KR20150029878A - Structure for improving fatigue properties of weld structure - Google Patents

Structure for improving fatigue properties of weld structure Download PDF

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Publication number
KR20150029878A
KR20150029878A KR20130108832A KR20130108832A KR20150029878A KR 20150029878 A KR20150029878 A KR 20150029878A KR 20130108832 A KR20130108832 A KR 20130108832A KR 20130108832 A KR20130108832 A KR 20130108832A KR 20150029878 A KR20150029878 A KR 20150029878A
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KR
South Korea
Prior art keywords
base material
weld
thickness
present
welded
Prior art date
Application number
KR20130108832A
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Korean (ko)
Inventor
이도영
전민성
Original Assignee
삼성중공업 주식회사
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Filing date
Publication date
Application filed by 삼성중공업 주식회사 filed Critical 삼성중공업 주식회사
Priority to KR20130108832A priority Critical patent/KR20150029878A/en
Publication of KR20150029878A publication Critical patent/KR20150029878A/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
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/235—Preliminary treatment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

A weld structure fatigue improving structure is disclosed. A weld structure fatigue improving structure according to an embodiment of the present invention includes: a weld portion formed between a first base material and a second base material; And a stepped portion formed at an edge of the first base material and spaced apart from the welded portion, the stepped portion having a tendency to decrease in thickness toward the welded portion.

Description

[0001] STRUCTURE FOR IMPROVING FATIGUE PROPERTIES OF WELD STRUCTURE [0002]

The present invention relates to a weld structure fatigue improving structure.

Recently, many offshore plant structures have been designed and manufactured. Compared to other ships, offshore structures have a much longer design fatigue life and very strict design standards. In particular, the criteria for welding are strict, and various structures having various shapes are forced to weld for bonding with other structures, and fatigue problems arise in the welds. In general, in order to solve this fatigue problem, the thickness of the product is further increased to secure the fatigue life by lowering the stress generated.

However, the method of thickening the thickness of the product has a problem in that the weight of the product itself increases and the manufacturing cost increases.

An embodiment of the present invention is to provide a weld structure fatigue improving structure that ensures required fatigue performance without increasing the thickness of the welded structure.

According to an aspect of the present invention, there is provided a welding apparatus comprising: a welding portion formed between a first base material and a second base material; And a stepped portion formed at an edge of the first base material and spaced apart from the welded portion, the stepped portion having a tendency to decrease in thickness toward the welded portion.

The thickness of the stepped portion may continuously decrease toward the welded portion.

The thickness reduction ratio can be maintained constantly toward the welded portion.

The weld structure fatigue improving structure may further include a parallel portion formed between the step portion and the weld portion and formed in the first base material and having a constant thickness.

The parallel portion may have at least the same thickness with respect to the second base material.

According to the embodiment of the present invention, the step portion having a tendency to decrease in thickness is formed on the first base material, thereby relieving the stress concentration of the weld portion and improving the fatigue performance of the weld structure without increasing the thickness of the weld structure.

1 is a cross-sectional view of a weld structure fatigue improving structure according to an embodiment of the present invention,
2 is a cross-sectional view of a weld structure fatigue improving structure according to another embodiment of the present invention,
3 is a cross-sectional view of a weld structure fatigue improving structure according to another embodiment of the present invention,
4 is a cross-sectional view of a weld structure fatigue improving structure according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, do.

1 is a cross-sectional view of a weld structure fatigue improving structure according to an embodiment of the present invention. 1, a weld structure fatigue improving structure according to the present embodiment includes a first base material 10, a second base material 20, a weld 30, a step portion 40, and a parallel portion 50 .

The first base material 10 and the second base material 20 are welded together to form a welded structure. A weld 30 is formed between the first base material 10 and the second base material 20. The welding portion 30 is formed by melting a welding material between the first base material 10 and the second base material 20. The first base material 10 is provided thicker than the second base material 20 as a whole.

A step 40 is formed at the edge of the first base material 10. The stepped portion 40 is spaced apart from the welded portion 30. The thickness of the step portion 40 tends to decrease toward the welded portion 30. The thickness of the step portion 40 is continuously decreased toward the welded portion 30. The thickness reduction rate of the step portion 40 is maintained constantly toward the welded portion 30.

The first base material 10 is formed with a parallel portion 50 adjacent to the outside of the step portion 40. The parallel portion 50 is provided with a constant thickness. The parallel portion 50 is located between the step portion 40 and the weld portion 30 and is joined to the second base material 20 through the weld portion 30. [

The parallel portion 50 has at least the same thickness as the second base material 20. That is, the parallel portion 50 may have the same thickness as the second base material or may have a large thickness.

The first base material 10 may be fabricated by casting to form the step 40 and the parallel portion 50, but is not limited thereto.

According to this embodiment, the maximum stress is generated at the end E of the stepped portion 40. A concentrated stress is generated at the end E of the stepped portion 40 because the thickness of the first base material 10 changes abruptly at the end E of the stepped portion 40. Stress concentration is concentrated at the end E of the step portion 40, so that concentration of stress in the weld portion 30 is relaxed relatively.

