Radial stacking type friction-stir welding material adding forming process for large thick-wall ring part

Abstract

Disclosed is a radial stacking type friction-stir welding material adding forming process for a large thick-wall ring part. A sheet-shaped thin-wall ring part single body is prepared through radial-axial hot rolling technology, and radial stacking type double-shaft friction-stir welding material adding forming of the thin-wall ring part single body is conducted through double-shaft friction-stir welding material adding forming technology. A welding wire used by welding needs to be preheated by a laser heater, and plasticizing of the welding wire during welding is convenient. Meanwhile, during welding, micro forging treatment needs to be conducted on plasticized metal through an ultrasonic vibration exciter, and the effect that the texture form of the metal forming a weld joint approximately completely forms a welding core is ensured. One week after welding is conducted along the weld joint, a keyhole is filled with the welding wire constantly, meanwhile, a stirring head is drawn out of a workpiece slowly, and thus welding of the first ring of thin-wall ring part single body is completed. Finally, radial stacking type friction-stir welding material adding forming of the thick-wall ring part is conducted. Through the radial stacking type friction-stir welding material adding forming process, the utilization rate of materials can be increased significantly, energy consumption is reduced, and the overall performance of the product is improved.

Description

technical field [0001] The invention belongs to the technical field of forming large metal rings, and in particular relates to a radially stacked friction stir welding additive forming process for large thick-walled rings. Background technique [0002] With the rapid development of my country's petrochemical, electric power, shipbuilding, aerospace and equipment manufacturing industries, the demand for ring parts is increasing, with more and more varieties and larger sizes, and the types of materials used are increasingly diversified. For small and medium-sized rings, the more common forming technology is to use ring rolling machines for ring rolling. However, for large rings, since the forming process requires a huge forming force to complete, large-scale rolling and forging equipment is difficult to manufacture, the manufacturing cost is high, and it is difficult to realize it by rolling technology due to the limitation of the forming capacity of the rolling mill and the f...

AI Technical Summary

Problems solved by technology

However, for large rings, since the forming process requires a huge forming force to complete, large-scale rolling and forging equipment is difficult to manufacture, the manufacturing cost is high, and it is difficult to realize it by rolling technology due to the limitation of the forming capacity of the rolling mill and the forming quality of the product. its forming

With the increase of the ingot, the solidification speed is slow, the material segregation is serious, the grains are coarse and the crack casting defects cannot be completely eliminated in the later rolling and forging process, resulting in part of the elongation and strength not meeting the design requirements.

In actual production, it is very easy to have phenomena such as skin clipping, cavity filling, and coarse grains.

Moreover, the successful rolling of large rings is often at the cost of more material loss and higher energy consumption.

In addition, the existing friction stir welding is easy to form defects such as flash, pit and keyhole at the weld

Therefore, the traditional processing methods of large thick-walled rings can no longer meet the market's high-efficiency, energy-saving, material-saving, and superior performance manufacturing requirements.

Images