科创中国

原文链接：万方

• 作者：

  FENG Shengqiang,TERASAKI Hidenri,KOMIZO Yuichi,HU Shengsun,CHEN Donggao,MA Zhihua

• 摘要：

  Nondestructive techniques for appraising gas metal arc welding(GMAW) faults plays a very important role in on-line quality controllability and prediction of the GMAW process. On-line welding quality controllability and prediction have several disadvantages such as high cost, low efficiency, complication and greatly being affected by the environment. An enhanced, efficient evaluation technique for evaluating welding faults based on Mahalanobis distance(MD) and normal distribution is presented. In addition, a new piece of equipment, designated the weld quality tester(WQT), is developed based on the proposed evaluation technique. MD is superior to other multidimensional distances such as Euclidean distance because the covariance matrix used for calculating MD takes into account correlations in the data and scaling. The values of MD obtained from welding current and arc voltage are assumed to follow a normal distribution. The normal distribution has two parameters: the mean ? and standard deviation of the data. In the proposed evaluation technique used by the WQT, values of MD located in the range from zero to ?+3? are regarded as "good". Two experiments which involve changing the flow of shielding gas and smearing paint on the surface of the substrate are conducted in order to verify the sensitivity of the proposed evaluation technique and the feasibility of using WQT. The experimental results demonstrate the usefulness of the WQT for evaluating welding quality. The proposed technique can be applied to implement the on-line welding quality controllability and prediction, which is of great importance to design some novel equipment for weld quality detection.

• 关键词：

  evaluation technique Mahalanobis distance normal distribution welding fault gas metal arc welding

• 作者单位：

  Ningbo Branch of China Academy of Ordnance Science%Joining and Welding Research Institute, Osaka University,Osaka 567-0047,Japan%Tianjin Key Laboratory of Advanced Joining Technology,Tianjin University

• 基金项目：

  Supported by Ningbo Municipal Natural Science Foundation of China (Grant No.2014A610063)

• 来源期刊：

  中国机械工程学报(英文版)

• 年，卷(期)：

  2014006