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Steel tube welding head heat treatment method

A heat treatment method and welding head technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as performance improvement limitations, and achieve the effects of improving mechanical properties and toughness, high engineering application value, and reducing production costs.

Inactive Publication Date: 2018-02-13
湖州正德轻工机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional heat treatment process is relatively simple and has limitations in performance improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The present invention will be further described below in conjunction with the examples, but not as a basis for limiting the present invention.

[0010] Example. A heat treatment method for steel pipe welded joints, characterized in that: the following steps are carried out:

[0011] ①Put the welding head of the steel pipe into the vacuum heat treatment furnace and raise the temperature to 950~1000℃ with the furnace, and keep it warm for 1~2h;

[0012] ② Cool the welded steel pipe welding head to 370-380°C for the first time, heat the steel pipe welding head after the first cooling to 850-855°C, and then cool it to 250-260°C for the second time, keep it warm for 2-3 hours, and then air cool to room temperature.

[0013] The vacuum working pressure range in the vacuum heat treatment furnace is 6.0×10 -2 Pa-6.5×10 -2 Pa.

[0014] The invention obtains a welded joint with stable use and better performance by optimizing the process steps and parameters of each stage. T...

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Abstract

The invention discloses a steel tube welding head heat treatment method which is characterized by including the steps: (1) placing a steel tube welding head into a vacuum heat treatment furnace, heating the steel tube welding head to reach the temperature of 950-1000 DEG C, and keeping the temperature for 1-2 hours; (2) performing primary cooling on the welded steel tube welding head to reach thetemperature of 370-380 DEG C, heating the cooled steel tube welding head to reach the temperature of 850-855 DEG C, performing secondary cooling on the steel tube welding head to reach the temperatureof 250-260 DEG C, keeping the temperature for 2-3 hours, and performing air cooling on the welding head to reach indoor temperature.

Description

technical field [0001] The invention relates to a steel pipe welding joint, in particular to a heat treatment method for a steel pipe welding joint. Background technique [0002] The alloy has good welding performance, and can be welded by electron beam welding, laser welding, diffusion welding, linear friction welding, argon arc welding and other methods, and the strength of the welded joint after welding can meet the required requirements. However, in order to eliminate the post-weld residual stress that is unfavorable for fatigue and corrosion resistance, it is necessary to perform post-weld heat treatment on the welded joint. Optimizing the heat treatment process after welding can make the welded joint after heat treatment basically maintain the same strength level as the welded joint before heat treatment. To a certain extent, the comprehensive performance of the welded joint is improved. However, the conventional heat treatment process is relatively simple and has lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50
CPCC21D9/50
Inventor 崔红伟
Owner 湖州正德轻工机械有限公司
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