Received date: 2012-05-22
Revised date: 2012-06-14
Online published: 2012-11-11
Supported by
Supported by National Natural Science Foundation of China (Nos.51105182 and 51005106)
Cable-type welding wire (CTWW) CO2 gas shielded arc welding, which uses CTWW as consumable electrode, is an innovative arc welding process with high quality, high efficiency and low consumption, thus having significant potential of wide application in industrial manufacturing. So far, however, there is lack of deep study on this new welding technology, hindering its promotion. In this paper, the process mechanism of CTWW CO2 gas shielded arc welding is studied through combining the experimental detection and numerical simulation. By using arc multi-information collection system, the characteristics of arc shape and behavior in CTWW CO2 gas shielded arc welding process is acquired. The photographs of weld without defect are obtained. Based on the test results, the mechanism of CTWW CO2 gas shielded arc welding is explained. A finite element analysis model suitable to CTWW CO2 gas shielded arc welding is developed to simulate the temperature and stress field distribution. The results show that, there exist a unique bunchy electric arc in CTWW CO2 gas shielded arc welding, which is formed through multi--arc rotating and coupling, leading to arc heat concentration; the calculated weld cross section agrees well with the experimental data, validating the accuracy of established heat source model. When the heat input for per unit length in CTWW CO2 gas shielded arc welding is 2.9 times more than that in single welding wire (SWW) CO2 gas shielded arc welding, the weld penetration and width are 4 times and 1.7 times of those in SWW CO2 gas shielded welding, respectively. Under the same welding condition, the new welding process has a similar heat efficiency to submerged arc welding (SAW), but its weld penetration is greater, and its weld width, heat-affected zone width and peak temperature of thermal cycle are smaller. Besides, the residual stress field in CTWW CO2 gas shielded arc welding is close to that in SAW.
FANG Chenfu CHEN Zhiwei XU Guoxiang HU Qingxian ZHOU Hangyu . STUDY ON THE PROCESS OF CTWW CO2 GAS SHIELDED WELDING[J]. Acta Metall Sin, 2012 , 48(11) : 1299 -1305 . DOI: 10.3724/SP.J.1037.2012.00296
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