Electric arc preheating repair welding method for stir friction plug

A technology of friction stir welding and friction stir, which is applied in the direction of non-electric welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of broken stirring needles, reduced mechanical properties of joints, poor continuous fluidity of materials, etc., to ensure one-time forming, High process stability and reproducibility, low weld residual stress effect

Inactive Publication Date: 2011-02-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for arc preheating friction stir plug repair welding, to solve the problem that the strong resistance of the material in the repair welding part of the friction stir plug causes the stirring needle to break without complete plastic deformation and flow, resulting in material failure. Poor continuous fluidity, which reduces the mechanical properties of joints

Method used

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  • Electric arc preheating repair welding method for stir friction plug
  • Electric arc preheating repair welding method for stir friction plug
  • Electric arc preheating repair welding method for stir friction plug

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specific Embodiment approach 1

[0011] Specific implementation mode one: combine figure 1 Describe this embodiment mode, this embodiment mode is realized through the following steps: Step 1, carry out arc preheating to the keyhole left over during friction stir welding or secondary friction stir welding repair: place the circular ring 5 made of copper on stirring horizontally On the keyhole part left by friction welding, and the center of the ring 5 coincides with the center of the keyhole. The central aperture of the ring 5 should be larger than the aperture of the keyhole. The ring 5 is heated by arc, and the heating temperature is 180°C-220°C. After the ring 5 is heated, the heat is transferred to the area to be repaired, so that the keyhole of the area to be repaired is preheated. The ideal preheating temperature is 180°C-220°C. If the temperature is higher than the ideal preheating temperature, stop the arc heating immediately; if the temperature is lower than the ideal preheating temperature, start the...

specific Embodiment approach 2

[0012] Specific implementation mode two: combination figure 2 and image 3 To illustrate this embodiment, the arc heating system in step one of this embodiment is composed of argon tungsten arc welding machine, ring 5, eight thermocouples 6 and eight-channel thermometer 7, the argon tungsten arc welding machine The welding gun head 3 is aligned with the upper surface of the ring 5, one end of the eight thermocouples 6 is connected to the eight-channel thermometer 7, and the other ends of the eight thermocouples 6 are evenly placed on the contact surface between the ring 5 and the workpiece , placed in a position such as image 3 As shown, the heat of the arc is conducted to the area to be repaired through the ring 5 to realize the indirect preheating of the arc. The thermocouple 6 monitors the temperature of the preheating area in real time to realize the control of the preheating temperature. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Specific implementation mode three: combination figure 1 To illustrate this embodiment, the heating of the ring 5 in Step 1 of this embodiment can be performed by single arc heating or multi-arc heating. Single arc heating is to use a welding torch to make circular motion on the upper surface of the ring 5 to form a single arc for uniform heating; multi-arc heating is to use two to eight welding torches to distribute evenly on the upper surface of the ring 5 and synchronize them on the upper surface of the ring 5. Make a circular motion on the upper surface of the machine to form multiple arcs to achieve sufficient and uniform preheating of the area to be repaired. Other steps are the same as in the first embodiment.

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Abstract

The invention discloses an electric arc preheating repair welding method for a stir friction plug, relates to a repair welding method for the stir friction plug and aims to solve the problem of poor continuous flowability of a material because a stirring needle is broken before complete plastic deformation and flow under the action of strong resisting force of a material at a repair welding position of the stir friction plug. The method comprises the following steps of: 1, performing electric arc preheating on a key hole left by friction stir welding or secondary friction stir welding repairing, namely, putting a circular ring at a key hole position until the center of the circular ring is coincided with that of the key hole, performing electric arc heating on the circular ring by using a tungsten electrode argon arc welding machine at the temperature of between 180 and 200 DEG C and transferring heat to a region needing repair welding after the circular ring is heated so as to preheat the key hole in the region needing repair welding, wherein the central pore diameter of the circular ring is greater than that of the key hole; and 2, performing repair welding on the key hole, namely, during repair welding, moving a welding tool towards a welding direction by 1 to 5 millimeters and allowing the stirring needle to undergo plastic deformation and flow so as to fill the key hole. The method is used for performing repair welding on the weld defects of the stir friction welding and the key hole.

Description

technical field [0001] The invention relates to a method for repairing welding of a friction stir plug. Background technique [0002] Friction stir welding is to use the stirring head to insert the part to be welded of the workpiece, and rotate the stirring head at high speed to make friction and stirring between the workpiece and the workpiece. The friction heat makes the metal in this part in a thermoplastic state and under the pressure of the stirring head, it moves from the front to the rear. Plastic flow, so that the two parts to be welded are connected as a whole. The metal to be welded does not melt during the welding process, and it is a solid phase connection method. This method avoids defects such as porosity and cracks associated with fusion welding, and achieves a high-quality connection of materials. Although the friction stir welding method can obtain high-quality welded joints, it is difficult to completely avoid weld defects in practical engineering operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/24B23K20/12
Inventor 黄永宪韩冰郑祖金刘会杰吕世雄冯吉才冷劲松李垚
Owner HARBIN INST OF TECH
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