Quality assessment of the welding of components of the burning wall in the case of the energy boiler

The quality of joints in welded structures very often determines their suitability for further safe operation. The quality of welds assessed at least B, according to the PN-EN ISO 5817 standard, is the criterion for allowing many welded structures to be used in working conditions. The quality level B can be considered good, provided that the tested construction is not intended for use in extreme working conditions or in high-risk conditions. Strict acceptance criteria are applied to such environments, and the welds tested preferably meet the requirements of class B and do not have any defects. Even small discrepancies in the form of blisters, concave faces, etc. (qualifying for quality class B welds) should not be found in welds used for responsible steel constructions working in hazardous conditions. These defects may cause a loss of consistency of the material and, consequently, lead to a serious disaster. The article evaluated the quality of welded joints of selected welded elements of a power boiler. The inspection of welded joints was aimed at confirming the correctness of their performance and compliance with the technological and construction documentation as well as with the tightened technical acceptance conditions. As a result of visual and non-destructive tests, ultrasonic joints were allowed or withdrawn from further safe operation.