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Welding inspection is highly essential presently owing to task monitoring creates of credibility and safety to the company and all users. Welding inspector is required to use much more ability and experiences including complicated technology as complemented assistance to inspect/check the welding trace in both during welding and after that. Therefore, this paper presents a detection of welding trace using films of X-ray images and 2-D wavelet transform for analyzing any defects after complete welding. The defects would be found within the welding trace in equipment or construction materials such as air bubble, incomplete weld etc. It ensures/guarantees that the equipment or construction are whether durable or safety. From the experimental results, we shall take photograph of the welding trace which might have some defects within the linkage using the X-ray films. There are 25 images of the welding trace for testing and verifying. All images can be checked for the errors in the linkage.