KR20120137673A - Welding method applicable inverse variation of welding distortion control - Google Patents

Welding method applicable inverse variation of welding distortion control Download PDF

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Publication number
KR20120137673A
KR20120137673A KR1020110056653A KR20110056653A KR20120137673A KR 20120137673 A KR20120137673 A KR 20120137673A KR 1020110056653 A KR1020110056653 A KR 1020110056653A KR 20110056653 A KR20110056653 A KR 20110056653A KR 20120137673 A KR20120137673 A KR 20120137673A
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South Korea
Prior art keywords
welding
steel members
deformation
strain
steel member
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KR1020110056653A
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Korean (ko)
Inventor
이정택
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현대중공업 주식회사
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Priority to KR1020110056653A priority Critical patent/KR20120137673A/en
Publication of KR20120137673A publication Critical patent/KR20120137673A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/003—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to controlling of welding distortion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

PURPOSE: A welding method employing pre-strain against welding strain is provided to weld steel members with pre-strain considering welding strain, thereby removing the need of separate restoring work. CONSTITUTION: A welding method employing pre-strain against welding strain comprises the steps of: measuring thermal strain caused by welding of first and second steel members(30,40) according to the type of the first and second steel members(A), storing the numeric thermal strain data in a data base(B), processing the pre-strained first and second steel members based on thermal strain data corresponding to the conditions of the first and second steel members inputted to the data base for welding the first and second steel members(C), and welding the pre-strained first and second steel members(D). [Reference numerals] (A) Measuring thermal strain caused by welding according to type of first and second steel members; (B) Storing numeric thermal strain data in data base; (C) Processing pre-strained first and second steel members; (D) Welding pre-strained first and second steel members

Description

Welding method applicable Inverse variation of welding distortion control

The present invention relates to a welding method in which the reverse deformation to the welding deformation is applied, and more particularly, the linear heating is performed after completion of welding by performing welding while applying the reverse deformation to the steel member as opposed to the thermal deformation generated during welding. The restore operation can be deleted.

In general, deformation occurs due to welding heat during welding W between various steel materials (hereinafter, referred to as steel members) to be welded to construct the hull.

In other words, as shown in FIG. 1, for example, the welding W between the surface portion 10 ′ of the first steel member 10 and the thickness surface portion 20 ′ forming the thickness of the second steel member 20. ), The first steel member 10 and the second steel member 20, which were in a horizontal form, are thermally deformed by heat as shown in the drawing.

Therefore, in the related art, when a heat deformation of the first steel member 10 and the second steel member 20 is bent as shown in the drawings, a welding heating torch is generally used as a method of applying a shrinkage load in the opposite direction to the bend. The restoration is corrected through on-line heating.

However, since the linear heating is a parallel operation of heating and expansion, it may not only adversely affect the steel member but also reduce the durability. There is a difficult problem.

In addition, when the linear heating is performed as described above, an increase in the amount of work for the linear heating and a large amount of working time are inevitable, which leads to a decrease in productivity and a decrease in the working efficiency.

Accordingly, the present invention is to solve the conventional problems as described above, the object of the present invention by applying the reverse deformation as opposed to the deformation occurring during welding between the steel member can be restored by the linear heating heating work It is an object of the present invention to provide a welding method in which a reverse deformation is applied to a welding deformation.

Solution to Problem The present invention for achieving the above object comprises the steps of measuring the thermal deformation caused by the welding of the first steel member and the second steel member for each type of the first steel member and the second steel member; Making a database of thermal deformation numerical information measured for each type of the first steel member and the second steel member; Machining the first and second steel members to which inverse strain is applied based on thermal deformation information that matches the conditions of the first and second steel members input to the database when welding the first and second steel members; Welding the first and second steel members to which the reverse deformation is applied; provides a welding method applying the reverse deformation to the welding deformation consisting of.

Further, in the step of measuring the thermal deformation, the measurement item for the thermal deformation, it is preferable to measure the thermal deformation region, the amount of deformation per thermal deformation region, the bending direction for each thermal deformation region of the first and second steel members.

As described above, the present invention eliminates a separate restoration work through linear heating by performing welding in a state in which the reverse deformation is applied in consideration of thermal deformation of the steel member, thereby improving productivity and work efficiency. You can expect the effect.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram for explaining restoration using heat deformation and linear heating by welding of a general steel member.
2 is a process chart showing a welding method to which the reverse deformation is applied to the welding deformation according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a process diagram showing a welding method to which the reverse deformation is applied to the welding deformation according to the present invention, and the first steel member 30 and the second steel member 40 which will be described later before explaining the present invention. Is the same as the first and second steel members 10 and 20 described in the prior art, but the reference numerals will be described differently so that there is no confusion between the prior art and the present invention in the description.

