Arc-welding molten drop necking formation detection method and control method after necking formation

An arc welding and control method technology, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of misjudged welding energy distribution, no way to directly detect and control, poor and other problems, achieve compensation delay, avoid The effect of violent occurrence of electric explosion and avoiding misjudgment of necking

Active Publication Date: 2015-05-27
SHENZHEN MEGMEET ELECTRICAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing technology has no way to directly detect and control the energy in the short circuit to arc transition process, so it may cause misjudgment or poor welding energy distribution

Method used

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  • Arc-welding molten drop necking formation detection method and control method after necking formation
  • Arc-welding molten drop necking formation detection method and control method after necking formation
  • Arc-welding molten drop necking formation detection method and control method after necking formation

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Embodiment Construction

[0025] Figure 4 It is a block diagram of the present invention concerning detection and control of droplet necking in arc welding. The main circuit is controlled by DSP, which includes detection circuit, power calculation unit, current adjustment unit, voltage adjustment unit VR, power regulator PR, state switching circuit SW, current loop initial value setting unit Ia_init and multiplexer Mux.

[0026] The wire feeder of the welding machine feeds wire at a constant speed, detects the welding voltage Vw between the end of the welding wire and the workpiece through the voltage detection unit Vd, detects the welding current Iw flowing through the welding wire and the workpiece through the current detection unit Id, and samples the voltage and current The signal passes through the filter circuit to filter out the interference signals from the inside and outside of the welding system to obtain the welding voltage sampling signal Vs and welding current sampling signal Is. The ampl...

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Abstract

The invention discloses an arc-welding molten drop necking formation detection method and a control method after necking formation. The instantaneous power of welding and the variation rate of the instantaneous power of the welding are calculated through the real-time detection for welding current and welding voltage, and the necking is formed when the variation rate of the instantaneous power is more than a certain critical value. After the necking formation, the output instantaneous power is controlled to be the some critical value, so as to control the energy when in electric exploding. The arc-welding molten drop necking formation detection method has predictability and compensates the time delay of a detection circuit, so that a welding system can perform the timely action in the aspect of control, so as to avoid the violent electric exploding; meanwhile, due to the factor of the current, the erroneous judgment caused by the over-fast rising rate of the current can be avoided.

Description

[technical field] [0001] The invention relates to melting electrode gas shielded welding, in particular to a method for detecting the occurrence of droplet necking in arc welding and a control method after the occurrence of droplet necking. [Background technique] [0002] figure 1 Shown is a schematic diagram of the current, voltage and droplet transfer when the droplet transfer is in a short-circuit transition state during gas shielded metal welding. Among them, Ts represents the arc short circuit time, Ta represents the arc ignition time, Iw represents the instantaneous value of welding current, Vw represents the instantaneous value of welding voltage, Pw represents the instantaneous value of welding power, figure 1 (b) shows the droplet shape in a droplet transfer period. Refer below figure 1 Be explained. [0003] Time t1-t4 is the short-circuit transition period of the droplet, such as figure 1 As shown in (b), a droplet 2 gradually forms at the end of the welding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/095
Inventor 芦炜
Owner SHENZHEN MEGMEET ELECTRICAL CO LTD
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