Double-sided groove robot welding procedure of hydraulic steel structure

水工钢结构双面坡口机器人焊接工艺 Double-sided groove robot welding procedure of hydraulic steel structure 蔡云秀 CAI Yunxiu 1 first-author 李斗 LI Dou 2 李飞 LI Fei 3 云南机电职业技术学院机械工程系 云南机电职业技术学院机械工程系 Yunnan Vocational College of Mechanical and Electrical Technology Mechanical Engineering department Yunnan Vocational College of Mechanical and Electrical Technology Mechanical Engineering department 中国水利水电第十四工程局有限公司 中国水利水电第十四工程局有限公司 SINOHYDRO BUREAU 14CO.,LTD. SINOHYDRO BUREAU 14CO.,LTD. 昆明理工大学城市学院 昆明理工大学城市学院 City College of Kunming University of Science and Technology City College of Kunming University of Science and Technology 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。 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. 弧焊机器人 脉冲MAG焊 中厚板 不清根 双面不对称坡口 TG444.2 云南省教育厅科学研究基金项目（2018JS541） 2022-03-08 5 50