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Metallographic examination of defects in welds performed by butt welding

In the production of pipes, quality control is performed sequentially in several stages. First of all, it’s an incoming inspection. The next step is non-destructive testing (NDT) in the production flow using devices (ultrasonic, eddy current or magnetic), periodic sampling and factory testing in laboratory (visual measurement, mechanical property determination, metallographic inspection of cross sections in the welded joint area). The final step is the non-destructive testing of measuring pipes (outgoing inspection) and hydraulic testing. This article presents the results of the study of the fragments of 48 mm longitudinal electric-welded pipes made of steel grade 10 in the post-production condition, in order to detect surface cracks of small opening, detected by visual inspection.