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Welding control circuit and AC welding power supply

A technology for controlling circuits and welding power sources, applied in welding equipment, converting AC power input to AC power output, electrical components, etc., and can solve problems such as droplet splashing

Active Publication Date: 2020-07-07
HANGZHOU KAIERDA ELECTRIC WELDING MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a welding control circuit and a welding power supply that can greatly reduce the splashing of molten droplets in order to overcome the serious problem of welding droplet splashing in the existing electrode-consumable type.

Method used

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  • Welding control circuit and AC welding power supply
  • Welding control circuit and AC welding power supply
  • Welding control circuit and AC welding power supply

Examples

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Effect test

Embodiment 1

[0030] In the conventional consumable electrode type welding equipment, a short circuit occurs when the electrode comes into contact with the workpiece, at which time the voltage drops and the current rapidly increases. The huge welding current makes a lot of spatter when the liquid bridge is fused. In view of this, the present embodiment provides a welding control circuit that can greatly suppress the spatter generated when the liquid bridge is blown.

[0031] Such as figure 1 As shown, the welding control circuit provided by this embodiment includes an input main circuit 10 , an inverter circuit 20 , a current switching component 30 and a freewheeling blocking component 40 . The current switching assembly 30 is connected to the input main circuit 10 to adjust the output current of the inverter circuit 20, the current switching assembly 30 is configured to have at least a first working state and a second working state; during the short circuit, when the detected electrical p...

Embodiment 2

[0054] This embodiment is basically the same as Embodiment 1 and its variations, the difference is that: Image 6 As shown, the auxiliary circuit 50 includes a constant current source 53 connected to the energy storage inductor L1 , and the constant current source 53 provides an auxiliary current for the auxiliary circuit that is smaller than the average current input to the main circuit 10 .

[0055] Similarly, the setting of the constant current source 53 makes a small current flow through the auxiliary circuit 50 during the non-pulse base period, and the inductance generated by the small current on the energy storage inductance L1 will not affect the characteristics of the welding current pulse. During the pulse base period, the inductance generated by the small current on the energy storage inductor L1 effectively reduces the ripple of the base current.

[0056] To sum up, the welding control circuit and the current switching component connected in series in the input main...

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PUM

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Abstract

The invention provides a welding control circuit and an AC welding power source, which is suitable for a consumable electrode type AC welding power source, and includes an input main circuit, an inverter circuit, a current switching component and a freewheeling blocking component. The current switching component is connected to the input main circuit to adjust the output current of the inverter circuit, and the current switching component is configured to have at least a first working state and a second working state; during the short circuit, when the detected electrical parameter indicates that the liquid bridge is about to When disconnected, the current switching component switches from the first working state to the second working state to reduce the output current of the inverter circuit. The freewheeling blocking component is connected to the four IGBT tubes on the inverter circuit, and blocks the freewheeling circuits of the four IGBT tubes when the current switching component is in the second working state.

Description

technical field [0001] The invention relates to the field of welding, and in particular to a welding control circuit and an AC welding power supply. Background technique [0002] MIG welding is a welding method that uses a meltable wire as an electrode and uses the arc that burns between the continuously fed wire and the workpiece to be welded as a heat source to melt the wire and the base metal. A consumable electrode welding method. During the welding process, the shielding gas is continuously delivered to the welding zone through the torch nozzle, so that the arc, the molten pool and the surrounding base metal are protected from the harmful effects of the surrounding air. The continuous melting of the welding wire should transition into the weld pool in the form of droplets, fuse with the molten parent metal, and form the weld metal after condensation. [0003] In the consumable electrode welding method, the power supply is connected between the electrode (welding wire)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/10B23K9/173H02M5/458
CPCB23K9/1043B23K9/173H02M5/458
Inventor 吴勇健侯润石何贤挺
Owner HANGZHOU KAIERDA ELECTRIC WELDING MACHINE
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