High speed imaging technique Part 2 – High speed imaging of power beam welding phenomena

Tsukamoto, Shiro

doi:10.1179/136217110x12785889549949

Cited by 47 publications

(19 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7 demonstrates the porosity distribution in the longitudinal section at the centerline of the weld metal with different beam offset positions. Until now, an unequivocal explanation for porosity formation in titanium welds is unavailable, most research studies indicated that keyhole instability was the main reason for porosity formation [14][15][16][17][18].…”

Section: Appearance Of the Weld Jointsmentioning

confidence: 98%

Effect of laser beam offset on microstructure and mechanical properties of pulsed laser welded BTi-6431S/TA15 dissimilar titanium alloys

Zhang

Shen

et al. 2015

Optics & Laser Technology

View full text Add to dashboard Cite

Section: Appearance Of the Weld Jointsmentioning

confidence: 98%

Effect of laser beam offset on microstructure and mechanical properties of pulsed laser welded BTi-6431S/TA15 dissimilar titanium alloys

Zhang

Shen

et al. 2015

Optics & Laser Technology

View full text Add to dashboard Cite

“…For vertical up and vertical down welding positions, although the dimensions and solidifying time of weld pools can be similar when laser welding with the same welding parameters, there exist totally different escape routes. For vertical up welding position ( Figure 9 a), the voids or gas bubbles formed will move upwards in the weld pool in response to the buoyancy, similarly to that revealed using a transmission X-ray imaging system in the laser welding of other materials, such as aluminum alloys and steels [ 18 , 19 ]. Some of these voids and bubbles will move out of the weld pool through the interface between the weld pool and keyhole before the metal solidifies, while others cannot move out of the weld pool and form pores in the solidified welds.…”

Section: Discussionmentioning

confidence: 71%

Study of Gravity Effects on Titanium Laser Welding in the Vertical Position

Chang

Zhang

et al. 2017

Materials

View full text Add to dashboard Cite

Abstract:To obtain satisfactory welds in positional laser beam welding, it is necessary to know how process parameters will influence the quality of welds in different welding positions. In this study, the titanium alloy Ti6Al4V sheets were laser welded in two vertical welding positions (vertical up and vertical down), and the appearance, porosity, strength, and ductility of the laser joints were evaluated. Results show that undercuts of the vertical up welds were greater than that of vertical down welds, while the porosity contents were much higher in vertical down welds than that in vertical up welds. When welding with a higher heat input, the vertical up welding position resulted in poor weld profiles (undercuts and burn-through holes), whereas the vertical down welding position led to excessive porosity contents in welds. Both severe undercut and excessive porosity were detrimental to the tensile properties of the welds. Weld appearance was improved and porosity contents were reduced by using a lower heat input, achieving better weld quality. Therefore, it is suggested that process parameter settings with relatively high laser powers and welding speeds, which can result in lower heat inputs, are used when laser welding the Ti6Al4V titanium alloys vertically.

show abstract

“…The visual detection method is the most promising seam recognition technology, due to its abundant information, non-contact with workpiece, high precision and good sensitivity [ 2 , 3 , 4 ]. However, there are serious challenges when detecting the seam of the aerospace components [ 5 , 6 , 7 ]: Specular reflection surface of the workpiece.…”

Section: Introductionmentioning

confidence: 99%

A Precise Visual Method for Narrow Butt Detection in Specular Reflection Workpiece Welding

Zeng

Chang

et al. 2016

Sensors

View full text Add to dashboard Cite

During the complex path workpiece welding, it is important to keep the welding torch aligned with the groove center using a visual seam detection method, so that the deviation between the torch and the groove can be corrected automatically. However, when detecting the narrow butt of a specular reflection workpiece, the existing methods may fail because of the extremely small groove width and the poor imaging quality. This paper proposes a novel detection method to solve these issues. We design a uniform surface light source to get high signal-to-noise ratio images against the specular reflection effect, and a double-line laser light source is used to obtain the workpiece surface equation relative to the torch. Two light sources are switched on alternately and the camera is synchronized to capture images when each light is on; then the position and pose between the torch and the groove can be obtained nearly at the same time. Experimental results show that our method can detect the groove effectively and efficiently during the welding process. The image resolution is 12.5 μm and the processing time is less than 10 ms per frame. This indicates our method can be applied to real-time narrow butt detection during high-speed welding process.

show abstract

High speed imaging technique Part 2 – High speed imaging of power beam welding phenomena

Cited by 47 publications

References 81 publications

Effect of laser beam offset on microstructure and mechanical properties of pulsed laser welded BTi-6431S/TA15 dissimilar titanium alloys

Effect of laser beam offset on microstructure and mechanical properties of pulsed laser welded BTi-6431S/TA15 dissimilar titanium alloys

Study of Gravity Effects on Titanium Laser Welding in the Vertical Position

A Precise Visual Method for Narrow Butt Detection in Specular Reflection Workpiece Welding

Contact Info

Product

Resources

About