电焊机2026，Vol.56Issue(8)：32-40,67,10.DOI:10.7512/j.issn.1001-2303.2026.08.03
HR-2抗氢高强钢管激光焊接工艺及力学性能研究
Laser Welding of HR-2 Hydrogen-Resistant High-Strength Steel Pipes:Process Parameters and Mechanical Properties
摘要
Abstract
To meet the requirements for penetration control and defect suppression in laser welding of HR-2 hydrogen-resistant high-strength steel pipes with stepped-groove joints,a laser welding process with a defocusing distance of+2 mm was adopted.The effects of welding speed and laser power on weld formation,defects,microstructure and tensile properties were investigated.The results show that continuous welds can be obtained within the tested parameter range,and the weld cross-sections exhibit a typical wine-glass-shaped deep-penetration morphology.Considering the stepped-groove height of 2.2 mm and the pipe wall thickness of 2.88 mm,three representative parameter sets with moderate penetration depth,namely S1,S2 and S3,were selected for comparison.The S2 condition(1.5 m/min,1 300 W)produces a relatively smooth weld sur-face,moderate penetration depth and no obvious defects according to X-ray inspection and longitudinal-section observation.The S1 condition shows a risk of local incomplete fusion or insufficient penetration near the stepped-groove root,whereas the S3 condition exhibits a slight tendency toward pore formation.The weld microstructure is mainly composed of austenitic columnar and dendritic grains,with a small amount of residual δ-ferrite retained near the fusion line and stepped-groove root owing to the relatively high cooling rate.The S2 joint shows a tensile strength of 728 MPa and an elongation of 37.6％,and both the inner and outer fracture surfaces are dominated by dimples,indicating a good strength-ductility balance.关键词
抗氢高强钢/激光焊接/止口结构/焊缝成形/力学性能Key words
hydrogen-resistant high-strength steel/laser welding/stepped-groove joint/weld formation/mechanical properties分类
矿业与冶金引用本文复制引用
张成蹊,涂画,蒋俊俊,周晓辉,刘福运,徐富家,韩晓辉,武鹏博,檀财旺..HR-2抗氢高强钢管激光焊接工艺及力学性能研究[J].电焊机,2026,56(8):32-40,67,10.基金项目
国家自然科学基金项目(52475332) （52475332）
国家自然科学基金项目(52505360) （52505360）
山东省自然科学基金(ZR2025MS722) （ZR2025MS722）
