TIG welding method of Ti-based composite material and Ni-based alloy in lap joint with additional Cu middle layer

A technology of titanium-based composite materials and nickel-based alloys, applied in welding equipment, metal processing equipment, arc welding equipment, etc., can solve the problems of many brittle Ti-Ni phases, large post-weld joint stress, and difficult connection.

Active Publication Date: 2017-05-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of difficult Ti/Ni dissimilar connections, high joint stress after welding, and many brittle Ti-Ni phases due to ...

Method used

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  • TIG welding method of Ti-based composite material and Ni-based alloy in lap joint with additional Cu middle layer
  • TIG welding method of Ti-based composite material and Ni-based alloy in lap joint with additional Cu middle layer
  • TIG welding method of Ti-based composite material and Ni-based alloy in lap joint with additional Cu middle layer

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specific Embodiment approach 1

[0012] Specific embodiment 1: The TIG welding method of a titanium-based composite material and a nickel-based alloy with Cu interlayer overlapping in this embodiment is carried out according to the following steps:

[0013] The titanium-based composite material and the nickel-based alloy are processed into plates with a thickness of 2.0 mm, polished and cleaned respectively to obtain the titanium-based composite plate and the nickel-based alloy plate; the titanium-based composite plate and the nickel-based alloy plate are overlapped, Then place the Cu intermediate layer with a thickness of 0.1 mm to 0.2 mm in the middle of the overlapping parts of the titanium-based composite sheet and the nickel-based alloy sheet to obtain the piece to be welded; fix the piece to be welded on the welding platform in the welding sealed box, The titanium-based composite plate is located on the upper part, and high-purity argon gas is introduced into the welding sealed box as a protective gas fo...

specific Embodiment approach 2

[0015] Embodiment 2: This embodiment differs from Embodiment 1 in that: the titanium-based composite material is a network-structured TiBw / TC4 alloy-based composite material. Other steps and parameters are the same as those in the first embodiment.

[0016] The TiBw / TC4 alloy-based composite material with network structure is specifically prepared according to the following steps:

[0017] 1. Mechanical powder mixing: mix 3% TiB by mass percentage 2 Powder and 97% TC4 titanium alloy powder are mechanically mixed with a ball mill, and the mixing time is 4 to 12 hours;

[0018] 2. Hot pressing sintering: Put the mixed composite powder into a vacuumized airtight container for hot pressing sintering. The temperature is directly heated from room temperature to 1100-1500 °C, and the pressure is maintained at 15-30 MPa, and the pressure-holding time is 0.5-5 hours. , and the titanium-based composite material can be obtained after cooling to room temperature; wherein, the particle s...

specific Embodiment approach 3

[0019] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the volume fraction of the reinforcing phase in the network structure TiBw / TC4 alloy matrix composite material is 5%. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a TIG welding method of a Ti-based composite material and a Ni-based alloy in lap joint with an additional Cu middle layer in order to solve the problems that Ti/Ni dissimilar connection is difficult, the post-welded joint stress is large, and numerous brittle Ti-Ni phases exist due to complete melting of a welding area. The method includes the step that a TIG welded net structure TiBw/TC4 composite material and a high-temperature Ni-based alloy in lap joint with the additional Cu middle layer are adopted. On the one hand, stress in a Ti/Ni dissimilar joint is reduced, on the other hand, the Cu middle layer is low in melting point, completely melts and reacts with a base material on the two sides in the welding process, and accordingly, the number of formed brittle Ti-Ni phases such as Ti2Ni is decreased; and welding is conducted in a lap joint mode, the TiBw/TC4 composite material at the joint can be controlled to partially melt, and therefore, the high-strength Ti/Ni dissimilar joint of the layered structure can be obtained.

Description

technical field [0001] The invention relates to a TIG welding method for overlapping a titanium-based composite material and a nickel-based alloy with a Cu intermediate layer added. Background technique [0002] The network structure TiBw / TC4 composite material (ZL200810136852.8) has the characteristics of light weight, high specific stiffness, high specific strength, and high heat resistance. , has broad application prospects in aerospace engine 550 ℃ ~ 800 ℃ high temperature components. Nickel-based superalloys are widely used in high-temperature components at 750°C to 1000°C, but their densities are generally high. In order to ensure the performance requirements and realize the lightweight requirements, different materials are used in different parts to achieve the maximum weight reduction effect, and it is especially necessary to realize the high-performance connection of Ti / Ni dissimilar metals. [0003] The welding of titanium and nickel metals has always been a weld...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/23B23K9/235
CPCB23K9/167B23K9/232B23K9/235
Inventor 黄陆军安琦刘悦耿林郜雅楠姜山王帅崔喜平
Owner HARBIN INST OF TECH
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