KR20120000953A - Pulse welding method for reducing spatter using current pattern change - Google Patents

Abstract

PURPOSE: A pulse welding method for reducing spatter using a current pattern change is provided to reduce welding defects by reducing spatter more than 10%. CONSTITUTION: A pulse welding method for reducing spatter using a current pattern change comprises a current pattern change. The current pattern change is composed of a base section, an ascent section, a peak section, and a descent section. In the base section, globules are separated from a supply wire and are fused with a globule member. In the ascent section, the fusion of the supply wire is started. In the peak section, the supply wire is fused until a globule is formed in the front end of the supply wire. In the descent section, the globule formed in the front end of the supply wire is separated from the supply wire.

Description

Pulse welding method using reduced current pattern {PULSE WELDING METHOD FOR REDUCING SPATTER USING CURRENT PATTERN CHANGE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse welding method in which spatters are reduced by using a current pattern change, and more particularly, in pulse welding of arc welding, which is a type of various metal joints used in shipbuilding, automobiles, home appliances, and the like. The present invention relates to a pulse welding method in which spatter is reduced by using a current pattern change to reduce spatter.

In general, arc welding is a metal bonding method in which a metal wire is melted by an arc heat generated by an arc between a base material and a metal wire to bond the base material and the base material. In this process, the metal wire is continuously supplied by the external feeder and has a certain length of arc between the metal wire and the base material by controlling the arc current properly in synchronization with the wire feeding speed supplying the metal wire. Will be implemented.

That is, the arc length must be controlled constantly, which is determined by the relationship between the feeding speed of the wire and the amount of arc current. However, during welding, the arc length is not constant but shortened due to various causes. In other words, when a short-circuit phenomenon occurs in which the feed wire directly comes into contact with the base metal and falls, a large amount of spatter, which is a poor welding, is generated, which leads to economic loss and poor welding, such as having to undergo a secondary process of ignition and welding.

 In order to minimize the spatter, which is a poor welding in arc welding, a method of applying a current as a pulse has been used as a conventional welding method. Pulse welding is welding in which the optimum energy required to melt the molten metal is pulsed to melt the metal so that one volume per pulse can occur.

As shown in FIG. 1, the current pulse applied in the conventional welding method has been divided into a base current, a peak current, a rising current, a falling current, etc. in a trapezoidal waveform. However, despite these pulses, short circuits have frequently occurred in the section in which the volume is separated in the falling section, which has been a problem due to the generation of large-scale spatters.

Accordingly, an object of the present invention is to solve the above problems, by changing the shape of the pulse current pattern in the pulse welding, unlike the conventional method, by changing the slope of the peak current and falling current, the current pattern to reduce the spatter It is an object of the present invention to provide a pulse welding method in which spatter is reduced by using a change.

The pulse welding method which reduces the spatter by using the current pattern change according to the present invention is pulse welding; Base current is supplied as the welding current, the base section in which the volume formed at the tip of the supply wire is separated from the supply wire to fall on the volume base material and the volume of the supply wire can be melted with the volume base material; A rising section in which the welding current rises from the base current to the peak current and the supply wire starts melting; A peak period until the welding current rises from the peak current to the maximum peak current, and the supply wire melts in earnest to form a volume at the tip of the supply wire; The welding current is lowered from the maximum peak current to the base current, the falling section until the volume formed on the front end of the supply wire is separated from the supply wire to close to the volume base material.

Moreover, the pulse welding method which reduced the spatter using the change of the current pattern which concerns on this invention is pulse welding; Base current is supplied as the welding current, the base section in which the volume formed at the tip of the supply wire is separated from the supply wire to fall on the volume base material and the volume of the supply wire can be melted with the volume base material; A rising section in which the welding current rises from the base current to the peak current and the supply wire starts melting; A peak period until the welding current maintains the peak current for a predetermined period and then rises to the maximum peak current, and the supply wire melts in earnest to form a volume at the tip of the supply wire; The welding current is lowered from the maximum peak current to the base current, the falling section until the volume formed on the front end of the supply wire is separated from the supply wire to close to the volume base material.

Moreover, the pulse welding method which reduced the spatter using the change of the current pattern which concerns on this invention is pulse welding; Base current is supplied as the welding current, the base section in which the volume formed at the tip of the supply wire is separated from the supply wire to fall on the volume base material and the volume of the supply wire can be melted with the volume base material; A rising section in which the welding current rises from the base current to the peak current and the supply wire starts melting; A peak period until the welding current maintains the peak current, and the supply wire melts in earnest to form a volume at the tip of the supply wire; The welding current falls from the peak current to the base current, but with two different inclinations, and the falling section until the volume formed at the tip of the supply wire is separated from the supply wire and closed in the volume base material. It is characterized by.

