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Method for controlling generation of cold crack in welding process based on electromagnetic induction heating

An electromagnetic induction heating and welding process technology, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problems of difficult control of flame power, increase welding production process, change the surface state of weld seam, etc., and achieve high efficiency Control welding cold cracks, improve welding production efficiency, and reduce the effect of hardened structure

Inactive Publication Date: 2010-07-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the pre-weld preheating method used to prevent cold cracks in the existing welding process causes the weld seam and heat-affected zone crystal grains to become thicker, the metal toughness decreases, and the flame power is difficult to control in the post-weld heat treatment method. It is easy to cause surface overburning and change the surface state of the weld and increase the welding production process. A method based on electromagnetic induction heating to control the generation of cold cracks in the welding process is proposed.

Method used

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  • Method for controlling generation of cold crack in welding process based on electromagnetic induction heating
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  • Method for controlling generation of cold crack in welding process based on electromagnetic induction heating

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specific Embodiment approach 1

[0011] Specific implementation mode one: combine Figure 1-Figure 5 Description of this embodiment, the method of this embodiment is realized by the following steps: Step 1: Find the welding continuous cooling transition curve corresponding to the selected welding material; determine the austenite transformation temperature Ac 1 , martensite transformation temperature Ms, the longest time to form 100% martensite t 1 and the shortest time t to form 0% martensite 2 ;

[0012] Step 2: Determine the temperature field of the welding part of the workpiece to be welded; select a workpiece among the workpieces to be welded as the test piece, perform welding on the test piece, the welding process is consistent with the normal welding, and determine the quasi-stable temperature field of the test piece Ac 1 The distance between the points is L1, and the distance between the arc center on the center line of the weld and the point at the martensitic transformation temperature Ms behind ...

specific Embodiment approach 2

[0016] Specific implementation mode two: combination figure 2 Describe the present embodiment, the characteristic dimension of the electromagnetic induction coil 7 of the present embodiment is length, width and longitudinal tube spacing, and the length is L=V in the step 3 1 ·t 2 , the width is to cover the weld seam and the heat-affected zone, and the longitudinal tube spacing is 19-21mm. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0017] Specific implementation mode three: combination figure 2 The present embodiment will be described. The electromagnetic induction coil 7 of the present embodiment is made of copper material. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a method for controlling generation of a cold crack in the welding process based on electromagnetic induction heating, relating to a method for controlling generation of the cold crack in the welding process. The invention aims to solve the problems that a welding seam and crystal grains in a heat influence region become coarse and the metal toughness is lowered due to using a pre-welding pre-heating method for preventing generation of the cold crack and the problems of difficult control of flame power, easy surface overburning, welding seam surface state change and welding production procedure increase in a post-welding heat treatment method in the traditional welding process. The method comprises the following steps of searching a welding continuous cooling transformation curve corresponding to special welding materials; determining a workpiece to be welded; welding a temperature field on the surface; determining induction heating process parameters; welding frock; and implementing welding until welding finish. The invention is used for welding.

Description

technical field [0001] The invention relates to a method for realizing the control of cold crack generation in the welding process. Background technique [0002] Welding cold cracking is a common problem in the welding process, especially for thick plates and high-strength steels. During the welding manufacturing process of the welded structure, the problem of cold cracking is very prominent, which directly affects the production efficiency and safety of the structure performance. In the actual production process, in order to prevent cold cracks, pre-weld preheating method, post-weld heat treatment method or both are often used at present. The method of preheating before welding can reduce the welding stress caused by excessive temperature difference during welding, slow down the cooling rate, accelerate the diffusion and escape of hydrogen, and reduce the hardness of the superheated zone. However, in order to achieve the desired effect, sometimes preheating The temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K37/00C21D1/42
CPCY02P10/25
Inventor 刘雪松方洪渊徐达方坤杨建国
Owner HARBIN INST OF TECH
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