KR102422262B1 - Weld beads forming method for WPS preparation - Google Patents

Abstract

The present invention relates to a method for forming a weld bead for WPS creation, and more particularly, to a method for rapidly forming a weld bead by spline interpolation when specimen shape information is input. An object of the present invention is to provide a welding bead forming method for quickly forming a weld bead regardless of the shape of the specimen when the shape information of the specimen is input, and when the shape of the specimen is developed, the coordinates of the feature points are automatically calculated, It is intended to provide a welding bead forming method capable of quickly creating a weld bead shape regardless of the number of layers in which the weld bead is stacked by forming a curve by applying a spline interpolation method to create a weld bead.

Description

Weld bead forming method for WPS preparation {Weld beads forming method for WPS preparation}

The present invention relates to a method of forming a weld bead for WPS creation, and more particularly, to a method of rapidly forming a weld bead by interpolation when specimen shape information is input.

WPS is an abbreviation of Welding Procedure Specification. It is a document that provides variables necessary for actual welding to guarantee the repeatability of welding construction. In other words, the WPS should contain welding information such as electrodes and shielding gases, the welding location, the welding power source, the material shape, and the welding bead sequence, which the welding engineer must understand.

In particular, the weld beads are important because they are located closely. However, when drawing a bead shape to represent a bead sequence, it is not expressed by a specific rule, but based on the experience of a welding engineer. Therefore, the bead sequences drawn by each welding engineer are drawn in different shapes.

Welding engineers generally create weld bead shapes by using CAD programs on a computer. However, it takes a lot of time to describe the multi-pass weld bead, and in the case of welding work, the duration is particularly important, and it is also closely related to the manufacturing cost, so the weld bead must be drawn quickly and accurately. However, when drawing the shape of a weld bead using CAD, it takes at least 30 minutes, so there is a problem that the economic feasibility is low. There is a problem that it is low.

1. Republic of Korea Patent Publication No. 10-1810114 ("Web-based welding procedure specification preparation method", 2017.12.12.)

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a method of forming a weld bead in which, when shape information of a specimen is input, the weld bead is rapidly formed regardless of the shape of the specimen.

When the shape of the specimen is developed, the feature point coordinates are automatically calculated, and the spline interpolation method is applied to form a curve to form a weld bead. To provide a forming method.

In the welding bead forming method for preparing WPS of the present invention, a specimen condition input step of inputting a specimen condition according to a shape of a specimen to be welded; a bead condition input step in which a bead condition to be formed on the specimen is inputted before, after, and simultaneously at one time point selected from the sample condition input step; a bead forming step of implementing a curve using a predetermined function based on the values input in the specimen condition input step and the bead condition input step and a plurality of coordinate points, and forming a weld bead with the implemented curve; and an output step of outputting the weld bead formed in the bead forming step to the outside.

In addition, the specimen includes a first specimen that is a specimen positioned on one side and a second specimen that is a specimen positioned on the other side, and the specimen conditions include a thickness of the specimen, and an angle between the first specimen and the second specimen. , characterized in that it comprises at least one or more of the distance between the first specimen and the second specimen.

In addition, the specimen is characterized in that a vertical surface formed at a predetermined height perpendicular to the ground is formed on a surface where the first specimen and the second specimen face each other, and the specimen condition is, the height of the vertical surface and the specimen It characterized in that it further comprises the height of the welding bead protruding with respect to the upper surface of the.

In addition, the angle between the first specimen and the second specimen is characterized in that the angle between the first specimen from the reference line and the angle between the second specimen from the reference line with respect to a predetermined reference line are respectively input.

In addition, the bead condition is characterized in that it includes the number of layers in which the welding beads are laminated on the welding portion of the specimen and the number of welding beads to be formed in each layer.

In addition, in the bead forming step, first, a curve is implemented on the welding surface of the first specimen or the second specimen, and among the welding surfaces of the first and second specimen, the curved surface of the specimen is not implemented. After implementing the curve, it is characterized in that the curve is implemented in the space between the first specimen and the second specimen.

