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Pulse current auxiliary type pre-welding preheating and post-welding stress relief method for high-strength titanium alloy

A technology of pulse current and pre-welding preheating, applied in arc welding equipment, welding equipment, welding accessories, etc., can solve the problem of inconsistency between the surface and core of thick plates, high requirements for heating furnace specifications and temperature control, and heat radiation. Solve problems such as slow heating and temperature rise, achieve good technical application and market prospects, improve welding quality, and uniform temperature rise

Pending Publication Date: 2022-07-01
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The heating device is used for preheating, the operation is complicated, and the device cost is high;
[0005] (2) Thermal radiation heating is slow in temperature rise and low in efficiency;
[0006] (3) The thermal conductivity of titanium alloy is low, and the thick plate is easy to be heated unevenly, which affects the welding quality
[0008] (1) Ultrasonic vibration is used for stress relief, the efficiency is low, the degree of stress relief between the surface of the thick plate and the center is inconsistent, and it is easy to form a stress gradient;
[0009] (2) Heat treatment is used to eliminate the stress, and the welding structure needs to be put into the heating furnace for heat treatment. The requirements for the specification and temperature control of the heating furnace are high, and the operation is complicated and the cost is high.

Method used

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  • Pulse current auxiliary type pre-welding preheating and post-welding stress relief method for high-strength titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0044] A pulse current-assisted method for pre-welding preheating and post-welding elimination of high-strength titanium alloy, comprising the following steps:

[0045] 1) The size of the titanium alloy test plate to be welded is 100×50×10mm, and the groove width is 12mm;

[0046] 2) Clean the groove area of ​​the titanium alloy test plate, and use a carbide grinding head to grind the groove area to remove the oxide scale;

[0047] 3), use tin foil to cover the titanium alloy test plate treated in step 2), and then continue to inject argon gas with a purity of 99.99%;

[0048] 4) Under the condition of continuous protection of argon gas, use a steel fixture to connect the titanium alloy test plate coated in step 3) with the pulse power supply equipment, turn on the pulse power supply equipment, and set the pulse current frequency to 300Hz , the pulse width is 50μs, the current is 20000A, the sample preheating temperature is 500℃, and the energization time is 2min;

[0049]5)...

Embodiment 2

[0054] A pulse current-assisted method for pre-welding preheating and post-welding elimination of high-strength titanium alloy, comprising the following steps:

[0055] 1) The size of the titanium alloy test plate to be welded is 100×50×15mm, and the groove width is 12mm;

[0056] 2) Clean the groove area of ​​the titanium alloy test plate, and use a carbide grinding head to grind the groove area to remove the oxide scale;

[0057] 3), use tin foil to cover the titanium alloy test plate treated in step 2), and then continue to inject argon gas with a purity of 99.99%;

[0058] 4) Under the condition of continuous protection of argon gas, use a steel fixture to connect the titanium alloy test plate coated in step 3) with the pulse power supply equipment, turn on the pulse power supply equipment, and set the pulse current frequency to 1000 Hz, the pulse width is 100μs, the current is 18000A, the sample preheating temperature is 550℃, and the energization time is 3min;

[0059]...

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Abstract

The invention relates to a pulse current auxiliary type high-strength titanium alloy pre-welding preheating and post-welding stress relief method, which aims at the material characteristics of high-strength titanium alloy, adopts a pulse current rapid synchronous heating mode, can rapidly, efficiently and stably realize the temperature rise of a pre-welding metal piece and the stress relief of a post-welding welding area, and has the characteristics of simple operation, low cost and the like. The method has the advantages of uniform temperature rise of materials, high efficiency, low cost and the like, the heating efficiency is improved to a certain extent, the welding cracking defect of the high-strength titanium alloy is reduced, the post-welding residual stress is reduced, the welding quality is obviously improved, and the method has good technical application and market prospects in the fields of ship and ocean engineering titanium alloy equipment and the like.

Description

technical field [0001] The invention relates to the technical field of titanium alloy welding, in particular to a pulse current-assisted high-strength titanium alloy preheating method before welding and post-welding elimination. Background technique [0002] Titanium alloy has high specific strength, good corrosion resistance, especially seawater corrosion resistance, and is the preferred material for pressure-resistant structures of deep-sea equipment. The high-strength titanium alloy with a yield strength of more than 1000MPa is used to prepare a pressure-resistant spherical shell, which has been applied to the 10,000-meter manned submersible independently developed by my country. However, high-strength titanium alloys have poor welding crack resistance, and are prone to cracking at room temperature. The material needs to be preheated before welding, and heat treatment or ultrasonic vibration is usually required to eliminate welding residual stress after welding. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/32C21D1/40C21D9/50C22F1/02C22F1/18
CPCB23K9/167B23K9/235B23K9/32C21D9/50C22F1/183C22F1/02C21D1/40
Inventor 吴晓飞张帅锋吕逸帆
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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