摘要：None of any known techniques of welding guar-anties a welded joint without a defect. The regulated sizesof defects are conditional. If a defect is found during a con-trol or service exceeds the normal size, often a doubt ariseswhether to reject it or after performing some calculationsto make clear that the crack appeared during operationdoes not cause the structural element critical state – failure[1-3].