In addition, the curve is characterized in that it is implemented as a combination of an S-curve-shaped curve and a C-curve-shaped curve.

In addition, the function is characterized in that it is the following formula.

[Equation]

일 때,(From here,

when,

,

,

,

)

,

,

,

)

The welding bead forming method for preparing WPS of the present invention can provide a welding bead forming method for quickly forming a weld bead regardless of the shape of the specimen when the shape information of the specimen is input.

When the shape of the specimen is developed, the feature point coordinates are automatically calculated, and the spline method is applied to form the weld bead to form the weld bead. A method of forming may be provided.

1 is a flowchart of a method for forming a weld bead for creating a WPS according to an embodiment of the present invention;
2 is a schematic view of a specimen of a welding bead forming method for WPS creation according to an embodiment of the present invention;
3 is an input condition table according to a welding bead forming method for WPS creation according to an embodiment of the present invention;
4 is a flow chart of forming a bead according to a method of forming a weld bead for forming a WPS according to an embodiment of the present invention;
5 is a curve formation coordinates of a welding bead formation method for WPS creation according to an embodiment of the present invention;
6 is a schematic view of various types of specimens according to a method for forming a weld bead for WPS preparation according to an embodiment of the present invention;

Hereinafter, an embodiment of the present invention as described above will be described in detail with reference to the drawings.

1 is a flowchart illustrating a method of forming a weld bead for forming a WPS according to an embodiment of the present invention. As shown in FIG. 1 , in the welding bead forming method according to an embodiment of the present invention, the welding bead forming system receives the shape information of the specimen 100 as the welding object, the specimen condition input step (S100), the welding bead forming system How many layers of this weld bead are stacked, and the bead condition input step (S200) that receives input of how many beads to form on each layer, the weld bead forming system is the specimen condition input step (S100) and the bead condition input step (S200) An output step (S400) that is output to a display or a printer so that a welding engineer can visually check the weld bead formed in the bead forming step (S300) and the bead forming step (S300) in which the weld bead is formed based on the value input in characterized by including.

In the welding bead forming method according to one embodiment, the bead condition input step (S200) is performed after the specimen condition input step (S100), but the specimen condition input step (S100) and the bead condition input step (S200) are performed simultaneously Alternatively, the specimen condition input step (S100) may proceed after the bead condition input step (S200). The specimen information input in the specimen condition input step ( S100 ) will be described in more detail with reference to FIG. 2 .

Figure 2 shows a schematic diagram of a specimen of a method of forming a weld bead for forming a WPS according to an embodiment of the present invention. As shown in FIG. 2 , in order to describe the specimen 100 as a welding object in more detail, the specimen located on the left is referred to as the first specimen 110 and the specimen located on the right is referred to as the second specimen 120 . The information input in the specimen condition input step (S100) is the thickness of the specimen (MT), the distance (RG) between the first specimen 110 and the second specimen 120, and the first specimen 110 and the second specimen 120 ) and the lower portion of the opposite surface, the height (RF) of the vertical surface formed perpendicular to the ground, not the inclined surface, and the angle (GA) between the first specimen 110 and the second specimen 120 are input. A value input to form a weld bead on the specimen shown in FIG. 2 will be described in more detail with reference to the input condition table of FIG. 3 .

3 illustrates an input condition table according to a welding bead forming method for WPS creation according to an embodiment of the present invention. As shown in Figure 3, the specimen thickness (MT), the height of the vertical plane (RF), the angle (GA) between the first specimen 110 and the second specimen 120, the first specimen 110 and the second specimen ( 120), the distance RG and the height of the reinforcing part 130 are input. At this time, the reinforcing part 130 is referred to as the reinforcing part 130, a portion that protrudes when the upper surface of the specimen 100 is used as a reference plane, and the height of the reinforcing part 130 may be set by a welding engineer to suit the working environment. After the specimen condition including the height value of the reinforcing part 130 from the specimen thickness MT is input, the bead condition is input. As shown in FIG. 3, the number of bead layers is 8. This means to form a weld bead stacked in 8 layers. Then, the number of beads to be formed in the 8th layer is input from the number of beads to be formed in the first layer. The beads for welding the specimen 100 shown in FIG. 2 are 1 in the first layer, 2 in the 2nd and 3rd layers, 3 in the 4th layer, 4 in the 5th and 6th layers, and 5 in the 7th layer. , the bead conditions for forming 6 weld beads are input to the 8th layer.

