Middle and small power laser GMA electrical arc compound welding method appending with mechanical force

A hybrid welding, -GMA technology, applied in the field of laser-GMA arc hybrid welding

Inactive Publication Date: 2011-02-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of large droplet size, long droplet transition time and keyhole effect of droplet damage laser welding in the existing laser-GMA arc hybrid welding method Problem, the present invention provides a kind of medium and small power laser-GMA arc hybrid welding method with additional mechanical force

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  • Middle and small power laser GMA electrical arc compound welding method appending with mechanical force
  • Middle and small power laser GMA electrical arc compound welding method appending with mechanical force
  • Middle and small power laser GMA electrical arc compound welding method appending with mechanical force

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specific Embodiment approach 1

[0013] Specific embodiment 1. The medium and low power laser-GMA arc hybrid welding method with additional mechanical force of this embodiment is to apply additional mechanical force to the droplet along the axis of the GMA wire in the existing medium and low power laser-GMA arc hybrid welding process. Promote the droplet transition in advance.

[0014] The additional mechanical force of this embodiment can be applied when the droplet of the hybrid welding grows to a certain extent, that is, before the droplet of the hybrid welding shifts to the direction of the laser beam. In this embodiment, it can be between 0.7T and 0.95T. Mechanical force is applied between them to achieve the purpose of prompting the droplet to achieve transition in advance. The period T is the same as the droplet transfer period of the existing single GMA arc welding under the same conditions, and it is determined according to the arc current during welding and the material and diameter of the welding wire...

specific Embodiment approach 2

[0016] The second embodiment is that the difference between this embodiment and the medium and low power laser-GMA arc hybrid welding method with additional mechanical force described in the first embodiment is that the additional mechanical force is generated by increasing the shielding gas flow of the GMA arc welding gun of.

[0017] In this embodiment, the shielding gas flow rate of the GMA arc welding gun is used to apply mechanical force to the droplets. During normal welding, the shielding gas flow rate of the GMA arc welding gun is 10-25 liters / minute commonly used in the prior art. When it grows up to a certain extent, that is, before the composite welding droplet shifts to the direction of the laser beam, that is, between 0.75T and 0.85T of the droplet transition, the shielding gas flow rate is increased to 40-100 liters instantly / Min, so that the droplet transitions in advance under the action of the protective gas.

[0018] This embodiment can use CO 2 Or YAG laser and...

specific Embodiment approach 3

[0024] Specific embodiment three. The difference between this embodiment and the medium and low power laser-GMA arc hybrid welding method with additional mechanical force described in the first embodiment is that the additional mechanical force is used to control the wire feeding speed of the GMA arc welding gun in the cycle It is realized by a pulsating change in T, the starting time t of the pulsating change 2 It is between 0.7T and 0.8T of the droplet transition.

[0025] The pulsation change described in this embodiment means that the wire feeding speed changes in a sawtooth waveform, a triangular waveform or a sine waveform within the period T with time, wherein the acceleration time period of the wire feeding is t a 0.15T~0.25T, the deceleration time period of wire feeding t d It is 0.05T~0.15T.

[0026] In this embodiment, pulsating wire feeding is used to add mechanical force. In the laser-GMA arc hybrid welding process, pulse wire feeding is used to apply a certain amount ...

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Abstract

A middle-small power laser-GMA arc compound welding method with additional mechanical force relates to a laser-GMA arc compound welding method which solves the problems of large fused drop dimension, long transferring time of the fused drop, damages on the lockhole effect of laser welding by the fused drop exited in the exiting laser-GMA arc compound welding method. The compound welding method ofthe invention applies a mechanical force on the fused drop along the axis direction of a GMA welding wire to promote the fused drop to realize transferring in advance when the compound welded fused drop grows to a certain degree, namely before the compound welded fused drop drops to the direction of a laser beam to deviate during the existing laser-GMA arc compound welding method. The invention has the advantages of improving the penetration of the welding line and acquiring continuous welding forming; reducing the laser power and a welding current; thereby reducing the welding deformation; improving the operating factor of energy and welding efficiency as well as reducing the manufacture cost. The invention is suitable for any middle-small power laser-GMA arc compound welding method.

Description

technical field [0001] The invention relates to a laser-GMA arc hybrid welding method. Background technique [0002] Previous research work has shown that whether it is laser-GMA or laser-TIG composite, it is a consensus that composite heat source welding can effectively increase penetration, improve welding speed and welding adaptability. Especially in recent years, in pursuit of greater welding penetration and welding of large and thick plates, more attention has been focused on laser-GMA composite heat source welding. [0003] In 2000, Fraunhofer ILT successfully applied the laser-GMA arc hybrid welding technology to the mass production of 5-8mm thick oil storage tank wall welding for the first time. At present, the maximum plate thickness of 15mm thick S3555NL steel can be formed by laser-MIG arc hybrid welding once penetration forming, and the laser used is TLF20000 of 20kW. However, due to the problem of droplet transfer in laser and GMA composite welding, the contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K28/02B23K9/095B23K26/348
Inventor 陈彦宾雷正龙李俐群
Owner HARBIN INST OF TECH
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