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Forward and reverse feed AC arc welding method

A technology of AC arc and welding method, which is applied in arc welding equipment, welding equipment, manufacturing tools, etc., and can solve problems such as unstable welding status and changes

Active Publication Date: 2020-07-07
DAIHEN CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In the forward and reverse feed AC arc welding method in which the wire feed speed is alternately switched between the forward feed period and the reverse feed period, and the electrode polarity is alternately switched to electrode positive polarity and electrode negative polarity for welding, due to the electrode polarity The direction and value of the feed speed at the time of switching will change every time it is switched, so there is a problem that the welding state becomes unstable.

Method used

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Examples

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Embodiment approach 1

[0064] figure 1 It is a block diagram of a welding device for carrying out the forward and reverse feed AC arc welding method according to Embodiment 1 of the present invention. The following reference figure 1 to illustrate the blocks.

[0065] The inverter circuit INV takes a 3-phase 200V AC commercial power supply (not shown) as an input, rectifies and smoothes the AC commercial power supply to generate a DC voltage, and performs inverter control on the DC voltage according to a drive signal Dv described later. , thus outputting high-frequency AC.

[0066] The high-frequency transformer INT changes the high-frequency AC into a voltage value suitable for welding. The secondary rectifier group D2 rectifies the converted high-frequency AC, and outputs positive and negative DC voltages.

[0067] The output polarity of the welding device is switched by ON / OFF control of the electrode positive polarity switching element PTR and the electrode negative polarity switching elemen...

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Abstract

The invention provides a forward and reverse feed AC arc welding method. In the forward and reverse feed AC arc welding method, the welding state is suppressed from becoming unstable by switching the electrode polarity. Forward and reverse feeding is performed by switching the wire feed speed (Fw) alternately between forward feed and reverse feed, and by switching the electrode polarity alternately between positive electrode polarity (EP) and negative electrode polarity (EN). In the AC arc welding method, switching of the electrode polarity (Spn) is set during a period in which the feed rate (Fw) in the forward period is decelerating. Thereby, since the electrode polarity (Spn) is switched at a constant phase of the feed rate (Fw), the molten state at the time of switching becomes constant, and thus the welding state is stabilized.

Description

technical field [0001] The present invention relates to a forward and reverse feed alternating current arc welding method that switches the feed speed of the welding wire alternately between forward feed and reverse feed, and alternately switches electrode polarity to positive electrode polarity and negative electrode polarity for welding. Background technique [0002] In general consumable-electrode arc welding, a welding wire serving as a consumable electrode is fed at a constant speed, and an arc is generated between the welding wire and a base material to perform welding. In consumable-electrode arc welding, the welding wire and the base metal are often in a welding state where short-circuit periods and arc periods are alternately repeated. [0003] In order to further improve the welding quality, a method of periodically repeating forward and reverse welding of the welding wire is proposed (for example, refer to Patent Document 1, etc.). [0004] In the invention of Pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/00B23K9/067B23K9/12
CPCB23K9/00B23K9/067B23K9/124B23K9/173B23K9/073B23K9/125B23K9/1006
Inventor 田中利幸中俣利昭
Owner DAIHEN CORP
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