Study on the arc pressure of TIG welding under the condition of Ar-Ar and Ar-He supply alternately

Study on the arc pressure of TIG welding under the condition of Ar-Ar and Ar-He supply alternately

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click here In the paper, a self-made water-cooled copper plate device was used to measure and analyze the welding arc pressure of alternate argon supply under different frequencies of 1 Hz, 2 Hz, 4 Hz and argon and helium supply alternately under different frequencies of 1 Hz, 4 Hz.The experimental results indicated that in the process of alternate argon supply, the maximum arc pressure produced significant fluctuation in a diameter of 1 mm range of the arc center, resulting in the molten pool surface exposed to the acting of pulsating pressure.Besides, the arc center pressure changed with the convert of argon-arc and helium-arc during argon gas and helium gas supply alternately.And the weld seam subjected the pulsating pressure from the process animationbengal.com of argon-arc and helium-arc stroked alternately, leading to the change of welding surface formation.

Furthermore, under the condition of alternating gas supply, the weld surface presented the typical distribution pattern of fish scale.Keywords: Alternate gas supply, Arc pressure, TIG welding.