Argon-arc welding-braze welding composite welding method for connecting the titanium alloy and steel

Abstract

The invention belongs to the welding technology field and relates to an argon-arc welding-composite braze welding method used for welding titanium alloy and steel. When the titanium alloy is welded with the steel, Nb is used as an intermediate layer; arc welding is conducted towards the titanium alloy and the intermediate Nb layer by using a titanium welding wire in an argon chamber; and braze welding is conducted towards the titanium alloy and the intermediate Nb layer. The method uses Nb as the intermediate layer, and utilizes fusion welding and the braze welding to weld Nb with two parent metals of the titanium alloy and the steel respectively, thus avoiding the direct contact of the titanium and iron in the two kinds of parent metal, and preventing cracks from being formed by brittle phase produced when the titanium and the steel are directly welded. Copper manganese matrix solder and silver copper titanium solder are selected for braze welding Nb and the steel, and the corresponding temperature avoids the damage to the property of the parent metals of titanium alloy.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to an argon arc welding-brazing composite welding method for welding titanium alloy and steel. Background technique [0002] Titanium and titanium alloys have high specific strength and good corrosion resistance, and have been widely used in aviation, aerospace, nuclear industry, petroleum, chemical and other fields. With the increasing application of titanium alloys, the welding of titanium and other metals, especially the connection and compounding of titanium alloys and steel has become a basic problem that needs to be solved. [0003] In the welding process of titanium alloy and steel, on the one hand, due to the large difference in the linear expansion coefficient and thermal conductivity of the two, the deformation is different during the welding heating and cooling process, resulting in a large internal stress in the joint; on the other hand, due to the titanium The solid sol...

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Problems solved by technology

In addition, Ti and Nb are infinitely soluble, and the connection between the two can be easily realized by conventional welding methods, while Nb and Fe and Ni in the steel can form certain intermetallic compound phases and affect the performance of the joint.

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