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Repair method for welding defects of large-size friction stir welding

A friction stir welding and welding defect technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of welding defect repair, lack of material at welding defect positions, etc., to improve weld formation, reduce workload, process The effect of high stability

Inactive Publication Date: 2018-11-13
NANJING ZHONGCHE PUZHEN URBAN RAIL VEHICLE CO LTD
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Problems solved by technology

However, when the size of the weld defect is large, the lack of material at the welding defect position is more serious. At this time, simple secondary friction stir welding cannot complete the repair of the welding defect

Method used

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  • Repair method for welding defects of large-size friction stir welding
  • Repair method for welding defects of large-size friction stir welding
  • Repair method for welding defects of large-size friction stir welding

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Embodiment 1

[0029] refer to Figure 1 to Figure 4 , a method for repairing welding defects of large-scale friction stir welding, which is realized by the following steps:

[0030] Step 1: Process the weld area where the large-size welding defect 3 left over by friction stir welding is processed, and process a V-shaped opening groove 5, the width of the opening groove 5 is 2 to 3 mm larger than the width of the welding defect 3, and the depth of the opening groove 5 is The depth of the opening groove 5 is 1~2mm greater than the depth of the welding defect 3, and the length of the opening groove 5 is 3~5mm longer than the length of the welding defect 3; after the opening groove is processed, the large-size welding defect 3 disappears and is invisible.

[0031] Step 2, use MIG welding to weld and fill the area where the open slot 5 processed in step 1 is located, and the welding torch 7 is perpendicular to the surface of the workpiece. After the welding is completed, the open slot 5 is compl...

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Abstract

The invention discloses a repair method for welding defects of large-size friction stir welding. The repair method comprises the following steps of: (1) forming an open groove in a welding defect position of the friction stir welding; (2) filling and welding the open groove by adopting a fusion welding method which can add a filling material; (3) welding a fusion welding process repair welding region by adopting pullback type friction stir welding, wherein a welding tool moves in the welding direction of the last friction stir welding step; the welding tool moves forwards again after the repair welding region is welded; and meanwhile a stirring needle is gradually pulled back; and (4) after the stirring needle is pulled back, stopping the welding tool for 1-5 seconds and starting to lift up the welding tool to obtain a repair welded joint which is good in surface formation, excellent in mechanical properties and free of keyholes in surface so as to finish the repair welding. The repairmethod for the welding defects of large-size friction stir welding disclosed by the invention is high in process stability, economic efficiency and operability, and remarkably improves the mechanicalproperties of a repair welding seam; and the repair welded joint is good in surface formation and free of keyholes.

Description

technical field [0001] The invention relates to a method for repairing welding defects of large-scale friction stir welding, which belongs to the field of welding technology. Background technique [0002] Friction stir welding (FSW) technology is a solid phase welding technology invented by the British Welding Institute (TWI) in 1991. Compared with fusion welding, friction stir welding has small deformation, low thermal crack tendency, low residual stress, Excellent mechanical properties and other advantages, especially suitable for welding aluminum alloys, magnesium alloys and other low melting point, high thermal conductivity metals. However, friction stir welding has high requirements for the assembly of weldments. For large-scale structural parts, inconsistent assembly gaps and heights due to tolerances and other reasons may cause defects in the welding process. The common welding defects of friction stir welding include surface defects, such as flash, keyhole, surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02
CPCB23K28/02
Inventor 戴忠晨付宁宁火巧英云中煌夏宁王红波
Owner NANJING ZHONGCHE PUZHEN URBAN RAIL VEHICLE CO LTD
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