Analysis of Influence Factors and Multivariable Regression Prediction of Penetration for Automatic GMAW

doi:10.3901/JME.2018.18.055

Abstract

Abstract: No penetration and "Excessive penetration" are easy to appear in automatic backing GMAW, which becomes the bottleneck of welding automation. Taking the back-bead width as the reference information characterizing the penetration state, the influences of the 4 welding parameters of welding current, welding speed, groove gap and angle on the back-bead width are studied. The backing GMAW tests are carried out, and the data analysis of the results show that, with the increase of the welding current, the back-bead width increases, and the penetration state changes from "No penetration" to "Excessive penetration"; with the increase of the welding speed, the back-bead width decreases, and the penetration state changes from "Excessive penetration" to "No penetration"; the back-bead width increases with the groove gap or angle, and the small gap and angle are easy to cause "No penetration". Since the back-bead width increases or decreases monotonously with the increase of each welding parameter, a mathematical model of the 4 welding parameters and back-bead width is established by the multivariable linear regression, which passed tests of Goodness of Fit, Overall Significance of Regression and Significance of Variables. The mathematical model is verified by GMAW tests, and the results showed that the mathematical expression of the regression model can predict the back-bead width accurately. The study provides guidance for the parameters adjustment of automatic backing GMAW.

Key words: automatic welding, back-bead width prediction, backing welding, gas metal arc welding, multivariable regression model

CLC Number:

TG409

MA Ke, XUE Long, HUANG Junfen, HUANG Jiqiang, ZOU Yong, JIANG Tiansheng. Analysis of Influence Factors and Multivariable Regression Prediction of Penetration for Automatic GMAW[J]. Journal of Mechanical Engineering, 2018, 54(18): 55-61.

