{'fraction_non_alphanumeric': 0.012515644555694618, 'fraction_numerical': 0.0, 'mean_word_length': 5.6115702479338845, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Residual stress state behaviour under fatigue loading in pipeline welded joints

Compressive residual stress state behaviour under fatigue of the welded joints of a pipeline were investigated. The regions on the intersection between the welded joints of the longitudinal pipe manufacturing seam and the circumferential welded joints of the pipeline construction were investigated. Stress-controlled fatigue loading was carried out at various stress ratios of the yield strength of the base metal. Surface residual stresses were introduced in samples by shot-peening treatment and were measured using X-ray diffraction techniques. The results showed that compressive residual stresses which, unless they are relieved or inverted during the process of fatigue loading, make crack initiation difficult.