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论文类型：期刊论文

发表时间：2016-10-01

发表刊物：Guangxue Jingmi Gongcheng/Optics and Precision Engineering

收录刊物：EI、PKU、ISTIC、Scopus

卷号：24

页面范围：280-286

ISSN号：1004924X

摘要：Aiming at the restrictions of lower degree of automation, difficult weld reform control and inefficiency in root welding of titanium alloy, a laser-arc hybrid welding technique was realized to fabricate a titanium alloy plate with thickness of 10 mm. The welding process and weld seam forming mechanism were investigated experimentally. During the interaction between pulsed laser with low power and TIG arc plasma, the plasma behaviors and molten pool state were monitored using a visual system. The result indicates that pulsed laser can not only improve the arc discharge, but also regulate the flow of the molten pool and heat distribution of TIG arc during the hybrid welding process. The arc was gathered nearby the acting point of laser with a distance between the two heat sources is 3 mm, where the molten pool was forced to flows backwards by the coupled arc bonding force and heat transfers backwards. Meanwhile the heat distributed in the front and back of the molten pool keeps the stress balanced and stable, resulting in a well surface appearance welding seam with yield strength of 96.3% and tensile strength of 95.8%. ? 2016, Science Press. All right reserved.