The welding portion 30 is subjected to a stricter standard than the first base material 10 in terms of fatigue life. When the step portion 40 is formed in the first base material 10, the stress concentration of the welded portion 30 is relaxed and the fatigue life standard of the welded portion 30 can be easily passed.

Therefore, the fatigue-improving structure of the welded structure according to the present embodiment does not need to increase the thicknesses of the first base material 10 and the second base material 20 in order to pass the fatigue life standard of the welded portion 30, The weight is not increased and the manufacturing cost is not increased.

2 is a cross-sectional view of a weld structure fatigue improving structure according to another embodiment of the present invention. 2, the weld structure fatigue improving structure according to the present embodiment includes a first base material 10, a second base material 20, a welded portion 30, a stepped portion 41, and a parallel portion 50 . The structure for improving the fatigue of the welded structure according to the present embodiment differs from that of the previous embodiment in the shape of the stepped portion 41.

The thickness of the stepped portion 41 tends to decrease toward the welded portion 30. The thickness of the step portion 41 is continuously decreased toward the welded portion 30. The stepped portion 41 increases the thickness reduction rate toward the welded portion 30. That is, the step portion 41 forms a convex curved surface.

According to this embodiment, the maximum stress is generated at the end E of the stepped portion 41.

3 is a cross-sectional view of a weld structure fatigue improving structure according to another embodiment of the present invention. 3, the weld structure fatigue improving structure according to the present embodiment includes a first base material 10, a second base material 20, a weld 30, a step portion 42, and a parallel portion 50 . The weld structure fatigue improving structure according to the present embodiment is different from the previous embodiments in the shape of the step portion 42. [

The thickness of the step portion 42 tends to decrease toward the welded portion 30. [ Further, the thickness of the step portion 42 is continuously decreased toward the welded portion 30. The thickness reduction rate of the step portion 42 decreases toward the welded portion 30. That is, the step portion 42 forms a concave curved surface.

According to the present embodiment, the maximum stress is generated at the end E of the step portion 42.

4 is a cross-sectional view of a weld structure fatigue improving structure according to another embodiment of the present invention. 4, the weld structure fatigue improving structure according to the present embodiment includes a first base material 10, a second base material 20, a weld portion 30, a step portion 43, and a parallel portion 50 . The weld structure fatigue improving structure according to the present embodiment is different from the previous embodiments in the shape of the step 43.

The thickness of the step portion 43 tends to decrease toward the welded portion 30. For example, the step 43 includes a decreasing section in which the thickness is decreased, a maintaining section in which the thickness is kept constant, and a decreasing section in which the thickness is decreased. In this case, the stepped portion 43 tends to decrease in thickness as a whole. Needless to say, however, it is possible to suggest various types of stepped portions 43 having a tendency of decreasing in thickness toward the welded portion 30 only by way of example.

According to the present embodiment, the maximum stress is generated at the end E of the step portion 43.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, many modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

10: first base material 20: second base material
30: welding portion 40, 41, 42, 43:
50: parallel portion

Claims (5)

A weld formed between the first base material and the second base material; And
And a stepped portion formed at an edge of the first base material and spaced apart from the welded portion, the stepped portion having a tendency to decrease in thickness toward the welded portion. The method according to claim 1,
Wherein the step portion is continuously reduced in thickness toward the welded portion. 3. The method of claim 2,
Wherein the step portion is maintained at a constant thickness reduction rate toward the welded portion. 4. The method according to any one of claims 1 to 3,
Further comprising a parallel portion formed between the step portion and the weld portion and formed in the first base material and having a constant thickness. In the fourth aspect,
And the parallel portion has at least the same thickness with respect to the second base material.
KR20130108832A 2013-09-11 2013-09-11 Structure for improving fatigue properties of weld structure KR20150029878A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR20130108832A KR20150029878A (en) 2013-09-11 2013-09-11 Structure for improving fatigue properties of weld structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR20130108832A KR20150029878A (en) 2013-09-11 2013-09-11 Structure for improving fatigue properties of weld structure

Publications (1)

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KR20150029878A true KR20150029878A (en) 2015-03-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112780849A (en) * 2021-01-05 2021-05-11 中国石油大学(北京) Unequal wall thickness pipeline with internal transition section and design method
CN114131226A (en) * 2020-09-04 2022-03-04 中国石油天然气集团有限公司 Manufacturing method of tee joint

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114131226A (en) * 2020-09-04 2022-03-04 中国石油天然气集团有限公司 Manufacturing method of tee joint
CN114131226B (en) * 2020-09-04 2023-08-22 中国石油天然气集团有限公司 Manufacturing method of tee joint
CN112780849A (en) * 2021-01-05 2021-05-11 中国石油大学(北京) Unequal wall thickness pipeline with internal transition section and design method

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