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张佳, 邵沛泽, 王新鑫, 黄健康, 樊丁. 双TIG活性电弧增材制造方法与工艺[J]. 焊接学报. DOI: 10.12073/j.hjxb.20230730002
引用本文: 张佳, 邵沛泽, 王新鑫, 黄健康, 樊丁. 双TIG活性电弧增材制造方法与工艺[J]. 焊接学报. DOI: 10.12073/j.hjxb.20230730002
ZHANG Jia, SHAO Peize, WANG Xinxin, HUANG Jiankang, FAN Ding. Method and technology of two TIG activating arc additive manufacturing[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION. DOI: 10.12073/j.hjxb.20230730002
Citation: ZHANG Jia, SHAO Peize, WANG Xinxin, HUANG Jiankang, FAN Ding. Method and technology of two TIG activating arc additive manufacturing[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION. DOI: 10.12073/j.hjxb.20230730002

双TIG活性电弧增材制造方法与工艺

Method and technology of two TIG activating arc additive manufacturing

  • 摘要: 为了进一步发挥电弧-丝材增材制造方法高熔敷效率的优势,提出了一种采用双TIG活性电弧作为热源的增材制造方法,利用双TIG电弧并在保护气体中加入少量活性气体氧气,采用直径1.2 mm的SUS304奥氏体不锈钢焊丝进行薄壁件堆积试验,研究了氧的引入、沉积电流分配、电弧移动速度和送丝速度等工艺参数对熔敷层平均宽度和高度的影响,并考察熔敷金属的显微组织和力学性能. 结果表明,与普通TIG电弧相比,双TIG活性电弧增材制造工艺不仅能够改善焊缝成形并提高熔敷效率,而且降低熔敷金属和熔池的表面张力,增强其润湿铺展特性,进一步改善沉积层成形;在电流相当的条件下,与普通TIG电弧沉积相比,沉积效率明显提高,达到2.7 kg/h. 随着后置焊枪沉积电流的增大(前置焊枪沉积电流的减小),墙体宽度先增加后减小,墙体高度的变化与之相反;随着电弧移动速度增加,墙体宽度和高度均下降;当送丝速度增加时,墙体高度明显增加,宽度变化不大. 氧气对墙体熔敷金属微观组织无明显影响,组织形态均为垂直于沉积方向的柱状树枝晶. 沉积墙体的抗拉强度和断后伸长率随着氧气的引入略有下降.

     

    Abstract: To further enhance the high deposition efficiency advantage of wire and arc additive manufacturing, a new technology and method using a two TIG activating arc as the heat source was proposed. By introducing a small amount of activating gas O2 into the argon shielding gas, a thin-wall deposition experiment were conducted and fabricated using 1.2 mm diameter SUS304 austenitic stainless steel wetal wire. The effects of oxygen added, deposition current distribution, arc travel speed, and wire feed speed on the average width and height of the deposited bead were studied. The microstructure and mechanical properties of the deposited components were also examined. The results indicate that, compared to the conventional TIG method, the two TIG activating arc additive manufacturing not only improves forming and increases deposition efficiency but also reduces the surface tension of the deposited metal and the molten pool, enhancing their wettability and spreading characteristics, thereby further improving the deposition layer formation. Under comparable current conditions, the deposition efficiency is significantly increased, reaching 2.7 kg/h, compared to the conventional TIG arc deposition. As the deposition current of the trailing torch increases (the leading torch deposition current decreases), the average width first increases and then decreases, while the average height shows an opposite trend. With the increase in arc travel speed, both the average width and height decrease. When the wire feed speed increases, the wall height significantly increases, while the width changes little. The added of O has no significant impact on the microstructure of the deposited thin-wall componnet, which is characterized by columnar dendrites perpendicular to the deposition direction. The tensile strength and elongation rate of the deposited thin-wall slightly decrease with the introduction of O.

     

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