Double Pulse Low-Frequency Modulation for High-Power Double-Wire Pulsed GMAW
| Autor: | Yin Tong, Zuwei He, Min Zeng, Zhuoyong Liang, Kaiyuan Wu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0209 industrial biotechnology
Materials science business.industry Mechanical Engineering 02 engineering and technology Welding 021001 nanoscience & nanotechnology Low frequency modulation Industrial and Manufacturing Engineering Double pulse Grain size Computer Science Applications Power (physics) law.invention Gas metal arc welding 020901 industrial engineering & automation Control and Systems Engineering law Optoelectronics 0210 nano-technology business Electronic circuit |
| Zdroj: | Journal of Manufacturing Science and Engineering. 140 |
| ISSN: | 1528-8935 1087-1357 |
| DOI: | 10.1115/1.4040319 |
| Popis: | A double pulse low-frequency modulation method was proposed to improve heat input control and enhance weld quality during high-power double-wire pulsed gas metal arc welding (GMAW). By constructing a mathematical model, relationships between parameters of double pulse low-frequency modulation and energy input were analyzed. A correction coefficient was added to overcome physical characteristics of charging and discharging in a welding circuit. Thus, qualitative relationships between parameters of double pulse low-frequency modulation and energy input were described more accurately. Bead-on-plate welding experiments were conducted in a synchronous phase mode. A stable welding process was achieved and perfect weld bead shapes were acquired. Modulation frequency imposed a significant effect on both weld width and penetration, while modulation duty cycle had a significant effect on penetration and little effect on weld width. Modulation frequency significantly influenced refinement of grain size. Weak and strong pulses of low-frequency modulation improved heat input control, strengthened stirring action of double pulse on weld pool, and enhanced fluidity of molten metals, thereby contributing to optimization of weld quality. |
| Databáze: | OpenAIRE |
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