The weld bead forming system that receives the specimen condition and the bead condition forms a curve using a function stored in advance, and the curves are combined to form a weld bead. This will be described in more detail with reference to FIG. 4 .

4 is a view showing a bead forming flow chart according to a welding bead forming method for forming a WPS according to an embodiment of the present invention. As shown in FIG. 4 , a curve is drawn with respect to the inclined surface of the first specimen 110 first. At this time, the curve is implemented by Hermitian interpolation method. The Hermitian interpolation method will be described later. Curves are sequentially drawn with respect to the inclined surface of the first specimen 110, and as shown in the enlarged part, the curve formed at the bottom and the curve formed at the top is an S-curve, and the curve filled in the middle is It is preferable to have a C-curve shape. The reason why the curves formed at the bottom and the top are formed as an S-curve is that the welding rod is heated and melted during welding, so surface tension is generated at both ends. do. Thereafter, a curve is implemented on the inclined surface of the second specimen 120 . Similarly, the second specimen 120 is also implemented as an S-curve, and a curve drawn in the middle is implemented as a C-curve. Next, a curve filling between the curve implemented on the inclined surface of the first specimen 110 and the curve implemented on the inclined surface of the second specimen 120 is implemented, which is implemented as a C-curve. After the central part is completely filled, it is finished by implementing a curve on the upper surface of the specimen. At this time, a portion protruding from the upper surface of the specimen 100 is the reinforcement portion 130 . Looking at the implemented bead shape, the number of bead layers is 10, the number of beads in the first layer is 1, the number of beads in the second and third layers is 2, and the number of beads in the fourth layer is 3, 5, 6, 7 It can be seen that the number of beads is 4, the number of beads in the 8th and 9th layers is 5, and the number of beads in the 10th layer is 6.

Figure 5 shows the curve formation coordinates of the welding bead formation method for WPS creation according to an embodiment of the present invention. As shown in (a) of FIG. 5, an S curve is implemented by connecting four coordinate points, and a C curve is implemented by connecting five coordinate points as shown in FIG. 5 (b). In the case of the C curve, although three coordinate points are also implemented, in the case of an embodiment of the present invention, the C curve is implemented by connecting five coordinate points to increase accuracy, and the number of coordinate points is not limited.

라고 한다. (x,y)로 이루어진 2차원 좌표에서

는 I번째 인터벌이라고 하고, y 값 차분을

로 나눈 값을

라고 한다면 하기 수식 1과 수식 2와 같이 표현될 수 있다.Based on a given coordinate point, a curve such as an S-curve or C-curve can be implemented using equations within the cubic equation.

It is said In two-dimensional coordinates consisting of (x,y)

is called the I-th interval, and the y-value difference is

divided by

It can be expressed as Equation 1 and Equation 2 below.

[Formula 1]

[Equation 2]

에서

의 기울기는

로 표현할 수 있다.

범위에서

,

라고 한다면, 3차 방정식

는 수식 3과 같이 표현할 수 있다.In addition,

at

the slope of

can be expressed as

in the range

,

If , then the cubic equation

can be expressed as Equation 3.

[Equation 3]

The cubic polynomial expressed by s and x as above requires four interpolation conditions, which are two function values and two derivative values at specific coordinates.

, ②

③

④

)(①)

, ②

③

④

)

Among the interpolation methods, the interpolation method using the condition that satisfies the condition of the differential value is called the Hermitian interpolation method. It can be obtained by knowing the differential value, and an S-curve or C-curve can be implemented with the calculated value. In this case, when the S curve is implemented, the first condition must be satisfied, and to implement the C curve, the second condition must be satisfied.

