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Electrode fused arc welding machine

A technology for arc welding machines and melting electrodes, which is applied to arc welding equipment, welding equipment, manufacturing tools, etc., which can solve the problems of limiting arc ignition performance and insufficient rise of starting current, so as to improve arc ignition performance and prevent arc Effect of cutting off and reducing surge voltage

Active Publication Date: 2007-09-19
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if a thyristor element is used, only the intermediate terminal of the reactor and the output terminal are short-circuited, and the rise of the starting current cannot be said to be sufficient due to the influence of the inductance value between the input terminal and the intermediate terminal of the reactor that is not short-circuited. , limiting the improvement in arc striking performance

Method used

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  • Electrode fused arc welding machine
  • Electrode fused arc welding machine
  • Electrode fused arc welding machine

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Experimental program
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Effect test

Embodiment approach 1

[0038] FIG. 1 is an electrical connection diagram of a fusion electrode type arc welding machine according to Embodiment 1 of the present invention. In this figure, components with the same symbols as those in the electric connection diagram of the conventional fusion electrode type arc welding machine shown in FIG. .

[0039] In the electrical connection diagram of the melting electrode type arc welding machine shown in Fig. 1, the arc starting circuit ST is formed by a switching element (such as an IGBT) TR and a diode D1, and the input terminal of the reactor DCL is connected to the drain side of the switching element TR , the output terminal is connected to the cathode side of the diode D1. In addition, since the withstand voltage of the reverse voltage of the switching element (IGBT) is low, the protection diode D2 is generally provided inside the module. The reactor DCL is short-circuited or released only by the switching element TR, and the energy charged to the react...

Embodiment approach 2

[0055] FIG. 4 is a detailed diagram of the second arc ignition control circuit SE2 related to Embodiment 2. In this figure, components with the same symbols as those of the arc ignition control circuit SE of Embodiment 1 shown in FIG. 2 perform the same operations, and therefore are omitted. Instructions, only the structural components with different symbols are explained.

[0056] The second arc striking control circuit SE2 shown in Fig. 4 is composed of a flip-flop circuit FF, a current comparison circuit IC, a reference current setting circuit IRF, a second flip-flop circuit FF2, a second current comparison circuit IC2, a second reference current A setting circuit IRF2 and an OR logic circuit OR are formed.

[0057] The second current comparison circuit IC2 compares the predetermined reference current setting value Irf2 with the welding current detection signal Id, and if it is higher than the second reference current setting value Irf2, the second current comparison signal...

Embodiment approach 3

[0071] Fig. 6 is an electrical connection diagram of a melting electrode arc welding machine performing AC pulse MIG welding. In this figure, components with the same symbols as those in the electrical connection diagram of the fusion electrode arc welding machine according to Embodiment 1 of the present invention shown in FIG.

[0072] The secondary-side inverter circuit INV2 shown in Fig. 6 is installed on the output side of the reactor DCL, so that the output that passes through the secondary rectification circuit DR2 and the reactor DCL is smoothed to a DC output with a low frequency (for example, 50 to 200 Hz) necessary for the AC pulse MIG ) work to generate an AC arc.

[0073] The circuit configurations other than the secondary-side inverter circuit INV2 shown above are the same as those of the electric connection diagram configuration of the fusion electrode type arc welding machine according to Embodiment 1 shown in FIG. 1 . Therefore, the mechanism of the present in...

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Abstract

A melting electrode type arc welding machine, which supplies an output between a consumable electrode and an object to be welded through a reactor provided in an output path in a welding power source, the above melting electrode type arc welding machine is equipped with: an arc ignition circuit, which is connected in series The source side of the switching element and the anode side of the diode are connected, the input terminal of the reactor is connected to the drain side of the switching element, and the output terminal of the reactor is connected to the cathode side of the diode; and an arc ignition control circuit, which is inputted When the welding start signal is turned on, the switching element is turned on, and the starting current of a large current is passed between the molten electrode and the object to be welded for a predetermined time. Then, when the energization of the starting current is completed, it transitions to the initial current of a small current. When the initial current flows, the switching element is turned off. Therefore, even if the inductance of the reactor provided in the output path in the welding power source is a large value, the arc ignition performance can be improved.

Description

technical field [0001] The present invention relates to a fusing electrode type arc welding machine, and more particularly to a fusing electrode type arc welding machine which improves arc ignition performance at the start of welding. Background technique [0002] The arc ignition of the arc welding machine using the melting electrode generates a small arc while the melting electrode is in contact with the object to be welded, and the small arc grows and transfers to a stable welding arc. At this time, in order to perform arc ignition smoothly, it is necessary to make the rising speed of the starting current at the time of arc ignition very fast. [0003] Fig. 7 is an electrical connection diagram of a conventional molten electrode arc welding machine with improved arc ignition. In this figure, the AC power source AC adopts a single-phase commercial AC power supply or a three-phase commercial AC power supply. The primary rectification current DR1 converts the AC voltage fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/067B23K9/095B23K9/173
Inventor 西坂大志渡谷哲治
Owner DAIHEN CORP
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