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A pre-filled friction stir spot welding method for eliminating hole defects

A friction stir and pre-filling technology, used in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of insufficient plastic flow ability of welding materials, affecting the mechanical properties of spot welded joints, poor welding quality stability, etc. Weak connection surface, eliminate hole defects, improve the effect of welding quality

Active Publication Date: 2020-11-24
SHANGHAI DIANJI UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the process of friction stir spot welding, there is still a certain amount of material loss, and due to the rapid withdrawal of the stirring sleeve during the filling stage and the insufficient plastic flow capacity of the welding material, hole defects often occur at the joint between the stirring sleeve and the base metal
The existence of hole defects will seriously affect the mechanical properties of spot welded joints, especially the fatigue properties of joints, resulting in poor stability of welding quality, so they must be eliminated to ensure the quality of joint welding

Method used

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  • A pre-filled friction stir spot welding method for eliminating hole defects
  • A pre-filled friction stir spot welding method for eliminating hole defects
  • A pre-filled friction stir spot welding method for eliminating hole defects

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Embodiment Construction

[0021] refer to Figure 1a-Figure 1e , a friction spot welding method for eliminating hole defects, including superimposing welding workpieces, in this embodiment, superimposing two welding workpieces, that is, superimposing the first welding workpiece 4 and the second welding workpiece 5 on Together, the clamping sleeve 3 is clamped on the outer wall of the stirring sleeve 2, the stirring sleeve 2 is set on the outer wall of the stirring needle 1, and the clamping sleeve 3, the stirring sleeve 2 and the stirring needle 1 are arranged on the top surface of the welding workpiece; through the stirring sleeve 2 The welding with the rotation and relative movement of the stirring needle 1 and the friction between the welding workpiece and the spot welding method includes the following steps:

[0022] The first step, the zero-adjustment stage, adjust the stirring tool to zero, adjust the position of the lower surface of the stirring needle 1 and the stirring sleeve 2, so that it is ...

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Abstract

The invention discloses a prefilling friction stir spot welding method capable of eliminating hole defects. The method comprises a zeroing phase, a pressing phase and a prefilling phase; a stirring sleeve is maintained to rotate in situ; meanwhile, a stirring needle is rotated to downwards prefill by a certain depth to eliminate a gap between a plastic material and the stirring needle; and meanwhile, a certain filling forging force can be applied to the plastic material under the stirring needle. The method further comprises a filling phase and a finishing phase. Through the prefilling actionof the stirring needle, the gap between a welding material and the stirring needle caused by the material loss is eliminated; and a certain filling forging force can be applied to the welding materialon the lower side, so that the welding material can be quickly extruded and filled in a cavity formed by extraction of the stirring sleeve in the filling phase, and the hole defects in the welding process are eliminated.

Description

Technical field: [0001] The invention relates to a welding technical field, in particular to a pre-filled friction stir spot welding method for eliminating hole defects. Background technique: [0002] Filled friction stir spot welding technology is a new solid phase joining technology proposed by the German GKSS Research Center in 1999. The stirring tool of this technology adopts a split structure, which consists of three parts: a stirring needle, a stirring sleeve and a clamping sleeve. Through the precise control of the relative position of each part of the stirring tool, the backfilling of the welding material is realized by the downward pressure of the stirring needle while the stirring sleeve is retracted, thereby forming a flat surface and no keyhole spot welding joint. [0003] However, in the friction stir spot welding process, there is still a certain amount of material loss, and due to the rapid withdrawal of the stirring sleeve during the filling stage and the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12
CPCB23K20/1225
Inventor 杨洪刚
Owner SHANGHAI DIANJI UNIV
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