Simultaneous cooling assisted connection method based on laser additive manufacturing

A connection method and laser additive technology, applied in the field of material processing engineering, can solve the problems of grain size growth, heat loss, joint performance degradation, etc., to achieve the effects of heat loss accumulation, avoiding oxidation, and improving mechanical properties

Inactive Publication Date: 2016-03-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is for materials with low thermal conductivity such as titanium alloy, carbon body stainless steel, martensitic stainless steel, etc., because the heat cannot be effectively dissipated during the connection process, resulting in the growth of the grain size and the joint Performance degradation and other issues, but provides a simultaneous cooling-assisted joining method based on laser additive manufacturing

Method used

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  • Simultaneous cooling assisted connection method based on laser additive manufacturing
  • Simultaneous cooling assisted connection method based on laser additive manufacturing
  • Simultaneous cooling assisted connection method based on laser additive manufacturing

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specific Embodiment approach 1

[0029] Specific implementation mode one: combine figure 1 Describe this embodiment, this embodiment is a synchronous cooling-assisted connection method based on laser additive manufacturing, which is carried out according to the following steps:

[0030] Cooling with a cooling medium (liquid nitrogen or inert gas) to achieve a simultaneous cooling-assisted joining technology based on laser additive manufacturing.

[0031] 1. Connect the cooling device 2 to the laser working head 1 to realize the common movement of the cooling device and the laser head, and the angle between the cooling device 2 and the laser working head 1 is 0°~90°, and the relative position is 10mm~100mm; Fix the cooling device 2 and the laser working head 1 on the robot, and realize the synchronous movement of the cooling device and the laser head by controlling the movement of the robot;

[0032] 2. The workpiece 3 to be connected is grooved, and the groove is processed into a V-shaped groove, and the sur...

specific Embodiment approach 2

[0038] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the laser emitting laser is a semiconductor laser, CO 2 laser, YAG solid-state laser or fiber laser. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0039] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the process parameters of step 4 are: the diameter of the laser spot is 1-5mm, the defocus is -5-+5mm, the laser power is 800-10000W, and the scanning The speed is 10-40mm / s, the powder diameter is 40-100μm, the powder feeding rate is 5-20g / min, the layer thickness is 1-5mm, the scanning distance is 1-4mm, the protective gas is an inert gas, and the protective gas flow rate is 8~30L / min; the cooling medium is liquid nitrogen or inert gas, and the cooling gas flow rate is 0.1~20l / min. Others are the same as in the first embodiment.

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Abstract

The invention relates to a simultaneous cooling assisted connection method based on laser additive manufacturing, and aims to solve the problems of an increase in the crystal grain size, a decrease in the connector performance, and the like caused by the fact that heat cannot be effectively dissipated when titanium alloy, carbon stainless steel, martensitic stainless steel and other materials being relatively low in heat conductivity are involved in connection processes based on a laser additive manufacturing method. According to the method, a cooling device is arranged for being combined with a laser welding machine and a welding powder feeder, so as to achieving a cooling process; heat accumulated in the welding process can be effectively dissipated, so as to refine crystal grains; the welding efficiency and the connector performance are improved; in order to solve the problem that an oxidation phenomenon is likely to occur in the welding process, the cooling process is performed according to a cooling method adopting liquid nitrogen, inert gas or the like, so that connector oxidation can be effectively avoided when a cooling effect is exerted.

Description

technical field [0001] The invention relates to a synchronous cooling-assisted connection technology based on laser additive manufacturing, which belongs to the field of material processing engineering. Background technique [0002] As we all know, in the process of material welding, especially when welding some materials with low thermal conductivity, such as titanium alloy, carbonitic stainless steel, martensitic stainless steel, etc., there is a problem that heat is not easy to dissipate, especially if fusion welding such as This problem is more likely to occur in arc welding, electron beam welding, plasma welding, laser welding and other methods. During the welding process, the base metal will undergo unsteady intense heating, which may easily cause the base metal to be overheated, deformed, and overheated during the joining process. Appearance defects such as burning will also cause defects such as thermal cracks and coarse grains inside the material, which will have a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/00B23K26/70
CPCB23K26/00
Inventor 雷正龙李鹏郭涛陈彦宾张恒泉陈曦
Owner HARBIN INST OF TECH
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