An evaluating method for the shielding characteristics of arc welding torches: development of a new visualizing method
by Y. Awano, T. Kishi, H. Suzuki
International Journal of Materials and Product Technology (IJMPT), Vol. 3, No. 1, 1988

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.

Online publication date: Sat, 06-Nov-2010

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