʻana (4 mau helu):
(1) ʻOi aku ka mānoanoa ma mua o 32mm, a me ka ikaika tensile maʻamau σb>540MPa;
(2) Haʻahaʻa-alloy mea kila me ka mānoanoa nui ma mua o 38mm;
(3) ʻO ka weld butt ma waena o ka nozzle i hoʻokomo ʻia a me ka ipu kaomi;
(4) Hoʻoholo ka loiloi kaʻina hana welding e koi ʻia ka mālama ʻana i ka hydrogen elimination.
Hōʻike pinepine ʻia ka waiwai o ka wela ma hope o ka wela ma ke ʻano penei:
Tp＝455.5[Ceq]p－111.4
Ma ke kumu, Tp——ma hope o ka wela ℃;
[Ceq]p——Kapahu like like.
[Ceq]p=C+0.2033Mn+0.0473Cr+0.1228Mo+0.0292Ni+0.0359Cu+0.0792Si－1.595P+1.692S+0.844V
ʻO ka hoʻemi ʻana i ka ʻike hydrogen i loko o ka weld zone kekahi o nā hopena koʻikoʻi o ka mālama ʻana i ka wela. Wahi a nā hōʻike, ma 298K, ʻo ke kaʻina o ka hoʻoheheʻe hydrogen mai nā welds kila kalapona haʻahaʻa he 1.5 a 2 mau mahina.
Ke hoʻonui ʻia ka mahana i 320K, hiki ke hoʻopōkole ʻia kēia kaʻina hana i 2 a 3 mau lā a me nā pō, a ma hope o ka hoʻomehana ʻana i 470K, lawe ia i 10 a 15 mau hola.
ʻO ka hana nui o ka mālama ʻana ma hope o ka wela a me ka dehydrogenation ʻo ia ka pale ʻana i ka hana ʻana o nā māwae anu i loko o ka weld metala a i ʻole i ka wahi wela.
ʻAʻole lawa ka preheating o ka weldment ma mua o ke kuʻi ʻana e pale i ka hoʻokumu ʻia ʻana o nā māwae anu, e like me ke kuʻi ʻana o nā hui hoʻopaʻa kiʻekiʻe a me nā kila paʻakikī, pono e hoʻohana ʻia ke kaʻina hana post-heating e pale pono i ka hoʻokumu ʻana. nā māwae anu.
Ka manawa hoʻouna: Mar-29-2023
