Welding scheme for crown wear-resistant block of single crystal turbine blade

Abstract

The invention provides a welding scheme for a crown wear-resistant block of a single crystal turbine blade and relates to the technical field of non-traditional machining. According to the welding scheme, welding current is adjusted to be 30-45 A, the amount of argon is adjusted to be 8-12 L/min, and the crown part of the blade fixed on a fixture is subjected to surfacing for 1-5 s; then the surfacing effect is checked, whether an alloy is full, whether a corner R is provided with holes and whether a welding part has crack defects are checked, and blades with defective appearance are removed;hardness of substrates of an accumulation layer and a surfacing position, crystalline phase structure of the substrates in the surfacing position, welding quality and depth of a fusion layer at a weldjoint are subjected to metallographic inspection. The condition of falling of the wear-resistant block after welding can be solved, repeated brazing caused by falling of the wear-resistant block during brazing is avoided, so that production time is saved, cost is saved, qualification rate of argon arc welding surfacing is high, machining quality is guaranteed, and production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of special processing, in particular to a welding scheme of a wear-resistant block of a single crystal turbine blade crown. Background technique [0002] The working blade of a certain turbine is a complex air-cooled hollow single crystal blade. Its shape is composed of a blade body, a blade crown and a tenon. [0003] The design requires the use of vacuum brazing to weld the wear-resistant block on the blade crown. Since the thickness of the wear-resistant block is 1.4mm, it is too thick to be suitable for brazing. In addition, the wettability of the solder to the wear-resistant block is not good, resulting in The bonding force between the matrix and the wear-resistant block is poor. After brazing, the wear-resistant block is easy to fall off. Repeated brazing, coupled with the good fluidity of the brazing material, is likely to cause the tail edge split seam to be blocked by solder, resulting in scrapping ...

AI Technical Summary

Problems solved by technology

[0003] The design requires the use of vacuum brazing to weld the wear-resistant block on the blade crown. Since the thickness of the wear-resistant block is 1.4mm, it is too thick to be suitable for brazing. In addition, the wettability of the solder to the wear-resistant block is not good, resulting in The bonding force between the matrix and the wear-resistant block is poor. After brazing, the wear-resistant block is easy to fall off. Repeated brazing, coupled with the good fluidity of the brazing material, is likely to cause the tail edge split seam to be blocked by solder, resulting in scrapping of the blade. Serious Affected the normal delivery of blades

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