Output control method for coating arc welding
An arc welding and output control technology, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of inability to cope with the external inductance value of the output cable, the output current drop, the response delay, etc., to suppress the arc becoming Instability, improved arc ignition, and improved judgment accuracy
Inactive Publication Date: 2012-09-05
DAIHEN CORP
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Problems solved by technology
[0017] However, when the output cable of the welding machine is further extended and clad arc welding is performed over 10 m, the gain set at the factory cannot cope with the increase in the external inductance value accompanying the extension of the output cable. At this time, due to the delay of the responsiveness of the feedback control, when the short-circuit current transitions to the arc current, the output current will drop and the arc will fail.
In order to solve this problem, the operator needs to readjust the gain of the feedback on site, which is very troublesome work
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Embodiment approach 2
[0110] In general, it is rare that the output cable of the welding machine is extremely short, for example, 1 m, and clad arc welding is performed. At this time, the inductance value of the output cable decreases, and when the covered electrode 1 and the workpiece 2 are short-circuited, a large pulsation occurs in the output current. In this state, when the covered electrode 1 is withdrawn from the workpiece 2 to generate an arc, the feedback response becomes faster with the feedback gain set at the factory, and a large oscillation occurs in the output current. When the arc occurs It takes time to converge the pulsation of the arc, and the arc becomes unstable, and there is a problem that the arc is interrupted after the arc is generated.
[0111] Regarding Embodiment 2 of the present invention for solving the above-mentioned disadvantages, the Figure 5 as well as Figure 6 Only operations that are different from Embodiment 1 will be described.
[0112] Figure 4 The show...
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The invention provides an output control method for coating arc welding, and the output control method is advantaged by good arc striking without being influenced by the length of an output cable of a welding machine. In the output control method, the output current value of a welding power supply is detected, error between the output current value and a predetermined output current setting value is calculated, the calculated error is amplified with a predetermined referential amplification rate to calculate an error amplification value, and output current of the welding power supply is controlled based on the error amplification value, the output control method is characterized in that, a pulsating quantity of the output current is calculated, when the pulsating quantity is smaller than the predetermined pulsating referential value, the referential amplification rate is increased to the predetermined value.
Description
technical field [0001] This invention relates to the output control method of the length variation of the output cable accompanying clad arc welding. Background technique [0002] In recent years, DC reactors have been miniaturized by using inverter circuits in cladding arc welding. When cladding arc welding is performed by extending the output cable of the welding machine, it cannot be ignored that the output cable is extended. The resulting increase in inductance causes a delay in response to the standard setting feedback gain, and when the arc is generated by withdrawing the clad electrode from the workpiece, arc ignition often fails due to the delay in feedback response. In order to suppress the failure of the arc ignition, the gain of the feedback is set to a large predetermined value to improve the responsiveness delay. [0003] Figure 7 It is an electrical connection diagram of a conventional arc welding machine. The main power supply circuit INV shown in this figur...
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IPC IPC(8): B23K9/095
Inventor 大西孝典藤井督士
Owner DAIHEN CORP