References

[1] XUE Long,ZOU Yong,HUANG Jiqiang,et al. Constant speed control for complex cross-section welding using robot based on angle[J]. Chinese Journal of Mechanical Engineering,2014,27(2):260-268.
[2] 朱庆太,李伟. 焊接机器人在焊接自动化技术中的应用现状探讨[J]. 装备制造技术,2016,12:183-184. ZHU Qingtai,LI Wei. Application status of welding robot in welding automation technology to explore[J]. Equipment Manufacturing Technology,2016,12:183-184.
[3] ZOU Yong,JIANG Lipei,LI Yunhua,et al. Welding deviation detection algorithm based on extremum of molten pool image[J]. Chinese Journal of Mechanical Engineering,2016,29(1):74-83.
[4] 蒋艺飞,冯国雄,张佳佳,等. 中厚板焊接机器人焊接质量提升方法[J]. 装备制造技术,2015,11:144-146. JIANG Yifei,FENG Guoxiong,ZHANG Jiajia,et al. Welding quality improvement method for medium and heavy plate welding robot[J]. Equipment Manufacturing Technology,2015,11:144-146.
[5] 黄继强,薛龙,黄军芬,等. 高压环境下CMT焊接电弧行为及焊缝性能[J]. 金属学报,2016,52(1):93-99. HUANG Jiqiang,XUE Long,HUANG Junfen,et al. Arc behavior and joints performance of CMT welding process in hyperbaric atmosphere[J]. Acta Metallurgica Sinica,2016,52(1):93-99.
[6] XUE Long,WU Jinming,HUANG Junfen,et al. Welding polarity effects on weld spatters and bead geometry of hyperbaric dry GMAW[J]. Chinese Journal of Mechanical Engineering,2016,29(2):351-356.
[7] 黄宗仁,董岱林,冯琳娜,等. 核电厂主管道手工焊与自动焊工艺对比分析[J]. 电焊机,2015,11(45):107-111. HUANG Zongren,DONG Dailin,FENG Linna,et al. Comparison and analysis of manual welding and automatic welding in primary piping of nuclear power plant[J]. Electric Welding Machine,2015,11(45):107-111.
[8] 刘立君,兰虎,郑红艳,等. MIG焊电弧声信号与熔透状态相关性[J]. 机械工程学报,2010,46(14):79-84. LIU Lijun,LAN Hu,ZHENG Hongyan,et al. Relationship between arc sound signal and penetration status in MIG welding[J]. Journal of Mechanical Engineering,2010,46(14):79-84.
[9] 岳建峰,李亮玉,王天琪,等. 基于正面焊接多信息融合的GMAW熔透控制[J]. 机械工程学报,2009,45(11):283-287. YUE Jianfeng,LI Liangyu,WANG Tianqi,et al. Penetration control of GMAW based on multi-informational fusion from the front surface[J]. Journal of Mechanical Engineering,2009,45(11):283-287.
[10] 李春凯,石玗,顾玉芬,等. 连续脉冲GTAW不同熔透状态熔池振荡频率特征及分析[J]. 机械工程学报,2016,52(20):44-50. LI Chunkai,SHI Yu,GU Yufen,et al. Characteristic and analysis of weld pool oscillation frequency in different penetration status for continuous P-GTAW[J]. Journal of Mechanical Engineering,2016,52(20):44-50.
[11] 高向东,梁剑斌,刘桂谦,等. 大功率光纤激光焊熔透状态模糊聚类识别方法[J]. 焊接学报,2017,38(5):22-25. GAO Xiangdong,LIANG Jianbin,LIU Guiqian,et al. Identification of high-power fiber laser welding penetration based on fuzzy clustering algorithm[J]. Transactions of the China Welding Institution,2017,38(5):22-25.
[12] LIU Y K,ZHANG W J,ZHANG Y M. Estimation of weld joint penetration under varying GTAW pools[J]. Welding Journal,2013,92(11):313-321.
[13] 杨嘉佳,王克鸿,吴统立,等. 基于熔池视觉特征的铝合金双丝焊熔透识别[J]. 焊接学报,2017,38(3):49-52. YANG Jiajia,WANG Kehong,WU Tongli,et al. Welding penetration recognition in aluminum alloy tandem arc welding based on visual characters of weld pool[J]. Transactions of the China Welding Institution,2017,38(3):49-52.
[14] 李亮玉,王燕. 基于焊接温度场正面信息的熔透控制方法及验证[J]. 机械工程学报,2002,38(12):116-120. LI Liangyu,WANG Yan. Penetration control method and verification based on the positive information of welding temperature[J]. Journal of Mechanical Engineering,2002,38(12):116-120.
[15] 赵明,武传松,胡庆贤,等. TIG焊接熔透熔池形状和表面变形的数值模拟[J]. 机械工程学报,2006,42(10):203-208. ZHAO Ming,WU Chuansong,HU Qingxian,et al. Numerical simulation of TIG welding pool shape and surface deformation[J]. Journal of Mechanical Engineering,2006,42(10):203-208.
[16] 樊丁,顿小春,张刚,等. 钨极氩弧焊熔池动态行为和焊工调控特征信息检测与分析[J]. 机械工程学报,2018,54(2):27-33. FAN Ding,DUN Xiaochun,ZHANG Gang,et al. Detection and analysis of weld pool dynamic behavior and welder control information in GTAW[J]. Journal of Mechanical Engineering,2018,54(2):27-33.
[17] MOHSEN K,MASOOD A,EHSAN H J,et al. Optimization of the depth of penetration by welding input parameters in SAW process using response surface methodology[J]. Metallurgical and Materials Transactions B,2016,47(1):714-719.
[18] 张刚,樊丁,石玗,等. 焊接电参数对GTAW熔透状态的影响[J]. 焊接学报,2016,37(2):25-28. ZHANG Gang,FAN Ding,SHI Yu,et al. Effect of welding electric parameters on weld penetration of GTAW[J]. Transactions of the China Welding Institution,2016,37(2):25-28.
[19] 张永强,陈武柱,双元卿,等. 激光-MIG复合焊熔透状态评价方法[J]. 焊接学报,2010,31(8):41-44. ZHANG Yongqiang,CHEN Wuzhu,SHUANG Yuanqing,et al. Evaluation method of penetration statuses in LASER-MIG hybrid welding[J]. Transactions of the China Welding Institution,2010,31(8):41-44.
[20] 陈华斌,樊重建,林涛,等. 基于前馈补偿的五通连接器机器人GTAW熔透控制[J]. 上海交通大学学报,2009,43(1):71-74. CHEN Huabin,FAN Chongjian,LIN Tao,et al. Penetration control of robotic GTAW for five-port connector based on feedforward compensation[J]. Journal of Shanghai Jiaotong University,2009,43(1):71-74.