A method of repairing long-volume defects in metal components by friction stir welding
A technology for friction stir welding and metal components, which is applied in metal processing equipment, welding equipment, non-electric welding equipment, etc., and can solve the problems of thinning of the repaired area of metal components, reduced fatigue life of joints, and easy occurrence of interface defects. The effect of increasing metallurgical bonding effect, increasing performance, and not reducing thickness
Active Publication Date: 2018-11-23
SHENYANG AEROSPACE UNIVERSITY
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[0005] CN103962715 A patent document discloses a vertical compensation friction stir welding process, which mainly aims at the large gap problem caused by the dimensional error caused by plate processing, and proposes vertical compensation friction stir welding, which adopts friction stir welding by adding compensation materials at the gap position Welding method for repair, but due to two interfaces at the joint position, it is difficult to form the weld and prone to interface defects
[0006] The CN103212778A patent document discloses a crack repair method based on friction stir, which only uses a needleless stirring head to repair the defects near the surface of the metal material, but fails to realize the repair along the depth direction of the plate, and the thickness of the repair area of the metal component will be thinned, resulting in Stress concentration, reduced fatigue life of joints
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[0028] The present invention will be further described below in conjunction with drawings and embodiments.
[0029] In this embodiment, friction stir welding is used to repair the internal defect 8 of the casting made of air holes and cracks in the aluminum alloy metal member 6 shown in Fig. 3(a). The operation steps are as follows:
[0030] Step 1, excavate the pores and cracks in the metal member 6 to form a long strip groove 9 (section is П-shaped) as shown in Figure 3 (b), the width and depth of the long strip groove are respectively 3mm and 2mm; then fill the elongated groove with filler metal 7 that is homogeneous to the metal component and of the same size as the groove (such as figure 2 shown);
[0031] Step 2. Place the metal component in step 1 on the backing plate, use multiple spacers (not shown) to level the repaired area of the metal component, and then fix it;
[0032] Step 3, fixing the filler metal in the elongated hook groove of the metal member by fric...
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Abstract
The invention discloses a method for repairing long volume type defects in a metal component by utilizing friction stir welding. The method comprises the following steps of: 1, digging irregular long volume type defects of a to-be-repaired metal component to form long-strip-shaped grooves, and filling the grooves with homogeneous or heterogeneous metal; 2, putting the metal component onto a base plate for being fixed, and enabling a to-be-repaired area to be in a horizontal state; 3, using a needle-free stirring head to fix filling metal into long-strip-shaped grooves of the metal component through friction stir welding; 4, using a stirring head with a stirring needle and a static shaft shoulder which is matched with the stirring head to carry out friction stir welding on filling metal and the metal component; and 5, after friction stir welding is completed, carrying out re-vibrating on the to-be-repaired area by utilizing ultrasonic vibrating. The method disclosed by the invention can solve the technical problem in repairing of long volume type defects of the metal component, and has the advantages of being good in metallurgical bonding with the to-be-repaired area, high in strength, flat and smooth in surface and small in internal stress.
Description
technical field [0001] The invention relates to metal welding, in particular to a method for repairing long-volume defects in metal components by friction stir welding. Background technique [0002] Magnesium alloys and aluminum alloys are widely used in the manufacturing industry due to their low density, high specific strength and specific stiffness. During the casting process of magnesium alloy and aluminum alloy, defects of various shapes often appear on the surface, which affects the quality of magnesium alloy or aluminum alloy casting structural parts, and even leads to product scrapping in severe cases. The current technology for repairing surface defects of magnesium alloys and aluminum alloys has problems such as performance degradation after repair, structural dimensional accuracy cannot be guaranteed, and complex processes. [0003] As a new solid phase joining technology, friction stir welding has been adopted because of its peak temperature lower than the melti...
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IPC IPC(8): B23K20/12
CPCB23K20/1245
Inventor 姬书得孟祥晨张利国刘震磊黄若飞吕赞
Owner SHENYANG AEROSPACE UNIVERSITY
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