Indian Welding Journal

Masao Ushio ¹, Kenji Ikeuchi ¹, Manabu Tanaka ¹, Takeshi Seto ¹

Affiliations
1 Osaka University, Ibaraki, Osaka 567, JP

Abstract

Metal transfer phenomena in high current GMA welding with several kinds shielding gas have been systemetically investigated with high speed cine camera Typical transfer modes are classified into four types, depending on the welding current : globular transfer, axial spray transfer, swinging spray transfer, and rotating spray transffer. The dependence of the transfer mode as welding current can be explained by the instability melted electrode using numerical modeling based on MHD theory.

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Masao Ushio ¹, Hideyuki Yamamoto ¹, Youshinori Nishida ¹, Tsuneo Mita ¹

Affiliations
1 Matsushita Industrial Equipment Co. Ltd, JP

Abstract

Since the 1982 introduction of inverter control technology into an arc welding power source, it has proliferated throughout gas shielded arc welding processes in Japan The requirements for inverter sources have been based upon the improvement of welding performance coming from high-speed control of current, rather on than many improvements on functional aspects such as miniaturization weight reduction and of electricity. Particularly, efforts for the most part have focused on the analyses of welding arc phenomena and how to control the phenomena with external parameters. Consequently varous waveform control systems have been developed.

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