Title: An evaluating method for the shielding characteristics of arc welding torches: development of a new visualizing method

Authors: Y. Awano, T. Kishi, H. Suzuki

Addresses: Chief Research Fellows, Metal Forming, Welding & Heat Treatment, Engineering Dept., Toyota Motor Corporation, Toyota-shi, Japan. ' Chief Research Fellows, Metal Forming, Welding & Heat Treatment, Engineering Dept., Toyota Motor Corporation, Toyota-shi, Japan. ' Chief Research Fellows, Metal Forming, Welding & Heat Treatment, Engineering Dept., Toyota Motor Corporation, Toyota-shi, Japan

Abstract: Whether blowholes, one of the defects of arc welding with shielding gas, occur or not depends on the shape of the gas flow from the welding torch to the molten pool on the welding material. Until now, there has been little research done on controlling the gas flow shape; therefore there have been no effective methods for preventing blowhole occurrence. Blowholes occur when the concentration of shielding gas on the molten pool becomes thin. Taking this point into consideration, a new method for visualizing both concentration and distribution of the shielding gas flow was developed, which bears a direct relationship to the number of blowholes formed during welding.

Keywords: arc welding torches; blowholes; defects; gas flow; shielding gas; visualisation; molten weld pool.

DOI: 10.1504/IJMPT.1988.036694

International Journal of Materials and Product Technology, 1988 Vol.3 No.1, pp.83 - 94

Published online: 06 Nov 2010 *

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