Moreover, the pulse welding method which reduced the spatter using the change of the current pattern which concerns on this invention is pulse welding; Base current is supplied as the welding current, the base section in which the volume formed at the tip of the supply wire is separated from the supply wire to fall on the volume base material and the volume of the supply wire can be melted with the volume base material; A rising section in which the welding current rises from the base current to the peak current and the supply wire starts melting; A peak period until the welding current rises from the peak current to the maximum peak current, and the supply wire melts in earnest to form a volume at the tip of the supply wire; A period in which the welding current temporarily falls below the base current at the peak current and maintains the base current again, and the dropping period until the volume formed at the tip of the supply wire is separated from the supply wire and closed in the volume base material; Characterized in that consisting of.

As described above, in the pulse welding method of reducing the spatter by using the current pattern change according to the present invention, the amount of spatter generated can be reduced by about 5% or more, in particular, a large capacity spatter (diameter 1 mm or more). In this case, by reducing the spatter by about 10% or more, it is possible to reduce welding defects that occurred in conventional pulse welding, and to improve productivity and work efficiency by affecting secondary process improvement for spatter reduction. have.

1 is a diagram showing a current pattern in a conventional pulse welding method.
2 is a view illustrating an embodiment of a current pattern change in a pulse welding method in which spatter is reduced by using a current pattern change in accordance with the present invention.
3 is a view showing another embodiment of the current pattern change in the pulse welding method of reducing the spatter by using the current pattern change in accordance with the present invention.

Hereinafter, a pulse welding method in which spatter is reduced by using a current pattern change according to the present invention will be described in detail with reference to the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to a client's or operator's intention or custom. Therefore, the definition should be based on the contents throughout this specification.

Like numbers refer to like elements throughout the drawings.

2 is a view illustrating an embodiment of a current pattern change in a pulse welding method using a current pattern change according to the present invention, and FIG. 3 illustrates a spatter using a current pattern change according to the present invention. Fig. 1 shows another embodiment of the current pattern change in the reduced pulse welding method.

2 and 3, the pulse welding method of reducing the spatter by using the current pattern change according to the present invention is to propose a conventional pulse shape in a new form, of the new form of the existing peak current section There are two ways to attempt a change (method A and B) and an attempt to change the falling section (method C and D).

As shown in Figure 2 and 3, the pulse welding method of reducing the spatter by using the current pattern change in accordance with the present invention is divided into four sections of the base section, the rising section, the peak section, the falling section At this time, the molten state of the welding wire is divided into five states. The pulse welding method which reduces the spatter by using the current pattern change according to the present invention is to propose a conventional pulse shape in a new form, a method of attempting to change the existing peak current section of the new form (A method , Method B) and the method of attempting to change the falling section (method C, D).

Here, in the method A, the base section is a section in which the volume formed at the tip of the supply wire is separated from the supply wire and falls to the volume base material so that the volume of the supply wire can be melted with the volume base material, and the base current is supplied as the welding current. Become; The rising section is a section in which the supply wire starts melting, and the welding current rises from the base current to the peak current; The peak section is a section until the supply wire is melted in earnest and a volume is formed at the tip of the supply wire, and the welding current rises from the peak current to the maximum peak current; The falling section is the section until the volume formed at the tip of the supply wire is separated from the supply wire and closed on the volumetric base material, and the welding current falls from the maximum peak current to the base current.

 In the B method, the base section is a section in which the volume formed at the tip of the supply wire is separated from the supply wire and falls to the volume base material so that the volume of the supply wire can melt with the volume base material, and the base current is supplied as the welding current; The rising section is a section in which the supply wire starts melting, and the welding current rises from the base current to the peak current; The peak section is a section until the supply wire is melted in earnest and a volume is formed at the tip of the supply wire, and the welding current maintains the peak current for a certain period and then rises from the peak current to the maximum peak current; The falling section is the section until the volume formed at the tip of the supply wire is separated from the supply wire and closed on the volumetric base material, and the welding current falls from the maximum peak current to the base current.

In the C method, the base section is a section in which the volume formed at the tip of the supply wire is separated from the supply wire and falls to the volume base material so that the volume of the supply wire can melt with the volume base material, and the base current is supplied as the welding current; The rising section is a section in which the supply wire starts melting, and the welding current rises from the base current to the peak current; A peak section is a section until the supply wire melts in earnest and one volume is formed at the tip of the supply wire, and the welding current maintains the peak current; The falling section is a section until the volume formed at the tip of the supply wire is separated from the supply wire and closed on the volume base material, and the welding current falls from the peak current to the base current in two different slopes.

In the D method, the base section is a section in which the volume formed at the tip of the supply wire is separated from the supply wire and falls to the volume base material so that the volume of the supply wire melts with the volume base material, and the base current is supplied as the welding current; The rising section is a section in which the supply wire starts melting, and the welding current rises from the base current to the peak current; A peak section is a section until the supply wire melts in earnest and one volume is formed at the tip of the supply wire, and the welding current maintains the peak current; The falling section is the section until the volume formed at the tip of the supply wire is separated from the supply wire and closed to the volume base material, and the welding current temporarily falls below the base current at the peak current and then maintains the base current again. .

