In the method for eliminating residual stress, pass through ultrasonic weld seam

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• 2. 一种用于焊缝残余应力消除的复合装置及方法 [P] . 中国专利： CN113278788A . 2021-08-20
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  机译： 基本上消除内部焊接的钢管纵向焊缝中的残余磁性的方法

• 4. Method for eliminating residual magnetism in pipe-blank for welded steel pipe longitudinally seam-welded from inside [P] . 美国专利： US4107503A . 1978-08-15

  机译： 从内部纵向缝焊的焊接钢管的管坯消除残留磁性的方法

• 5. Method for Calculating Residual Stresses in the Seam Metal of Welded Pipeline Joints (Variants) [P] . US2022018812A1 . 2022-01-20

  机译： 计算焊接管道接头缝金属中的残余应力的方法（变体）

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