Necking detection and control method of melting electrode and electric arc welding

A melting electrode, arc welding technology, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of small suppression effect and unstable welding state, and achieve the improvement of suppression effect, stable welding state, and reduced sensitivity. Effect

Active Publication Date: 2011-11-09
DAIHEN CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the effect of suppressing the amount of sputtering is reduced, and the welding state may become unstable due to the constriction detection control.

Method used

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  • Necking detection and control method of melting electrode and electric arc welding
  • Necking detection and control method of melting electrode and electric arc welding
  • Necking detection and control method of melting electrode and electric arc welding

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Experimental program
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Embodiment approach 1

[0079] In the necking detection control method according to the first embodiment of the present invention, the necking detection time Tn is detected for each short circuit, and when the necking detection time Tn is equal to or less than the lower limit time Lt, the count value Cn is decremented by 1, and when When the upper limit time Ht is longer than the upper limit time Ht, 1 is added to the count value Cn, and when the count value reaches the negative reference value Lc, the necking detection reference value Vtn is decreased by the decrease value Δd, and the count value Cn is reset to 0. When the count value Cn When the positive reference value Hc is reached, the constriction detection reference value Vtn is increased by the increment value Δu, and the count value Cn is reset to 0, and the above-mentioned correction of the constriction detection reference value Vtn is continued during welding. Hereinafter, this Embodiment 1 will be described.

[0080] figure 1 It is a bl...

Embodiment approach 2

[0093] In the necking detection control method according to the second embodiment of the present invention, the decrease value Δd is made to correspond to the negative reference value arrival time Td from the time when the count value Cn is reset to 0 until the negative reference value Lc is reached. The above-mentioned increment value Δu is changed according to the positive reference value arrival time Tu from the time when the above-mentioned count value Cn is reset to 0 until the above-mentioned positive reference value Hc is reached. Hereinafter, the second embodiment will be described.

[0094] figure 2 It is a block diagram of the welding apparatus for implementing the necking detection control method of the fusion electrode arc welding of Embodiment 2. FIG. This figure is the same as the above Figure 5 as well as figure 1 Correspondingly, the same symbols are assigned to the same modules, and their descriptions are omitted. The figure is in figure 1 The referen...

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Abstract

The invention provides a necking detection and control method of melting electrode and electric arc welding in order to improve the detection precision of the necking during the melting of electrode and electric arc. The necking of droplets can be detected in a manner that the change of a resistance value between a melting electrode (1) and a base material (2) reaches to a necking detection reference value (Vtn). If necking is detected, the welding current is reduced, and output control can be conducted under the state of low current value, regenerating electric arc. The necking detection time is calculated from the detection time of the necking phenomenon to the regeneration of electric arc based on each short circuit. When the necking detection time is below a lower limit time, one is subtracted from a count value. When the necking detection time is above an upper limit time, one is added to the count value. When the count value reaches to a negative reference value, the necking detection reference value (Vtn) is reduced. When the count value reaches to a positive reference value, the necking detection reference value (Vtn) is increased. Accordingly, as the necking detection reference value (Vtn) can be appropriate, the detection precision of the necking can be improved.

Description

technical field [0001] The invention relates to a necking detection and control method for fusion electrode arc welding, which is used for detecting the necking phenomenon of droplets in a short-circuit period and reducing the welding current, thereby improving the welding quality. Background technique [0002] Figure 4 This is a diagram showing current and voltage waveforms and droplet transfer in molten electrode arc welding in which the short-circuit period Ts and the arc period Ta are repeated. The graph (A) shows the temporal change of the welding current Iw applied to the melting electrode (hereinafter, referred to as the welding wire 1 ), and the graph (B) shows the temporal change of the welding voltage Vw applied between the welding wire 1 and the base metal 2 , the figures (C) to (E) show the transition of the droplet 1a. Hereinafter, description will be given with reference to this figure. [0003] During the short-circuit period Ts from time t1 to t3, the drop...

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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