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公开(公告)号：US5359172A
公开(公告)日：1994-10-25
申请号：US998218
申请日：1992-12-30
CPC分类号： B23K26/28 , F28F11/00 , F28F2275/067
摘要： The wall of a pressure vessel tube having stress-corrosion cracks or the like is repaired by localized melting using laser welding, for fusing over defects by melting and re-solidifying the metal. A high powered laser beam is focused at a limited area or spot on the internal wall of the tube. The welding head is operated at sufficient power and is relatively moved in the tube at a sufficient rate to melt the spot while advancing along a line on the internal surface of the wall. The wall is melted to a depth of part or all of the thickness of the wall. Points at which the tube has been melted by the focused beam cool following passage of the welding head. The welding head is also advanced laterally of the line, either continuously or stepwise. Localized melting and cooling of the tube material continues progressively, line by overlapping and/or adjacent line, to melt and reform the degraded area. By successively melting, and optionally alloying linear sections of the wall using an alloying material, stress-corrosion cracks and similar defects are fused over, repairing the degraded area. The localization of the melting is such that the metal does not substantially flow and the metal cools quickly following passage of the weld head, to below a temperature of sensitization.
摘要翻译： 通过使用激光焊接的局部熔化来修复具有应力腐蚀裂纹等的压力容器管的壁，通过熔融和再固化金属来熔化缺陷。 高功率激光束聚焦在管的内壁上的有限区域或点上。 焊接头以足够的动力运行，并以足够的速率在管中相对移动，以在沿着壁的内表面上的线前进的同时融化点。 墙壁被熔化成壁的一部分或全部厚度的深度。 通过焊接头通过后聚焦光束熔化管的点。 焊接头也可以连续地或逐步地在线的横向前进。 管材的局部熔化和冷却逐渐地通过重叠和/或相邻的管线进行排列，以熔化和改造退化区域。 通过使用合金材料依次熔化和任选地使壁的线性部分合金化，应力腐蚀裂纹和类似的缺陷融合在一起，修复了退化区域。 熔化的定位使得金属基本上不流动，并且金属在焊接头经过后迅速冷却至低于敏化温度。
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公开(公告)号：US5789720A
公开(公告)日：1998-08-04
申请号：US524667
申请日：1995-09-08
CPC分类号： F28F11/00 , B23K26/28 , B23P6/00 , F28F2275/067
摘要： The wall of a pressure vessel tube having cracks or other discontinuities is repaired by localized melting with the addition of an alloying material. The melting reforms or eliminates the discontinuity while the alloying material improves the physical and chemical properties of the reformed tube wall. The alloying material may be added as an insert or as a weld wire. The insert may be melted in only its center section to ensure that the entire weld is properly alloyed. Sections of the insert which are not melted may be expanded to be in intimate contact with the tube. The weld wire feed means may be integral with the welding head. A post-weld stress relief process may be applied to the welded area to reduce residual stress generated by the welding operation.
摘要翻译： 具有裂纹或其他不连续性的压力容器管的壁通过添加合金材料的局部熔化来修复。 当合金材料改善重整管壁的物理和化学性质时，熔化改进或消除不连续性。 合金材料可以作为插入物或焊丝加入。 插入件只能在其中心部分熔化，以确保整个焊缝适当地合金化。 未熔化的插入物的部分可以膨胀以与管子紧密接触。 焊丝进给装置可以与焊接头一体。 可以对焊接区域施加焊后应力释放过程，以减少由焊接操作产生的残余应力。
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