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Detection method of droplet necking in molten electrode arc welding

An arc welding and melting electrode technology, applied in the field of arc welding, can solve problems such as time delay, and achieve the effects of reducing welding spatter, good real-time and authenticity, and good welding arc dynamic characteristics

Active Publication Date: 2015-12-09
SHENZHEN MEGMEET ELECTRICAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the existing technology, the switching frequency of the inverter welding power supply is generally below 80kHz, so the filter time constant needs to be at least 50 microseconds
The usual switching process from short circuit to arcing and from arcing to short circuit is about 50 microseconds, so the judgment of short circuit and arcing has faced the possibility of delay before it starts

Method used

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  • Detection method of droplet necking in molten electrode arc welding
  • Detection method of droplet necking in molten electrode arc welding
  • Detection method of droplet necking in molten electrode arc welding

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Embodiment Construction

[0020] Such as Figure 6 shown. In the molten electrode welding process based on the inverter power supply, when the droplet short-circuits and the short-circuit process ends and returns to the arc, the time constant of the system will change suddenly, so the slope of the welding current will change suddenly at this moment.

[0021] Such as Figure 7 As shown, the embodiment of the present invention takes the digital signal processor (DSP) as the core, samples the welding current through the A / D unit, calculates the slope of the welding current, and compares the slope with the short circuit threshold or the arcing judgment threshold, as a reverse short circuit and arcing status flags. Among them, in order to improve the real-time performance of the judgment process, the process of sampling the welding current by the digital signal processor is repeatedly sampled, that is, the welding current is sampled multiple times within one switching cycle.

[0022] Figure 7 It is a b...

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Abstract

The invention discloses a consumable electrode electric arc welding droplet necking detection method. When welding short circuit and arcing need to be judged in a consumable electrode welding system based on an inverter power supply, sampling is conducted on an output current of the inverted power supply, the variable slope of the output current is calculated, the variable slope of the output current is compared with a short circuit threshold value and an arcing threshold value respectively, and the result is used as a judging criterion about whether short circuit and arcing occur or not. According to the consumable electrode electric arc welding droplet necking detection method, necking judgment real-time performance and authenticity are good, welding forming can be improved, welding spatter can be reduced, and good welding arc dynamic characteristics can be achieved.

Description

[technical field] [0001] The invention relates to arc welding, in particular to a method for detecting droplet necking in molten electrode arc welding. [Background technique] [0002] The structure of traditional melting electrode arc welding device is as follows: figure 1 shown. The output characteristic of the welding power supply WPS is a constant voltage characteristic, which provides energy for the welding wire 1 , the arc 2 and the base material 3 to melt the welding wire 1 , maintain the arc 2 and heat the base material 3 . The welding wire 1 is fed at a constant speed through the wire feeding device 4, and the feeding speed of the welding wire 1 should be consistent with the melting speed of the welding wire to ensure a stable welding process. [0003] Such as figure 2 As shown, when the melting electrode arc welding is at a low wire feeding speed, in order to ensure the welding quality, the droplet is often in a short-circuit transition state, that is, short-cir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/10
CPCB23K9/0671B23K9/0953B23K9/173
Inventor 芦炜
Owner SHENZHEN MEGMEET ELECTRICAL CO LTD
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