Double-sided groove robot welding procedure of hydraulic steel structure

CAI Yunxiu; LI Dou; LI Fei

doi:10.7512/j.issn.1001-2303.2020.05.22

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Double-sided groove robot welding procedure of hydraulic steel structure
Vol. 50, Issue 5, Pages: 107-110(2020)
Published：2020
DOI： 10.7512/j.issn.1001-2303.2020.05.22
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DOI：

CAI Yunxiu, LI Dou, LI Fei. Double-sided groove robot welding procedure of hydraulic steel structure[J]. Eletric Welding Machine2020, 50(5): 107-110. DOI： 10.7512/j.issn.1001-2303.2020.05.22.

摘要

基于弧焊机器人对接平焊双面不对称坡口焊接工艺

通过试验研究焊接电流、焊接速度等工艺参数对焊接质量的影响。结果发现:针对20mm厚Q345B热轧钢板不对称双边坡口

打底采用电流170A、焊接速度0.25 m/min时

焊缝成形良好

填充高度合适

焊缝背面根部成形良好;采用脉冲MAG焊接

电流245 A、焊接速度0.25 m/min时

背面焊缝根部完全熔透

焊缝热影响区未出现淬硬组织

且钝边处的熔宽由常规MAG焊的3 mm增加至5 mm

解决了水电水工钢结构行业焊接自动化应用不清根难以实现的工艺难题。

Abstract

Based on the welding procedure of butt downhand welding of double-sided asymmetric groove with arc welding robot

the influence of welding current and welding speed on welding quality is studied by experiment. The results show that for 20 mm asymmetric double groove

with the backing welding parameters of current of 170 A and welding speed of 0.25 m/min

the appearance of weld is good

the filling height is suitable

and the back weld root is well formed. When using pulse MAG welding with current of 245 A and welding speed of 0.25 m/min

the back weld root is completely pene-trated

no hardened structure appears in the heat affected zone

and the molten width of truncated edge increases from 3 mm for MAG welding to 5 mm for pulsed MAG welding. This solves the technical problem that the welding automation application is difficult to realize without back chipping in the hydropower hydraulic steel structure industry.