Welding method for molded surface of invar alloy composite material forming mold

Abstract

The invention provides a welding method for the molded surface of an invar alloy composite material forming mold. The method comprises the following steps: selecting binary mixed protective gas, wherein the binary mixed protective gas comprises argon gas and helium gas; determining the target gas pressure of the binary mixed protective gas; determining a welding groove angle of the molded surface of the invar alloy composite material forming mold as a target angle; determining a target welding voltage and a target welding current; and based on the target air pressure, the target welding voltage and the target welding current, welding the molded surface of the invar alloy composite material forming mold. According to the method, the welding efficiency of the molded surface of the invar composite material forming mold is improved, the manufacturing period of the molded surface is greatly shortened, and the phenomena of air leakage and slag inclusion of the molded surface are prevented.

Description

technical field [0001] The invention belongs to the technical field of helicopter manufacturing technology, and in particular relates to a welding method for forming a model surface of an invar alloy composite material. Background technique [0002] Because the thermal expansion coefficient of Invar alloy (INVAR) is close to that of composite materials, Invar alloy (INVAR) materials are widely used in the manufacture of molding dies in the molding process of aerospace composite parts. [0003] The manufacturing difficulty of Invar alloy (INVAR) frame mold lies in the extremely high welding requirements, all welds must not have blisters and slag inclusions, which will cause air leakage. One day (8 hours) the welding length is less than 1 meter, resulting in an excessively long manufacturing cycle, which greatly restricts the production capacity of the INVAR frame mold in the workshop. Contents of the invention [0004] In view of the above technical problems, the present i...

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Problems solved by technology

[0003] The manufacturing difficulty of Invar alloy (INVAR) frame mold lies in the extremely high welding requirements, all welds must not have blisters and slag inclusions to cause air leakage, at this stage only tungsten argon arc welding can be used, the welding efficiency is extremely low, and a single worker One day (8 hours) welding length is less than 1 meter, resulting in too long manufacturing cycle, which greatly restricts the production capacity of the INVAR frame mold in the workshop

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