Circular seam lock bottom connector and manufacturing and welding method thereof

Abstract

The invention provides a circular seam lock bottom connector and a manufacturing and welding method thereof. The method mainly comprises the steps of connector design, part preparing, welding preparing, assembling and spot welding, and formal welding. The connector design mainly focuses on the problem that due to the non-penetration state of laser welding of the lock bottom connector, air holes are formed easily, a groove is designed in a lock bottom part, the groove achieves the penetration state of laser welding on the structure, and the problem of the air holes can be solved. In order to relieve the situation that due to the groove, when gas in a closed cavity is heated and swelled in the welding process, small holes of laser welding and a molten bath are disturbed, and the welding stability is influenced, a ditch is designed in the lock bottom part, the ditch can communicate with the closed cavity and the outside, when heated swelling and cooling shrinkage occur in the laser welding process, the gas in the cavity breathes freely and circulates with the outside, the gas pressure in the cavity is stable, and thus disturbance on the molten bath for the laser welding and the smallholes is avoided.

Description

technical field [0001] The invention relates to the field of laser welding, in particular to a circular seam bottom lock joint and a manufacturing and welding method thereof. Background technique [0002] Due to the technical characteristics of non-penetrating welding, the bottom lock joint has a smooth inner wall, and the maximum temperature of the thermal cycle of the inner wall temperature is lower than the melting point of the inner wall material, which is especially suitable for the design of welded joints with a closed structure with fillers. For example, the stainless steel combustion chamber casing of a certain type of lateral force solid rocket motor adopts a bottom-lock joint design and is formed by welding. In addition, for the circular seam butt joint of large-scale thin-walled parts, the bottom-lock joint is easier to achieve reliable assembly and positioning. For example, the connection between the barrel section and the end frame of a titanium alloy annular st...

AI Technical Summary

Problems solved by technology

However, the laser deep penetration welding mode has poor adaptability to the bottom-locked joint. Due to the impenetrable state, large penetration depth, and fast welding speed, the air bubbles at the bottom of the small hole in laser welding have no time to overflow to the surface of the molten pool and form air holes, which affects internal quality of the weld

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