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公开(公告)号：US5667706A
公开(公告)日：1997-09-16
申请号：US643223
申请日：1996-05-03
CPC分类号： B23K26/106 , B23K26/28 , B23K26/342
摘要： A laser welding apparatus and method are used to weld the inner surface of small diameter tubes such as nuclear heat exchanger tubes. A weld filler metal carried by a rotatable laser weld head is fed into the weld zone to produce deeply penetrating weldments of low profile. The apparatus and method can effectively be used to repair cracks in heat exchanger tubes to thereby provide extended service life.
摘要翻译： 使用激光焊接装置和方法来焊接诸如核热交换器管的小直径管的内表面。 由可旋转的激光焊头承载的焊接填充金属被馈送到焊接区域中以产生具有低外形的深穿透焊接件。 该设备和方法可以有效地用于修复热交换器管中的裂纹，从而延长使用寿命。
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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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