[1st condition]

[Second Condition]

6 is a schematic view showing various types of specimens according to a method of forming a weld bead for WPS preparation according to an embodiment of the present invention. As shown in (a) of FIG. 6 , the first specimen 110 is a vertical plane with respect to the ground, and when the second specimen 120 is a vertical plane, the angle between the first specimen 110 and the second specimen 120 is Entering (GA) may result in inaccurate weld beads. Therefore, in order to prevent this, when the counterclockwise angle with respect to the reference line L1 is divided into the first angle between the specimens (GA1) and the clockwise angle is divided into the angle between the second specimens (GA2), the first specimen 110 ) and the second specimen 120 can accurately form a weld bead even if the shape is not symmetrical.

In addition, as shown in (b) of FIG. 6 , even if the space between the first specimen 110 and the second specimen 120 is in an X-shape, a weld bead can be easily formed, and the center is divided by the reference line L2. Therefore, as described with reference to FIG. 6 (a), the counterclockwise angle with respect to the reference line L2 is divided into the first angle between the specimens (GA1), and the clockwise angle is divided into the angle between the second specimens (GA2), and GA A value may also be entered. As shown in (c) of FIG. 6, even if the welding space is formed in the vertical symmetrical shape of the embodiment shown in FIG. can form. Therefore, the welding bead forming method of the present invention has an effect that it is possible to form an appropriate weld bead on the specimen regardless of the shape of the specimen.

The technical idea should not be construed as being limited to the above-described embodiment of the present invention. Various modifications can be made at the level of those skilled in the art without departing from the gist of the present invention as claimed in the claims. Accordingly, such improvements and modifications fall within the protection scope of the present invention as long as it is apparent to those skilled in the art.

100 Psalms
110 Psalm 1
120 Second Psalm
130 reinforcement

Claims (8)

Specimen condition and bead condition are input through an input device, a curve is formed and combined using a function stored in advance according to the input condition to form a weld bead, and the formed weld bead shape is output through an output device. In the welding bead forming method for creating a WPS (Welding Procedure Specification) using the system,
a specimen condition input step in which a condition of a specimen according to a shape of a specimen to be welded is input to an input device of the welding bead forming system;
a bead condition input step in which a condition of a bead to be formed on a sample is inputted to an input device of a welding bead forming system, which is performed at a time selected from among before, after, and simultaneously with the inputting of the sample condition;
The welding bead forming system implements a curve using a predetermined function based on a plurality of coordinate points based on the specimen condition and the bead condition input through the specimen condition input step and the bead condition input step, and the implemented curve Bead forming step to implement the shape of the weld bead; and
An output step in which the shape of the weld bead formed in the bead forming step is output to a display or printer of the weld bead forming system;
The specimen includes a first specimen that is a specimen located on one side and a second specimen that is a specimen located on the other side, and a vertical surface formed at a predetermined height perpendicular to the ground is formed on a surface where the first specimen and the second specimen face each other. becomes,
The specimen condition includes at least one of the thickness of the specimen, the angle between the first specimen and the second specimen, the distance between the first specimen and the second specimen, the height of the vertical plane, and the height of the weld bead protruding from the upper surface of the specimen. do,
The angle between the first specimen and the second specimen is the angle between the first specimen from the reference line and the angle between the second specimen from the reference line based on a predetermined reference line, respectively,
The bead conditions include the number of layers in which the weld beads are laminated on the weld site of the specimen and the number of weld beads to be formed in each layer,
The bead forming step,
First, a curve is implemented on the welding surface of the first specimen or the second specimen, and a curve is implemented on the welding surface of the specimen in which the curve is not implemented among the welding surfaces of the first and second specimens, and then the first and second specimens A curve is implemented in the space between the specimens,
The curve is implemented as a combination of an S-curve-shaped curve and a C-curve-shaped curve, and among the curves for implementing the weld bead shape, the curve formed at the bottom and the curve formed at the top is an S-curve, The curve filled in the middle is a welding bead forming method, characterized in that it is formed in a C-curve shape.
delete delete delete delete delete delete The method of claim 1, wherein the function is
A welding bead forming method, characterized in that the following formula.
[Equation]

(From here,

when,

,

,

,

)

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