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Necking detection control method in consumable electrode electric arc welding

A consumable electrode and arc welding technology, which is applied in the necking detection and control field of consumable electrode arc welding, can solve the problems such as the inability to properly adjust the necking detection reference value and reduce the sensitivity, so as to increase the suppression of spatter generation, reduce the sensitivity, The effect of increasing sensitivity

Active Publication Date: 2012-11-28
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the invention of Patent Document 3, when the constriction detection time Tn is greater than the upper limit time (when the sensitivity is too high), the sensitivity is reduced by increasing the constriction detection reference value Vtn, thereby achieving optimization.
However, in the invention of Patent Document 3, when the constriction detection time Tn is short (when the sensitivity is too low), the constriction detection reference value Vtn cannot be optimized.

Method used

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  • Necking detection control method in consumable electrode electric arc welding
  • Necking detection control method in consumable electrode electric arc welding
  • Necking detection control method in consumable electrode electric arc welding

Examples

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Embodiment approach 1

[0042] In the constriction detection control method according to Embodiment 1 of the present invention, the constriction detection time Tn is detected every short circuit, and when the constriction detection time Tn is equal to or less than the lower limit time Lt, the constriction detection time Tn is subtracted from the counter value Cn. 1. When the constriction detection time Tn is greater than the upper limit time Ht, 1 is added to the counter value Cn, and when the counter value reaches the negative reference value Lc, the constriction detection reference value Vtn is decreased by the decrease value Δd, And reset the counter value Cn to 0, when the counter value Cn reaches the positive reference value Hc, increase the constriction detection reference value Vtn by the increment value Δu, reset the counter value Cn to 0, and continue welding Correction of the aforementioned constriction detection reference value Vtn. Hereinafter, Embodiment 1 will be described.

[0043] ...

Embodiment approach 2

[0056] In the constriction detection control method according to Embodiment 2 of the present invention, the above-mentioned decrease value Δd is set based on the negative reference value from the time when the above-mentioned counter value Cn is reset to 0 until reaching the above-mentioned negative reference value Lc. The arrival time Td is changed, and the above-mentioned increment value Δu is changed according to the positive reference value arrival time Tu from the time when the above-mentioned counter value Cn is reset to 0 to the above-mentioned positive reference value Hc. Hereinafter, Embodiment 2 will be described.

[0057] figure 2 It is a block diagram of a welding device for carrying out the constriction detection control method of consumable electrode arc welding according to the second embodiment. Should figure 2 with the above Image 6 and figure 1 Correspondingly, the same code is given to the same block, and these explanations are omitted. figure 2 is...

Embodiment approach 3

[0064] In the constriction detection control method according to the third embodiment of the present invention, in addition to the above-mentioned first and second embodiments, the constriction occurs within a predetermined period Ti from the time point when the previous short circuit was opened and the arc regenerated. In the event of a short circuit, the counter value Cn is not increased or decreased based on the constriction detection time Tn of the short circuit. Hereinafter, Embodiment 3 will be described.

[0065] Figure 4 It is a block diagram of a welding device for implementing the constriction detection control method of consumable electrode arc welding according to Embodiment 3 of the present invention. Should Figure 4 and Image 6 and figure 1 Correspondingly, the same code is given to the same block, and these explanations are omitted. Figure 4 is: in figure 1 The short circuit / arc discrimination circuit SA and the double short circuit discrimination ci...

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Abstract

The invention provides a necking detection control method in the consumable electrode electric arc welding. In the consumable electrode electric arc welding, the molten drop necking detection precision can be improved. The necking of the molten drop is carried out through making the change of the resistance between a consumable electrode (1) and a base metal (2) reach to a necking detection reference value, and if the necking phenomenon is detected, the output control is carried out through reducing the welding current Iw and generating the arc in a low current state. In each short circuit, the necking detection time from the necking phenomenon detection time to the arc regeneration time is detected. When the necking detection time is below a lower limit time, 1 is subtracted from a counter, and when the necking detection time is above an upper limit time, 1 is added into a counter. When the value of the counter reaches to a negative reference value, the necking detection reference value Vtn is reduced, and when the value of the counter reaches to a positive reference value, the necking detection reference value Vtn is added. In such a manner, the necking detection reference value Vtn becomes proper, and the necking detection precision is improved.

Description

technical field [0001] The present invention relates to a necking detection and control method of consumable electrode arc welding for detecting the necking phenomenon of droplet during short circuit so as to reduce welding current and improve welding quality. Background technique [0002] Figure 5 It is a diagram showing current-voltage waveforms and droplet transfer in consumable electrode arc welding in which short-circuit period Ts and arc period Ta are repeated. Figure 5 (A) shows the time change of the welding current Iw that energizes the consumable electrode (hereinafter referred to as welding wire 1), Figure 5 (B) shows the time change of the welding voltage Vw applied between the welding wire 1 and the base metal 2, Figure 5 (C) to (E) show the transition state of the droplet 1a. Below, refer to Figure 5 Be explained. [0003] During the short-circuit period Ts from time t1 to t3, the droplet 1a at the tip of the welding wire 1 is short-circuited with the base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/095
Inventor 井手章博
Owner DAIHEN CORP
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