Detection of slag inclusions using infrared thermal imagining system

Assuring high quality of welded joins is a vital task in many industrial branches also when joints are made manually. It the case metal-arc welding with covered electrode. One main imperfection, that can occur this process slag inclusion. In paper an method for detection inclusion multipass manual proposed and validated. The key idea small temperature disturbances will be noticeable consecutive cross-section joint cooling pass. Temperature distribution weld face was measured longwave infrared camera (LWIR). For IR representation differences mean calculated to assess rate directly after elements were welded. because on each thermogram whole visible, thus position electrode time easily marked. Results compared radiographic images joints. future additional studies performed order generalize wider group materials more complex welds.