Effect of cold wire position on welding process in the twin-arc integrated cold wire hybrid welding
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摘要: 搭建了双电弧集成冷丝复合焊接系统,研究了冷丝不同位置对焊接过程的影响机理,其中包括冷丝作用位置对其加热熔化作用及表面成形的影响。试验结果表明:冷丝从两引导焊丝正前方送入时,熔池前端对冷丝的加热熔化作用不充分,冷丝末端会顶触熔池底部,随着冷丝的持续送进和母材的向后移动,某一时刻冷丝回弹,焊丝末端的熔滴弹出落在母材表面形成大颗粒飞溅。当冷丝从侧面送入时,熔池一侧的温度较低,影响熔池金属的流动,导致最终的焊缝成形不对称分布。当冷丝从两引导焊丝正后方送入熔池时,冷丝始终插入熔池中,焊接过程稳定,是理想的冷丝作用位置。此外,随着冷丝送丝速度的增加,两种脉冲电流模式(同相和反相)下,熔敷率均随之增加,且相差不大。同相脉冲电流下电弧对冷丝的加热熔化作用最强烈,反相脉冲电流下次之,直流模式下最弱。
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关键词:
- 双电弧集成冷丝复合焊 /
- 冷丝作用位置 /
- 冷丝送丝速度 /
- 熔敷率 /
- 电流模式
Abstract: Twin-arc integrated cold wire hybrid welding system has been established. Effect mechanism of cold wire position on welding process was studied, which included effects of cold wire position on its heating and melting situation and weld surface formation. The results showed that the melting of cold wire just depended on front end of weld pool, and melting effect of weld pool on cold wire was not sufficient when cold wire was fed in front of two leading wires. The end of cold wire would contract the bottom surface of weld pool with continuous feeding of cold wire, and the droplet melted at the wire end was ejected and fell on base metal surface to generate globular spatter with moving backward of base metal. The temperature distributed on side of weld pool decreased with feeding cold wire in side of two leading wires. In this way, the molten metal flowed in weld pool would be affected, which led to final uneven weld formation. The cold wire was stably inserted into weld pool when cold wires was fed behind two leading wires, and this was optimum cold wire position. Besides, the deposition rates increased with increase of feeding speed of cold wire and made little difference under two pulse phase differences (in-phase and reverse-phase pulse differences). The effect of arc heating and melting on cold wire was most intense at in-phase pulse current, followed by reverse-phase pulse current, subsequently direct current. -

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