In other words, the method A and B is a method of raising the current in a linear or non-linear manner by changing the current in the peak section, so that the final current value of the peak section can have a higher value. .

Here, the A method is a method of linearly increasing the current in the peak section to have a constant slope, and the B method is divided into a peak 1 section and a peak 2 section by providing a step section for the current rise, and the peak 1 current and the peak 2 current. How to put. As a result, as the end current of the entire peak section is increased, the current value of the volumetric displacement of the current increases, so that the volumetric transition can be caused smoothly. In addition, as the starting current of the entire peak section is lowered, the burden on the hardware switching element for implementing the peak current is reduced, and the spatter is reduced at the start of volumetric displacement.

In addition, in the case of the C method and the D method, the current shape is changed in the falling section. In the falling section, the current drops rapidly and the volume moves from the welding wire to the base material. The sharper the slope of the current is, the faster the displacement occurs.

Here, in the case of the C method, the current is sharply lowered by the slope and the slope slope is changed by the slope without reaching the base current section. This approach prevents short circuits in advance by predicting the feasibility before the volume is fully implemented. D method is to lower the current completely and keep it constant again as the base current. This method is to control the current slope down as quickly as possible without detecting short-circuit in advance.

In the pulse welding method in which spatter is reduced by using the current pattern change according to the present invention, the amount of spatter generated can be reduced by about 5% or more compared with the conventional method, and especially in the case of a large capacity spatter (diameter 1 mm or more) By reducing the abnormal spatter, it is possible to reduce the welding defects that occurred in the conventional pulse welding, and to improve the productivity and work efficiency by affecting the secondary process improvement for reducing the spatter.

As described above, the present invention has been described based on the preferred embodiments, but these embodiments are intended to illustrate the present invention, not to limit the present invention, so that those skilled in the art to which the present invention pertains can perform the above without departing from the technical spirit of the present invention. Various changes, modifications or adjustments to the example will be possible. Therefore, the protection scope of the present invention should be construed as including all changes, modifications or adjustments belonging to the gist of the technical idea of the present invention.

Claims (4)

Pulse welding;
Base current is supplied as the welding current, the base section in which the volume formed at the tip of the supply wire is separated from the supply wire to fall on the volume base material and the volume of the supply wire can be melted with the volume base material;
A rising section in which the welding current rises from the base current to the peak current and the supply wire starts melting;
A peak period until the welding current rises from the peak current to the maximum peak current, and the supply wire melts in earnest to form a volume at the tip of the supply wire;
The welding current falls from the maximum peak current to the base current, and a falling section until the volume formed at the tip of the supply wire is separated from the supply wire and closed on the volumetric base material. Pulse welding method using a spatter is reduced.
Pulse welding;
Base current is supplied as the welding current, the base section in which the volume formed at the tip of the supply wire is separated from the supply wire to fall on the volume base material and the volume of the supply wire can be melted with the volume base material;
A rising section in which the welding current rises from the base current to the peak current and the supply wire starts melting;
A peak period until the welding current maintains the peak current for a predetermined period and then rises to the maximum peak current, and the supply wire melts in earnest to form a volume at the tip of the supply wire;
The welding current falls from the maximum peak current to the base current, and a falling section until the volume formed at the tip of the supply wire is separated from the supply wire and closed on the volumetric base material. Pulse welding method using a spatter is reduced.
Pulse welding;
Base current is supplied as the welding current, the base section in which the volume formed at the tip of the supply wire is separated from the supply wire to fall on the volume base material and the volume of the supply wire can be melted with the volume base material;
A rising section in which the welding current rises from the base current to the peak current and the supply wire starts melting;
A peak period until the welding current maintains the peak current, and the supply wire melts in earnest to form a volume at the tip of the supply wire;
The welding current falls from the peak current to the base current, but with two different inclinations, and the falling section until the volume formed at the tip of the supply wire is separated from the supply wire and closed in the volume base material. A pulse welding method in which spatter is reduced by using a current pattern change.
Pulse welding;
Base current is supplied as the welding current, the base section in which the volume formed at the tip of the supply wire is separated from the supply wire to fall on the volume base material and the volume of the supply wire can be melted with the volume base material;
A rising section in which the welding current rises from the base current to the peak current and the supply wire starts melting;
A peak period until the welding current rises from the peak current to the maximum peak current, and the supply wire melts in earnest to form a volume at the tip of the supply wire;
A period in which the welding current temporarily falls below the base current at the peak current and maintains the base current again, and the dropping period until the volume formed at the tip of the supply wire is separated from the supply wire and closed in the volume base material; Pulse welding method of reducing the spatter by using a current pattern change, characterized in that consisting of.

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