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Yu H.,Shaoxing Special Equipment Testing Institute | Xu Y.,Shanghai JiaoTong University | Song J.,Shaoxing Special Equipment Testing Institute | Pu J.,Shaoxing Special Equipment Testing Institute | And 2 more authors.
Optics and Laser Technology | Year: 2015

An on-line approach based on arc spectral information was proposed to monitor the hydrogen porosity in Al-Mg alloy pulsed gas tungsten arc welding. For this purpose, spectral lines of the hydrogen and argon components of the arc atmosphere were analyzed when porosities occurred, and that interference of the continuous spectra involved in these lines was eliminated. The peak component of the intensity ratio of the H I line at 656.28 nm to the Ar I line at 641.63 nm was extracted as the characteristic signal to avoid the pulse interference and the non-hydrogen disturbances. Based on the statistical analysis of the extracted characteristic signal under different welding conditions, a predicting model for weld porosity detection was established and successfully used to identify the most probable position of the native porosity as well as the exact position of the artificial porosity. © 2015 Elsevier Ltd.


Yu H.,Shaoxing Special Equipment Testing Institute | Song J.,Shaoxing Special Equipment Testing Institute | Zhang G.,Shaoxing Special Equipment Testing Institute | Pu J.,Shaoxing Special Equipment Testing Institute | And 2 more authors.
Advances in Intelligent Systems and Computing | Year: 2015

In order to perform height tracing of the welding torch for sound welding quality in the Al–Mg alloy pulsed GTAW, an arc length sensing method based on arc light was introduced and the essential factors involved in the sensing process was studied by means of visual and spectroscopic technologies. The results showed that the arc light intensity and the arc length were in quadratic relationship rather than in linear relationship and that the relationship deviates from a linear relation was because of the arc heat loss. Based on the quadratic relationship between the spectral line intensity at Ar I 852.14 nm for peak current and the arc length, the arc spectroscopic technology can sense arc length precisely with an error not more than 0.2 mm. While the arc length reached to large values, cooling effects caused by the increment of arc volume and the metal vapor would decrease the arc heat transferred to weld pool and also caused arc center column constriction, and thus there was an optimum arc length for the best arc heat efficiency in the Al–Mg alloy pulsed GTAW. © Springer International Publishing Switzerland 2015.

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