Root welding process in laser-TIG hybrid welding of titanium alloy thick plate

SHI Ji-peng; ZHOU Yan-bin; LIU Li-ming

doi:10.3788/OPE.20162413.0280

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Root welding process in laser-TIG hybrid welding of titanium alloy thick plate

更新时间：2020-08-13

- Root welding process in laser-TIG hybrid welding of titanium alloy thick plate
- Optics and Precision Engineering Vol. 24, Issue 10s, Pages: 280-286(2016)
- 作者机构：
  
  大连理工大学材料科学与工程学院,辽宁大连,116024
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162413.0280
  CLC： TG456
- Received：20 May 2016，
  
  Revised：15 June 2016，
  
  Published：14 November 2016
- 稿件说明：
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史吉鹏, 周彦彬, 刘黎明. 钛合金厚板激光-电弧复合热源打底焊工艺[J]. 光学精密工程, 2016,24(10s): 280-286

SHI Ji-peng, ZHOU Yan-bin, LIU Li-ming. Root welding process in laser-TIG hybrid welding of titanium alloy thick plate[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 280-286
史吉鹏, 周彦彬, 刘黎明. 钛合金厚板激光-电弧复合热源打底焊工艺[J]. 光学精密工程, 2016,24(10s): 280-286 DOI： 10.3788/OPE.20162413.0280.

SHI Ji-peng, ZHOU Yan-bin, LIU Li-ming. Root welding process in laser-TIG hybrid welding of titanium alloy thick plate[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 280-286 DOI： 10.3788/OPE.20162413.0280.

摘要

针对航空钛合金厚板结构件打底焊时存在的自动化程度低，焊缝成形难以控制，生产效率低等制约行业发展的瓶颈问题，采用低功率脉冲激光-TIG复合热源焊接技术对10 mm厚钛合金板材进行了打底焊工艺及焊缝成形机理的试验研究。采用视觉图像监测技术对脉冲激光作用前后的等离子体行为和熔池状态变化进行了观察和分析。试验结果表明：低功率脉冲激光-TIG复合热源焊接时，脉冲激光对TIG电弧有诱导增强作用的同时还对熔池流动与电弧热量分布有调控作用。将热源间距调到3mm时电弧压缩到激光作用点附近，熔池在耦合电弧挖掘力的作用下向后流动促使熔池热量向后转移，此时热源分布到熔池正、背面的热量使背面熔池受力平衡、稳定，可获得成形良好焊缝，其接头的屈服强度和抗拉强度分别为母材的96.3%和95.8%，能够满足使用要求。

Abstract

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%.

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references

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