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Gas metal arc welding method and system

A melting gas and shielded welding technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as energy fluctuations, achieve the effects of suppressing fluctuations, significant effects, and stable welding processes

Inactive Publication Date: 2013-01-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The arc length adjustment process of the traditional flat characteristic power supply relies on the adjustment of the total energy of the arc, which inevitably produces energy fluctuations

Method used

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  • Gas metal arc welding method and system
  • Gas metal arc welding method and system
  • Gas metal arc welding method and system

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing description and specific embodiment, the present invention is described in further detail:

[0025] Such as figure 1 Shown is the schematic diagram of the main circuit of the present invention. BUCK circuit A includes switch tube Q1, inductor L1, and diode D1; BUCK circuit B includes switch tube Q2, inductor L2, and diode D2; when switch tube Q3 is turned on, BUCK circuit B forms a loop, and BUCK circuit A outputs a constant The current is added to the welding wire and the workpiece as the base value of the pulse current. When the switch tube Q3 is turned off, due to the large inductance value of the inductor L2, the current direction remains unchanged, the current of the BUCK circuit B is superimposed on the BUCK circuit A through the diode D3, and the currents of the two BUCK circuits are added Applied to the welding wire and the workpiece as the peak value of the pulse current. Because the switching between the base v...

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Abstract

The invention discloses a gas metal arc welding method and a gas metal arc welding system, and belongs to the field of gas metal arc welding control. Constant wire feed is adopted, the wire feed rate ranges from 1.5 to 18m / min, a welding source outputs pulse current, and the average value of the pulse current is preset according to the wire feed rate before welding and is kept unchanged in the welding process; the arc voltage Ug is given before welding, a feedback value Uf of the arc voltage is sampled in real time in the welding process, and delta I is equal to the absolute value of k(Uf-Ug), wherein delta I is regulation current, and k is a proportionality coefficient and ranges from 10 to 100; when the feedback value Uf of the arc voltage increases, delta I is subtracted from the peak value Ip of the pulse current, and the basic value current Ib is added to delta I to keep the arc voltage stable; and when the feedback value Uf of the arc voltage decreases, the adjusting process is reversed. By the high frequency pulse current, the average value and the effective value of the current are obviously different, so that on the premise that the heat input of a base metal the heating of a solder wire is not changed basically, the heating of a solder wire is changed, the melting rate of the solder wire is adjusted and the arc length is adjusted.

Description

technical field [0001] The invention belongs to the field of MIG shielded welding control, and specifically refers to a shielded welding system which is different from the traditional MIG shielded welding technology and whose external characteristic of power output is constant current. technical background [0002] Welding plays an important role in the industrial field. Only by maintaining the stable combustion of the arc during the welding process can high-quality welds be obtained. Most of the welding of medium and thin plates adopts thin wire welding. In thin wire welding, there are mainly two control methods: pulse welding and short-circuit transition. The arc length adjustment in pulse welding often adopts the SINERGIC control method and the method of voltage-frequency conversion; Long adjustments often use the waveform control method. [0003] The SINERGIC control method determines the welding parameters by the wire feeding speed through the preset relationship curve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/073B23K9/10
Inventor 黄鹏飞卢振洋张永刚白韶军
Owner BEIJING UNIV OF TECH
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