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Control of removing granules by continuous impulsive return voltage in moltening polaric gas protection arc welding

A control method and arc welding technology, applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of irrelevance, melting of the end of the welding wire, etc. Effect

Inactive Publication Date: 2007-09-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a control method for continuous pulse burn-back voltage deballing in MIGA welding, which solves the problem that the arc always exists on the end of the welding wire during the burn-back process. The melting problem, and the size of the continuous pulse voltage has nothing to do with the welding specification parameters, and the adaptability is strong

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. At the end of the welding stage, it enters the burn-back stage. At this time, the wire feeding system stops, but because the inertia welding wire does not stop feeding, it continues to feed the workpiece at the inertia wire feeding speed, that is, the burning wire feeding speed, and the inertia makes the welding wire feed. Proceed to contact with the workpiece. When the continuous pulse burn-back voltage occurs, the contact current between the welding wire and the workpiece suddenly increases, and the welding wire receives high-density energy and rapidly melts to produce a burst that separates the welding wire from the workpiece, and the arc disappears immediately or maintains the continuous pulse. The time during the cycle when the voltage is at its peak.

[0014] 2. After that, the arc is no longer generated before the second short circuit, and the welding wire stops melting, that is, the end of the welding wire is difficult to grow again, which serves the purpose o...

Embodiment 2

[0022] 1. At the end of the welding stage, it enters the burn-back stage. At this time, the wire feeding system stops, but because the inertia welding wire does not stop feeding, it continues to feed the workpiece at the inertia wire feeding speed, that is, the burning wire feeding speed, and the inertia makes the welding wire feed. Proceed to contact with the workpiece. When the continuous pulse burn-back voltage occurs, the contact current between the welding wire and the workpiece suddenly increases, and the welding wire receives high-density energy and rapidly melts to produce a burst that separates the welding wire from the workpiece, and the arc disappears immediately or maintains the continuous pulse. The time during the cycle when the voltage is at its peak.

[0023] 2. After that, the arc is no longer generated before the second short circuit, and the welding wire stops melting, that is, the end of the welding wire is difficult to grow again, which serves the purpose o...

Embodiment 3

[0031] 1. At the end of the welding stage, it enters the burn-back stage. At this time, the wire feeding system stops, but because the inertia welding wire does not stop feeding, it continues to feed the workpiece at the inertia wire feeding speed, that is, the burning wire feeding speed, and the inertia makes the welding wire feed. Proceed to contact with the workpiece. When the continuous pulse burn-back voltage occurs, the contact current between the welding wire and the workpiece suddenly increases, and the welding wire receives high-density energy and rapidly melts to produce a burst that separates the welding wire from the workpiece, and the arc disappears immediately or maintains the continuous pulse. The time during the cycle when the voltage is at its peak.

[0032] 2. After that, the arc is no longer generated before the second short circuit, and the welding wire stops melting, that is, the end of the welding wire is difficult to grow again, which serves the purpose o...

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Abstract

A control method for removing small ball by continuous pulse burn-back in the electrode-consumable gas-arc welding is disclosed. A welding stage is followed by a burn-back stage. When the welding wire feeding system is stopped, the welding wire is still fed under the action of inertia until it is in contact with the workpiece. At this time, the continuous burn-back voltage pulses are applied to the welding wire to smelt it for separating it from the workpiece until the wire feeding speed is equal to zero, so removing the small ball from workpiece.

Description

technical field [0001] The invention relates to a method in the technical field of welding, in particular, to a control method for continuous pulse burn-back voltage de-balling in MGA arc welding. Background technique [0002] At the end of the welding process, the wire feeding system stops, but due to the action of inertia, the welding wire continues to be fed to the workpiece, causing the welding wire to stick to the workpiece. In the burn-back stage, the end of the welding wire melts due to the existence of the arc, and retracts into a spherical shape under the action of surface tension. At the end of the welding, there is a small ball at the end of the welding wire, which affects the success rate of the next welding arc. [0003] After searching the existing technical documents, it was found that Han Debin wrote an article "Improving the success rate of one-time arc ignition of the welding machine" in "Northeast Electric Power Technology" 1994 (8), in the article, the op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/10B23K9/173
Inventor 华学明吴毅雄张勇李铸国蔡艳胡永强
Owner SHANGHAI JIAO TONG UNIV
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