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本文研究了用CO_2气体保护焊接1X18H9T不锈钢焊缝和焊接接头的性能和金属过渡,并同氩弧焊,焊剂层下自动焊,手工电弧焊和气焊进行了比较。 CO_2气体保护焊焊接1X18H9T时,焊缝中的C,Cr,Ni同原始成分比较没有很大变化,唯有Ti氧化的较多。用CO_2气体保护焊接的焊接接头,其破坏极限和屈服极限不仅不比其他焊接方法焊接的低,而且比基本金属高,但塑性较低。用这种方法焊接的焊缝的破坏极限也很高。焊缝的抗腐蚀性能试验证明:用GB—1X18H9T焊丝在CO_2保护气体中焊接的试件经650℃保温2小时退火处理后,在H_2SO_4+CuSO_4水溶液中煮沸48小时,或在HNO_(?)+NaF木溶液中煮沸1小时,均未发现晶间腐蚀。除氩弧焊焊接的试件外,用其他焊接方法焊接的试件经6.0℃保温2小时退火处理,在HNO_3a+NaF水溶液中煮沸1小时都发生晶间腐蚀。 在保护气体中焊接时的金属过渡,不同于焊剂层下自动焊和手工电弧焊。在保护气体中焊按时,过程的特点是发生多次短路。其特性同焊接电流,电弧电压及焊丝直径有关。 为了进一步保证抗腐蚀性,所借合理选举焊丝,加合金元素和双层气体保护解决。
In this paper, the performance and metal transition of 1X18H9T stainless steel weld and welded joints protected by CO_2 gas are studied and compared with TIG welding, automatic flux layer welding, manual arc welding and gas welding. CO_2 gas shielded welding 1X18H9T welding, the weld in the C, Cr, Ni compared with the original composition did not change much, only more Ti oxidation. Not only is the failure limit and yield limit of welded joints protected by CO2 gas welding not lower than that of other welding methods, but also higher than that of base metals, but the plasticity is low. The welding seam welded in this way has a very high failure limit. The corrosion resistance test of the weld proves that the specimen welded by GB-1X18H9T welding wire in CO2 shielding gas is annealed at 650 ℃ for 2 hours and then boiled for 48 hours in H_2SO_4 + CuSO_4 aqueous solution or in HNO_ (?) + NaF wood solution boiled for 1 hour, no intergranular corrosion was found. In addition to argon arc welding test specimens, welding with other welding method specimens after annealing at 6.0 ℃ for 2 hours annealed in HNO_3a + NaF aqueous solution for 1 hour have occurred between the intergranular corrosion. The metal transition during welding in a shielding gas is different from automatic and manual arc welding under solder layers. In the protection of gas welding time, the process is characterized by multiple shorts. Its characteristics with the welding current, arc voltage and diameter of the wire. In order to further ensure the corrosion resistance, by reasonable selection of welding wire, plus alloying elements and double gas protection solution.