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Necking checking and control method for melted electrode arc welding

A melting electrode and arc welding technology, which is applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problem of unstable control system and achieve the effect of stable control system

Active Publication Date: 2009-07-22
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve the above problems, if the Figure 8 The above-mentioned magnification Gain, the control system for the appropriateness of the necking detection reference value becomes unstable

Method used

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  • Necking checking and control method for melted electrode arc welding
  • Necking checking and control method for melted electrode arc welding
  • Necking checking and control method for melted electrode arc welding

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1 of the present invention is a detection and control method of constriction in molten electrode arc welding, wherein: detecting the constriction detection time in each short circuit, storing a given number m of constriction detection times Tn in the past from the current moment, When the number of stored constriction detection times Tn below the minimum value is greater than or equal to the minimum value, the constriction detection reference value Vtn is reduced by a preset reduction value ΔD, and each stored constriction detection time Tn is not less than the maximum value. When the number of objects is greater than or equal to the maximum value, the constriction detection reference value Vtn is increased by a preset increase value ΔU. Details of Example 1 are described below.

[0040] The block diagram of the welding power source used to implement the detection and control method of the constriction of the molten electrode arc welding in the first embodime...

Embodiment 2

[0047] The block diagram of the welding power source used to implement the detection and control method of the constriction of the molten electrode arc welding according to the second embodiment of the present invention is described in the above-mentioned Figure 5 , so that the necking detection control circuit ND is image 3 The block diagram shown. exist image 3 , for the above figure 1 The same blocks are given the same symbols, and their descriptions are omitted. The following instructions are compatible with figure 1 The different blocks are indicated by dotted lines.

[0048] The second constriction detection time group storage circuit MT2 takes the constriction detection signal nd as an input, detects the constriction detection time of each short circuit, stores constriction detection time groups with a given storage number m in the past from the current moment, and outputs the constriction detection time group. The neck detection time group stores the signal M...

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Abstract

The present invention is a method for detecting and controlling the necking of melting electrode arc welding. According to the change of the voltage value or resistance value between the melting electrode and the base metal, the necking detection reference value (Vtn) is reached, and the occurrence of the arc again from the short-circuit state is detected. The precursor phenomenon is the necking phenomenon of the droplet, which causes the welding current to decrease rapidly, among which: the necking detection time is detected in each short circuit, the storage (MT) is a given number of necking detection times from the current time, and each stored When the necking detection time (Mt) is less than or equal to the minimum value, when the number of items is greater than or equal to the minimum value, the necking detection reference value (Vtn) is decreased by the increase / decrease value (ΔF), and each necking detection time (Mt) is stored. When the number of objects greater than or equal to the maximum value is greater than or equal to the maximum number of objects, the necking detection reference value (Vtn) is increased by an increase / decrease value (ΔF) to optimize the detection reference value (Vtn). In the detection control method of the constriction of the molten electrode arc welding accompanied by a short circuit, the constriction detection accuracy is improved.

Description

technical field [0001] The invention relates to a necking detection and control method for molten electrode arc welding which detects the necking phenomenon of molten droplets during short circuit, reduces welding current sharply and improves welding quality. Background technique [0002] Figure 4 It is a graph showing the current, voltage waveform, and droplet transfer in molten electrode arc welding in which the short-circuit period Ts and the arc period Ta are repeated. Figure 4 (A) represents the time change of the welding current Iw energized to the melting electrode (hereinafter referred to as electrode 1), Figure 4 (B) shows the time change of the welding voltage Vw applied between the electrode 1 and the base metal 2, Figure 4 (C) to (E) show the state of transfer of the droplet 1a. Refer below Figure 4 Be explained. [0003] During the short-circuit period Ts from time t1 to t3, the droplet 1a at the top of the electrode 1 is in a short-circuit state with the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/06B23K9/10
Inventor 惠良哲生井手章博水取裕康
Owner DAIHEN CORP
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