First, between the surface portion 30 'of the first steel member 30 and the thickness surface portion 40' forming the thickness of the second steel member 40 Measuring (A) thermal deformation generated by welding for each type of the first steel member 30 and the second steel member 40; After the step (A), the step (B) of making a database of thermal deformation numerical information measured for each type of the first steel member (30) and the second steel member (40); After the step (B), the thermal deformation that meets the conditions of the first and second steel members 30, 40 which are input to the database when welding the first and second steel members 30, 40 Machining (C) the first and second steel members 30, 40 to which the reverse deformation is applied based on the information; After the step (C), welding (W) the surface portion 30 'of the first steel member 30 to which the reverse deformation is applied and the thickness surface portion 40' of the second steel member 40 are welded (W). It consists of;

In the step (A) of measuring the thermal deformation, the types of the first steel member 30 and the second steel member 40 are determined according to size according to length, structure, thickness, shape, and the like. The deformation area, the deformation amount for each thermal deformation area, and the bending direction for each thermal deformation area are included. This thermal deformation information is interpreted numerically by various measuring instruments or devices.

Referring to the welding method to which the reverse deformation is applied to the welding deformation according to the present invention in detail, in the step (A) of measuring by the type of the first steel member 30 and the second steel member 40, The thermal deformation is measured and digitized for each type of the first and second steel members 30 and 40. In this case, the reason why the thermal deformation is measured for each type of the first and second steel members 30 and 40 is that the first and second steel members 30 and 40 may have various shapes due to differences in size, overall shape, thickness, and structure. This is because there are types and thermal deformation information is different for each type.

In the database (B), the measured values of the first steel member 30 and the second steel member 40 are databased for each type of the first steel member 30 and the second steel member 40. do. In the database operation, for example, a document is created and stored in a file format using various programs such as a document, management, and search used on a computer, and various other methods, for example, tables through manual writing, You can do this with a database in the form of a schematic.

In the machining steps of the first and second steel members 30 and 40 to which the inverse deformation is applied, they correspond to the conditions (eg, size, overall shape, thickness) of the first and second steel members 30 and 40. The first and second steel members 30 and 40 are processed by searching the database for thermal strain information, and applying an inverse strain value corresponding to the thermal strain information corresponding to the condition value.

When the first and second steel members 30 and 40 to which the reverse deformation is applied as described above are welded to each other (W), the first and second steel members 30 and 40 to which the reverse deformation is applied are deformed by the welding heat. The site is stuck in a state where it is restored by thermal deformation, and as a result, separate restoration work through on-line heating as in the prior art can be deleted. As a result, all problems and difficulties are solved.

Although the preferred embodiments of the present invention have been described above, those skilled in the art will appreciate that various modifications and changes may be made by those skilled in the art without departing from the scope of the present invention. Accordingly, modifications of the embodiments of the present invention will not depart from the technical scope of the present invention.

10, 30: 1st steel member 20, 40: 2nd steel member
10 ', 30': surface portion of the first steel member 20 ', 40': thickness surface portion of the second steel member

Claims (2)

Measuring (A) the thermal deformation generated by the welding of the first steel member 30 and the second steel member 40 for each type of the first steel member 30 and the second steel member 40;
After the step (A), the step (B) of making a database of thermal deformation numerical information measured for each type of the first steel member (30) and the second steel member (40);
After the step (B), the thermal deformation that meets the conditions of the first and second steel members 30, 40 which are input to the database when welding the first and second steel members 30, 40 Machining (C) the first and second steel members 30, 40 to which the reverse deformation has been applied based on the information;
Welding (W) after the step (C), the step (D) of welding (W) the first and second steel members 30 and 40 to which the reverse deformation is applied. Way.
The method of claim 1,
In the step (A) of measuring the thermal strain, the measurement items for the thermal strain are the thermal strain regions of the first and second steel members 30 and 40, the amount of strain for each thermal strain region, and the bending direction for each thermal strain region. Welding method applying the reverse deformation to the welding deformation characterized in that.
KR1020110056653A 2011-06-13 2011-06-13 Welding method applicable inverse variation of welding distortion control KR20120137673A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
KR1020110056653A KR20120137673A (en) 2011-06-13 2011-06-13 Welding method applicable inverse variation of welding distortion control

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103447699A (en) * 2013-08-16 2013-12-18 中国船舶重工集团公司第七二五研究所 Method for controlling welding deformation of titanium alloy
CN113814593A (en) * 2021-09-30 2021-12-21 中冶(上海)钢结构科技有限公司 Method for preventing steel plate from deforming in welding process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103447699A (en) * 2013-08-16 2013-12-18 中国船舶重工集团公司第七二五研究所 Method for controlling welding deformation of titanium alloy
CN113814593A (en) * 2021-09-30 2021-12-21 中冶(上海)钢结构科技有限公司 Method for preventing steel plate from deforming in welding process

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