Method for improving laser transmission welding connection strength

A technology of laser transmission welding and connection strength, which is applied in the field of laser transmission welding, can solve problems such as weld damage, achieve local connection firmness, and improve the effect of connection strength

Inactive Publication Date: 2013-04-24
JIANGSU UNIV
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Problems solved by technology

The document "The Effect of Laser Shock Surface Strengthening on the Mechanical Properties of Welded Joints" describes a method for surface strengthening treatment of welded joints to improve tensile strength. This method is to improve the strength of welded connections after welding. In transmission welding Inevitably cause damage to the weld seam after welding

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  • Method for improving laser transmission welding connection strength
  • Method for improving laser transmission welding connection strength
  • Method for improving laser transmission welding connection strength

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Embodiment Construction

[0017] Below in conjunction with specific embodiment the present invention is further described, weld transparent nylon and 304 stainless steel metals with the present invention.

[0018] Welding preparation: The selected welding transparent light-transmitting material nylon 13 has a size of 10x10x2mm, and the light-absorbing material 304 stainless steel 15 has a size of 10x10x0.6mm. The laser used to form pits on the metal surface is a pulse laser with a maximum average power of 250w and a maximum energy of 60J. The width is 1.064um, and the laser transmission welding laser adopts a semiconductor laser generator 7 with continuous energy, the maximum power is 130w, and the wavelength is 980nm±10nm.

[0019] Surface treatment of weldment: Ultrasonic cleaning the sample 304 stainless steel 15 with ethanol to remove surface impurities, put it on the pulse laser workbench, and process it according to the welding area position of the actual material, parameters: voltage 490V, defocu...

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Abstract

The invention discloses a method for improving laser transmission welding connection strength, belonging to the field of laser transmission welding technology, and especially refers to laser transmission welding of metals and polymers. The method comprises pulsed laser treatment is performed to the surface of a metal material which needs welding to form pits on the surface; during the welding, the metal treated by pulsed laser is used as a lower layer light-absorbing material, and the polymer is used as a top layer light transmitting material, by adopting an overlapping connection type, a restrained layer is used for clamping tightly and the welding pressure is applied; a semiconductor laser with continuous energy is used for laser transmission welding to make a surface temperature quickly reaches the melting point of the top layer polymer, so the polymer surface is melted; because pits are formed on the lower metal surface after pulsed laser treatment, the melted polymer on the top surface flows into the pits by the action of the welding pressure to form an engaging interface with a riveting structure at a welding line, thereby improving laser transmission welding connection strength.

Description

technical field [0001] The invention belongs to the technical field of laser transmission welding, in particular to a method and a device capable of improving the connection strength of metal and polymer laser transmission welding. The method of pulse laser treatment forms pits on the metal surface. During laser transmission welding, the molten polymer flows into the pits under the action of welding pressure, forming a riveting interface at the weld, increasing the metal and polymer. The connection contact area is large, so that the metal and the polymer can be better combined with each other, so as to improve the connection strength of laser transmission welding. Background technique [0002] At present, laser transmission welding technology is widely used in the field of welding processing of the same and dissimilar materials such as polymers and polymers, and polymers and metals. Its characteristics are: fast, non-contact, accurate, small heat-affected zone, etc. With th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C65/16B29C65/44
CPCB29C65/1616B29C65/1635B29C65/1654B29C65/44B29C65/8253B29C66/0246B29C66/1122B29C66/30325B29C66/41B29C66/43B29C66/742B29C66/81267B29C66/836B29C66/9221B29C66/9261B29C66/7392B29C66/71B29C66/74283B29C66/02B29C66/929B29C66/939B29C66/8122B29K2077/00B29K2909/08
Inventor 刘会霞赵振关陈浩黄创严长顾宇轩孟冬冬伍彦伟蔡野李品王霄
Owner JIANGSU UNIV
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