A method of checking whether the welding lock bottom is completely removed

Abstract

The invention, which belongs to the detection technology of electron beam welding lock bottom turning, relates to a method for checking whether welding lock bottom is removed completely. The method comprises: (1), for a to-be-welded single piece, a lock bottom structure is changed, compared with the joint without a lock bottom, the overlap joint length of the joint with a lock bottom is increased by 2 to 3 mm; (2), normal welding is carried out; (3), a lock bottom trimming residual situation is checked after lock bottom process completion, and the lock bottom side is touched by the finger to check whether the extra part of a platform is reserved; if a platform lock bottom with the length of 2 to 3 mm occurs, turning processing is carried out continuously until the platform lock bottom can not be touched completely. With the method, a problem that the lock bottom can not be removed completely by turning because of low parts precision or equipment precision as well as the narrow part structure after electron beam welding of drum type parts of the new-generation aircraft engine can be solved. Therefore, the method has the great significance in improving the detection technology level of the new-generation aircraft engine and gas turbine.

Description

technical field [0001] The invention relates to a detection technology for electron beam welding bottom lock processing, in particular to a method for checking whether the welding bottom lock is completely removed. Background technique [0002] In order to prevent electron beam weld leakage and undercut of the weld surface during electron beam welding, and to form a good weld shape, usually we need to leave a pad on the inside of the welded joint. After welding is completed Then remove the liner by machining, and usually we design this liner to be integrated with one side of the joint to be welded, while the other side of the joint to be welded overlaps the liner and the two The end faces to be welded are in precise contact. We usually refer to this type of joint to be welded as a "joint form with a bottom lock", that is, the pad is the bottom lock. According to the requirements, after the electron beam welding of the drum parts, the bottom of the lock needs to be removed b...

AI Technical Summary

Problems solved by technology

The reality is that the drum parts are connected by several single discs through electron beam welding. There are webs in each level of single discs. A special structure is required, the cutting space is narrow, and it is impossible to measure visually or with a measuring tool. Therefore, to judge whether the weld seam bottom has been completely removed and the remaining reinforcement has no bottom bottom part, it depends on the dimensional accuracy of the workpiece and the accuracy of the machine tool. We have nothing to do except guarantee

However, if the joint size of the single disc part is out of tolerance or the accuracy of the machine tool is poor, it is impossible to ensure that the bottom of the weld seam is completely removed during the processing. Then the workpiece processing is likely to be like this: that is, due to the out-of-tolerance inside the joint of the part (such as The inner diameter of the welding joint is too small, which leads to the fact that the processor does not completely remove the bottom locking position of the joint in order to ensure a certain required value of the inner reinforcement, and it is likely to leave a width equal to the width of the contact surface of the two, and a thickness of Several to a dozen thin rings in the remaining part of the bottom of the lock, because we cannot judge when and to what extent the ring can be completely removed, and there is no means of observation or detection, and the remaining part of the bottom of the lock is in contact with the inside of the weld The surface is in close contact, and it is impossible to judge that this part is the bottom of the connector lock by touching with fingers, so it is easy to miss such as Figure 4 As shown, the actual turning position of the bottom lock is lower than the theoretical position, causing the residue of the bottom lock to fall off during the subsequent high-speed operation, which brings a huge unknown risk to the entire system

[0004] from Figure 4 It can be seen that due to the inability to perform direct detection and the size of the workpiece and the accuracy of the machine tool, the actual turning position is lower or higher than the theoretical position, so the following situations may occur when the engine is running: Figure 5 As shown, the burrs fall off due to the lock bottom not being cleaned.

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