This paper presents an evaluation of an infrared sensor for monitoring the welding pool temperature in a Gas Tungsten Arc Welding (GTAW) process. The purpose of the study is to develop a real time system control. It is known that the arc welding pool temperature is related to the weld penetration depth; therefore, by monitoring the temperature, the arc pool temperature and penetration depth are...

For hot extrusions of magnesium alloy sheets, Dissimilar AZ80 and AZ31 were used, in which AZ80 was placed on advancing side and AZ31 on retreating side, using friction stir butt welding with different process parameters. Some defect-free welded joints with good weld surfaces could be obtained with some suitable welding conditions. The maximum tensile strength of welded joint which is 225.5 MPa...

A method based on Kalman filtering is proposed for weld defect detection in real-time radiographic NDT of spiral pipes. The existence of the image noises and the inhomogeneity of the background contrast induce numerous false alarms. In this paper, the trajectory continuity of the defects in the image sequence is detected by Kalman filtering for the identification of true defects. Potential defe...

Abstract The suspected circumferential weld defects found in the pipeline inspection process were tested and studied. It was that there slag inclusion girth at 9 o’clock, which had not been early stage or laboratory nondestructive testing process. are most likely due to incomplete removal between layers low welding wire energy. There a root crack 6 o’clock position of weld, length 10 mm, close ...

An investigation on bridging larger welding gaps between workpieces occurring in practice due to structural requirements or to defects in weld edge preparation is described. Some characteristic cases from practice where a larger root gap should be bridged or the space between two or three workpieces should be filled with a greater quantity of filler material are described. Submerged-arc welding...

Abstract Defects in the welds degrade quality of weld. Weld defect identification is a challenging task industry because wide range weld imperfections. detection using radiographic images an effective technique for achieving good shipbuilding and aerospace applications. Foreign inclusions, cracks pores are examples welding joint Several appropriate computer-based image processing techniques hav...

The magnetic flux leakage (MFL) detection technique is applied to the of weld defects, such as cracks and pores. As has a distinct structure, there are differences in magnetization path field intensity under different directions. According surveys, suitable direction can significantly enhance rates small-sized defects by stimulating stronger signal defect leakage. In this study, ANSYS finite el...