Research on Control Method of Nitrogen Content and Porosity in Hybrid Welding Joint of High Nitrogen Steel

doi:10.3969/j.issn.1000-1093.2019.11.016

Abstract

Abstract: The laser-arc hybrid welding test of high nitrogen steel was carried out to solve the porosity and nitrogen loss of high nitrogen steel during welding. The effects of shielding gas composition, welding wire composition and ultrasonic vibration on the porosity and nitrogen content of welded joint were investigated. The results show that, when the shielding gas is Ar+N₂, the nitrogen content of welded point increases with the proportion of nitrogen in the shielding gas, and the porosity decreases first and then increases. When 2% O₂ is added to Ar+N₂, the nitrogen content and porosity increase obviously. With the increase in the proportion of nitrogen, the nitrogen content in welded joint increases, but the porosity changes irregularly. With the increase in nitrogen content in the welding wire, the nitrogen content of welded joint increases first and then decreases, and the porosity decreases first and then increases. With the increase in ultrasonic power, the nitrogen content of welded joint decreases slightly, and the porosity decreases first and then increases. Appropriate shielding gas and welding wire composition can be used to improve the nitrogen content of welded joint, and inhibit the formation of weld porosity. The porosity is suppressed in the best effect when the ultrasonic power is 180 W. Key

Key words: highnitrogensteel, hybridwelding, weldingporosity, nitrogencontent, shieldinggas, weldingwire, ultrasonicvibration

CLC Number:

CUI Bo， ZHANG Hong， LIU Shuangyu， LIU Fengde. Research on Control Method of Nitrogen Content and Porosity in Hybrid Welding Joint of High Nitrogen Steel[J]. Acta Armamentarii, 2019, 40(11): 2311-2318.

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第40卷
第11期2019 年11月兵工学报ACTA
ARMAMENTARIIVol.40No.11Nov.2019

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