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Flash Welding Forming Method of Cobalt-Based Superalloy Large Section Rings

A high-temperature alloy, large-section technology, used in welding equipment, welding power sources, resistance welding equipment, etc., can solve the problems of welding quality influence, discontinuity, unstable temperature field, etc., and achieve a reasonable temperature field and stable preheating process. Effect

Active Publication Date: 2016-08-24
贵阳安大宇航材料工程有限公司
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  • Application Information

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Problems solved by technology

Although this method can form a temperature field, it does not disclose specific process parameters, and this method uses intermittent preheating to establish a temperature field and a flash process to adjust the temperature field, so the process is discontinuous. The formed temperature field is unstable, which will have a certain impact on the welding quality

Method used

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  • Flash Welding Forming Method of Cobalt-Based Superalloy Large Section Rings
  • Flash Welding Forming Method of Cobalt-Based Superalloy Large Section Rings
  • Flash Welding Forming Method of Cobalt-Based Superalloy Large Section Rings

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[0031] The main chemical element content (percentage by weight) of the alloy is: 0.05% to 0.15% of C content, 20.0% to 24.0% of Cr content, 20.0% to 24.0% of Ni content, 13.0% to 16.0% of W content, 13.0% to 16.0% of W content, La content 0.03% ~ 0.12%, Si content 0.20% ~ 0.50%, Fe content ≤ 0.30%, B content ≤ 0.015%, Mn content ≤ 1.25%, P content ≤ 0.020%, S content ≤ 0.015 %, containing Ag ≤ 0.0010%, containing Bi ≤ 0.0001%, containing Pb ≤ 0.0010%, containing Cu ≤ 0.07%, and the balance being Co.

[0032] The flash welding forming process steps of the alloy large cross-section ring are as follows:

[0033] Step 1: Preheat. Fix the left end 121 of the cobalt-based superalloy large-section ring billet 100 with an opening on the left clamp 111, and fix the right end 122 on the right clamp 112; set the working power of the flash welder to be P=420KVA~980KVA, and the current I 0 =45KA~55KA, when the power is turned on, the distance between the openings at both ends is relative...

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Abstract

The invention discloses a flash welding forming method for a cobalt-based high-temperature alloy large-section annular piece. The flash welding forming method comprises the steps that a cobalt-based high-temperature alloy large-section annular blank with an opening is fixed to a clamp, a power source is connected, the current is made to flow across the back from the left end to arrive at the right end to form circulation, and preheating is conducted; then, the right end is driven to move close to the left end, and weak flash is conducted; the feeding speed is increased, the current is regulated, strong flash is conducted, and a temperature field is formed; the length of a high-temperature mushy zone and the length of a high-temperature coarsening zone are worked out according to the temperature field, and thus the upsetting distance is determined to conduct upsetting; pressure maintaining is conducted for a period. By means of the method, the stable and reasonable temperature field can be formed, it can be ensured that metal in the high-temperature mushy zone can be ejected out of a matrix in the upsetting process and metal in the high-temperature coarsening zone can be in fully plastic deformation, grains are refined through reversion and recrystallization, and the flash welded annular piece good in quality is obtained. The flash welding forming method is used for the flash welding forming of the annular piece large in section area.

Description

technical field [0001] The invention relates to a welding method, in particular to a flash welding forming method of a cobalt-based superalloy large-section ring. Background technique [0002] Flash welding is a kind of solid-state welding. A certain temperature field is formed on the two welding end faces of the workpiece through flashing, and then the workpiece is welded by the action of upsetting force. Therefore, a reasonable match between the temperature field and the upsetting parameters is the key to achieving high-quality welding. A suitable temperature field can provide suitable diffusion activation energy for the metal atoms, accelerate the mutual diffusion of atoms at both ends during the upsetting deformation process, and meet the requirements of the upsetting process. Process metal plastic deformation requirements, and the establishment of the temperature field is mainly determined by the flash stage. The temperature field formed by the flash process is mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/04B23K11/34B23K11/24B23K11/36
CPCB23K11/04B23K11/18B23K11/34B23K11/36
Inventor 江飞龙占立水张钢丰高先模杨亚平
Owner 贵阳安大宇航材料工程有限公司
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